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Earthquake
Precursor
Research



©GeoSeismic Labs 2007.

Supplement to Volume 7
Issue No. 4.3

GeoSeismic Labs Reports: April 2007

All forecasts are based upon Quantitative Analysis using Empirical Methods. Any information related to a forecast expressed by GeoSeismic Labs is considered a test of a hypothesis, and experimental in nature.
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April 22-30, 2007

A Weekly Compilation of Reviewed Infrasonic
Spectrograms & Associated Information
from Public Sources

Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico

29 APR 2007 (119)

ot = 12:41:58.21 +/- 0.40 ANDREANOF ISLANDS, ALEUTIAN IS.
lat = 52.079 +/- 3.1
lon = -179.979 +/- 1.9 MAGNITUDE 6.2 (GS)
dep = 123.3 +/- 3.7

35 km (20 miles) ENE of Semisopochnoi Island, Alaska (pop < 100)
105 km (65 miles) E of Little Sitkin Island, Alaska (pop < 100)
2085 km (1290 miles) WSW of Anchorage, Alaska
2925 km (1820 miles) W of JUNEAU, Alaska

Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico

April 28, 2007: Peak Crustal Resonant Frequency = 0.13 Hz (-64.61 dBv)

28 APR 2007 (118)

ot = 13:56:37.42 +/- 0.51 GUERRERO, MEXICO
lat = 17.207 +/- 6.6
lon = -99.599 +/- 4.5 MAGNITUDE 4.9 (GS)
dep = 34.6 (depth phases)

40 km (25 miles) SSW of Chilpancingo, Guerrero, Mexico (pop 142,000)
50 km (30 miles) NE of Acapulco, Guerrero, Mexico (pop 619,000)
125 km (80 miles) S of Iguala, Guerrero, Mexico (pop 104,000)
250 km (155 miles) S of MEXICO CITY, D.F., Mexico

28 APR 2007 (118)

ot = 14:02:38.04 +/- 0.23 EAST OF SOUTH SANDWICH ISLANDS
lat = -60.684 +/- 9.5
lon = -20.180 +/- 7.1 MAGNITUDE 6.0 (GCMT)
dep = 10.0 (geophysicist)

400 km (250 miles) ESE of Bristol Island, South Sandwich Islands
605 km (375 miles) SE of Visokoi Island, South Sandwich Islands
3285 km (2040 miles) N of South Pole, Antarctica

Magnitude 3.3 - local magnitude (ML)
Time Saturday, April 28, 2007 at 7:55:17 AM (PDT)
Saturday, April 28, 2007 at 14:55:17 (UTC)
Distance from Julian, CA - 8 km (5 miles) E (87 degrees)
Borrego Springs, CA - 23 km (14 miles) SSW (212 degrees)
Pine Valley, CA - 27 km (17 miles) N (5 degrees)
Escondido, CA - 54 km (34 miles) E (96 degrees)
San Diego, CA - 69 km (43 miles) ENE (61 degrees)

Coordinates 33 deg. 4.5 min. N (33.074N), 116 deg. 29.9 min. W (116.499W)
Depth 11.8 km (7.3 miles)

Event ID# ci14287800

Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico

April 27, 2007: Peak Crustal Resonant Frequency = 0.58 Hz (-66.98 dBv)

Magnitude 3.3 - local magnitude (ML)
Time Saturday, April 28, 2007 at 1:04:56 AM (PDT)
Saturday, April 28, 2007 at 8:04:56 (UTC)
Distance from San Bernardino, CA - 1 km (1 miles) SW (234 degrees)
Colton, CA - 7 km (4 miles) NNE (15 degrees)
Rialto, CA - 8 km (5 miles) E (79 degrees)
Highland, CA - 9 km (6 miles) W (274 degrees)
Los Angeles Civic Center, CA - 87 km (54 miles) E (85 degrees)

Coordinates 34 deg. 7.4 min. N (34.124N), 117 deg. 18.1 min. W (117.302W)
Depth 14.1 km (8.8 miles)

Event ID# ci14287736

Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico

April 25, 2007: Peak Crustal Resonant Frequency = 0.19 Hz (-63.13 dBv)

25 APR 2007 (115)

ot = 13:34:16.37 +/- 1.25 VANUATU
lat = -14.287 +/- 6.2
lon = 166.819 +/- 5.3 MAGNITUDE 6.3 (GS)
dep = 69.3 +/- 11.0

140 km (90 miles) NNW of Luganville, Espiritu Santo, Vanuatu (pop 11,000)
410 km (255 miles) SSE of Lata, Santa Cruz Islands, Solomon Isl.
415 km (255 miles) NNW of PORT-VILA, Efate, Vanuatu
2040 km (1270 miles) NE of BRISBANE, Queensland, Australia

M3.0
Date-Time Wednesday, April 25, 2007 at 13:56:51 (UTC)
= Coordinated Universal Time
Wednesday, April 25, 2007 at 6:56:51 AM
= local time at epicenter

Location 36.136°N, 117.919°W
Depth 2.7 km (1.7 miles)
Region CENTRAL CALIFORNIA
Distances 10 km (6 miles) NNE (15°) from Coso Junction, CA
16 km (10 miles) SSE (153°) from Olancha, CA
23 km (14 miles) SSE (155°) from Cartago, CA
52 km (32 miles) SSE (165°) from Lone Pine, CA
233 km (145 miles) N (7°) from Los Angeles Civic Center, CA

Event ID ci14287308

Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico
Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico

March 31, 2007: Peak Crustal Resonant Frequency = 0.16 Hz (-58.16 dBv)

Editors Note:
The M8.1 earthquake occurred one hour after local sunrise, and two hours after the arrival of the Full Moon.
At a time when there was maximum lunar-tidal phase angle, and increasing solar induced stress.

U.S. Naval Observatory
Astronomical Applications Department

Sun and Moon Data for One Day
The following information is provided for M8.1 Solomon Islands (longitude E156.9, latitude S8.4):

Monday
2 April 2007 Universal Time

SUN
Begin civil twilight 19:15 on preceding day
Sunrise 19:35 on preceding day
Sun transit 01:36
Sunset 07:36
End civil twilight 07:57

MOON
Moonset 18:58 on preceding day
Moonrise 07:14
Moon transit 13:26
Moonset 19:40
Moonrise 07:50 on following day

Full Moon on 2 April 2007 at 17:15 Universal Time.

1 APR 2007 ( 91)

ot = 20:39:56.06 +/- 0.24 SOLOMON ISLANDS
lat = -8.481 +/- 6.7
lon = 156.978 +/- 5.2 MAGNITUDE 8.1 (GCMT)
dep = 10.0 (geophysicist)

45 km (30 miles) SSE of Gizo, New Georgia Islands, Solomon Isl. (pop 3,000)
205 km (125 miles) S of Chirovanga, Choiseul, Solomon Islands
345 km (215 miles) WNW of HONIARA, Guadalcanal, Solomon Islands
2145 km (1330 miles) NNE of BRISBANE, Queensland, Australia

At least 13 people killed, an undetermined number missing and
several villages destroyed by the earthquake and tsunami. About
300 homes, schools and a hospital were destroyed at Sasamunga and
about 500 houses were damaged at Gizo. Tsunami damage also
occurred on Lefung and Taro. Felt at Honiara. The tsunami also
caused damage on Rossel Island and Bougainville, Papua New Guinea.

Graphic:(AE)Infrasonic Spectrogram

Strong Infrasonic Resonant Harmonic Energy which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in California, Nevada, and Baja Mexico

April 1, 2007: Peak Crustal Resonant Frequency = 0.59 Hz (-66.14 dBv)

120 Day Peak Crustal Resonant Frequency Chart

The 24 hour (Daily) Peak Resonant Infrasonic Resonant Harmonic Frequency. Since Late October 2006, a significant trend has developed within the Fundamental Harmonic Energy which indicates a Major Crustal Stress Point now exists in the Gulf of California Baja, Mexico.

Acoustic Emissions Catalog Table of Contents



Strong Global Earthquakes

Pacific Plate's Stress Center Related Earthquakes

North American Earthquakes of Special Interest

California, Nevada, and Baja Mexico Earthquakes

North American Micro Quakes of Special Interest





Southern California Seismic Alert: San Jacinto Fault Zone

The Loma Linda Fault is an Active Splay of the San Jacinto Fault Zone, which has been obscured for many years by urban expansion & land development.

Note: The Anza Seismic Gap is a locked segment along the Southern San Jacinto Fault Zone from Anza and Southeast to Coyote Mountain. Micro quake activity within the gap is mainly constrained to two high stress regions concentrated at both ends of the asperity, and only at a depth of 15 km in the seismogenic zone, which is right above the upper limit of aseismic slip.

Contributions Made to GeoSeismic Labs

To keep the flow of this important information & data ongoing to you, I personally never accept Government Grants, or Funding for this project. Only small contributions from Individuals and sponsers who are supporters of this work will be accepted by GeoSeismic Labs, which is a State Registered Non-Profit Public Benefit Corporation since 2001.

Useful Links & Other Related Sources of Information

Graphic:(AE)Unclamping Level Chart Caption:The inferred Mean Average Unclamping Incident Level Observed from
the Pacific-North American Plate Boundary in Southern California.
Major Global Earthquakes have been Preceded by abrupt increases in the
Unclamping Incident Level, as observed during   December 2004,
  October 2005.   September 2006, and most recently   April 2007.

The Pacific Plate is inferred to have transmitted the changes observed here from a large increase in lithospheric stress along the Sunda Trench, and the Eurasian Plate. The inference was first made after the M9.2 Great Sumatra Earthquake, which was preceded by an abrupt increase in the local Unclamping Incident Level. Since then, I've experimentally utilized the Unclamping Incident Level as a means for monitoring global tectonic stress levels, with quite excellent results.

- Frank Condon
Graphic:(Map)Tectonic Plates Caption: Global Tectonic Plates and Volcanoes

My philosophy, quite simply stated is:

The Plate Boundary including the western edge of the ECSZ is the
interface for the transmission of Infrasonic, or AE. Secondary faults
are the handshake lines, which handle the nucleation of the stress. The data lines are the harmonics, which indicate the severity and the approximate lattitude of the location by having a different amplitude and frequency for each of the specific harmonics in the infrasound spectrum. I monitor and record these frequencies, and analyze the results, which allows me to publish a specific forecast of the current regional lithospheric stress level. It's not magic, just good old fashioned hard work while conducting an analysis. I believe these infrasonic signals are the same ones, which enable many pets, wild animals, and humans to sense an increase in the level of stress before an earthquake happens. Also, I utilize the Spring Tides, Lunar Phases and Solar Activity level in my forecasts.

-Frank Condon
Independent Earthquake Precursor Research Consultant
NOTE: A more detailed version is available
as my  Statement Summary.

Graphic:Global 60 Day (AE)Unclamping Incident Chart

Graphic:Regional 60 Day (AE)Unclamping Incident Chart

Graphic:Global 60 Day (AE)Unclamping Incident Chart

Graphic:Regional 60 Day (AE)Unclamping Incident Chart

13 JAN 2007 ( 13)

ot = 04:23:20.96 +/- 0.14 EAST OF KURIL ISLANDS
lat = 46.288 +/- 3.5
lon = 154.448 +/- 2.6 MAGNITUDE 8.2 (GS)
dep = 10.0 (geophysicist)

505 km (315 miles) SSW of Severo-Kuril'sk, Kuril Islands, Russia
525 km (325 miles) ENE of Kuril'sk, Kuril Islands
1710 km (1060 miles) NE of TOKYO, Japan
7260 km (4510 miles) NE of MOSCOW, Russia

 Graphic:Regional 60 Day (AE)Unclamping Incident Chart

21 JAN 2007 ( 21)

ot = 11:27:43.21 +/- 0.18 MOLUCCA SEA
lat = 1.240 +/- 4.7
lon = 126.403 +/- 5.1 MAGNITUDE 7.5 (GCMT)
dep = 10.0 (geophysicist)

120 km (75 miles) WNW of Ternate, Moluccas, Indonesia (pop 83,000)
175 km (110 miles) E of Manado, Sulawesi, Indonesia
1590 km (990 miles) SSE of MANILA, Philippines
2325 km (1450 miles) ENE of JAKARTA, Java, Indonesia

Felt (V) at Manado, Indonesia. Also felt at Bitung, Indonesia.

Daily Infrasonic Spectrograms

April 22, 2007

24 Hour Peak Crustal Resonant Frequency = 0.62 Hz (-66.83 dBv)

00:00-03:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.8 2007/04/22 02:51:55 39.477 -123.107 4.6 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.1 2007/04/22 02:31:18 32.667 -116.058 9.8 10 km ( 6 mi) SW of Ocotillo, CA
ML1.5 2007/04/22 02:24:33 35.185 -117.811 0.0 6 km ( 4 mi) ENE of California City, CA
ML2.7 2007/04/22 01:47:55 34.279 -118.461 12.5 2 km ( 1 mi) WSW of Pacoima, CA
ML1.9 2007/04/22 01:42:53 34.270 -118.466 14.8 3 km ( 2 mi) WSW of Pacoima, CA
ML1.8 2007/04/22 01:41:22 34.266 -118.472 14.3 3 km ( 2 mi) ESE of Granada Hills, CA
ML2.0 2007/04/22 01:36:18 34.265 -118.458 11.2 3 km ( 2 mi) SW of Pacoima, CA
ML1.3 2007/04/22 01:16:54 34.027 -116.763 0.2 10 km ( 6 mi) SE of Mt. San Gorgonio, CA
ML1.7 2007/04/22 01:11:14 38.795 -122.804 3.9 0 km ( 0 mi) SSE of The Geysers, CA
ML1.4 2007/04/22 00:53:45 33.235 -115.936 9.8 7 km ( 5 mi) SSE of Salton City, CA
ML2.3 2007/04/22 00:50:56 32.688 -116.057 9.0 8 km ( 5 mi) SW of Ocotillo, CA
ML1.3 2007/04/22 00:36:42 35.627 -117.586 8.2 8 km ( 5 mi) E of Ridgecrest, CA

03:00 - 06:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.3 2007/04/22 04:42:24 34.275 -118.484 14.6 2 km ( 1 mi) E of Granada Hills, CA

06:00-09:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.4 2007/04/22 08:56:58 -20.557 -68.153 179.2 POTOSI, BOLIVIA

ML1.7 2007/04/22 08:48:07 34.260 -117.192 5.3 0 km ( 0 mi) N of Lake Arrowhead, CA
ML1.3 2007/04/22 08:01:34 38.809 -122.787 0.3 2 km ( 1 mi) ENE of The Geysers, CA
ML1.2 2007/04/22 07:45:15 33.458 -116.577 13.1 14 km ( 9 mi) SE of Anza, CA
ML1.8 2007/04/22 07:44:18 39.586 -123.368 4.5 14 km ( 9 mi) SE of Laytonville, CA
ML2.1 2007/04/22 07:26:12 39.484 -123.110 4.2 16 km ( 10 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/22 07:18:29 38.419 -119.356 9.7 21 km ( 13 mi) NNW of Bridgeport, CA
ML1.1 2007/04/22 07:04:12 36.070 -117.715 5.0 21 km ( 13 mi) E of Coso Junction, CA
ML1.5 2007/04/22 06:34:10 36.953 -121.499 15.1 10 km ( 6 mi) SE of Gilroy, CA
ML1.7 2007/04/22 06:28:33 32.241 -115.740 6.0 52 km ( 33 mi) SSW of Mexicali, Mexico

M4.9 2007/04/22 06:05:29 -31.522 -71.793 29.9 OFFSHORE COQUIMBO, CHILE

09:00-12:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.9 2007/04/22 11:57:42 40.390 -123.995 28.5 15 km ( 10 mi) SE of Rio Dell, CA

M5.1 2007/04/22 11:57:41 -3.743 -81.197 38.2 NEAR THE COAST OF NORTHERN PERU

ML2.4 2007/04/22 11:40:16 31.768 -115.623 6.0 41 km ( 26 mi) NNE of Lázaro Cárdenas, Mexico

M5.0 2007/04/22 10:28:52 25.632 125.171 10.0 SOUTHWESTERN RYUKYU ISLANDS, JAPAN
M5.3 2007/04/22 10:22:06 -32.382 -71.257 39.0 VALPARAISO, CHILE

ML1.6 2007/04/22 09:48:37 32.742 -116.117 8.9 11 km ( 7 mi) W of Ocotillo, CA
ML1.5 2007/04/22 09:48:34 32.682 -116.042 10.6 8 km ( 5 mi) SW of Ocotillo, CA
ML1.1 2007/04/22 09:14:15 33.316 -116.328 14.6 9 km ( 5 mi) NNE of Borrego Springs, CA

12:00-15:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.1 2007/04/22 14:22:12 38.828 -122.809 3.8 3 km ( 2 mi) N of The Geysers, CA
ML1.3 2007/04/22 14:10:02 37.487 -118.844 9.1 17 km ( 10 mi) WSW of Toms Place, CA
ML1.3 2007/04/22 14:09:41 33.302 -116.875 16.6 6 km ( 4 mi) S of Palomar Observatory, CA
ML1.7 2007/04/22 14:08:23 33.507 -116.497 13.4 17 km ( 11 mi) ESE of Anza, CA

M4.7 2007/04/22 13:40:58 -6.466 146.314 118.0 EASTERN NEW GUINEA REG, PAPUA NEW GUINEA

ML1.7 2007/04/22 13:17:55 33.459 -116.572 13.1 14 km ( 9 mi) SE of Anza, CA
ML1.3 2007/04/22 13:16:50 37.433 -117.053 0.0 23 km ( 15 mi) NE of Tokop, NV
ML1.6 2007/04/22 13:16:21 33.184 -116.028 6.2 11 km ( 7 mi) ENE of Ocotillo Wells, CA
ML1.0 2007/04/22 13:13:19 35.475 -118.467 5.6 18 km ( 11 mi) S of town of Lake Isabella, CA
ML1.9 2007/04/22 13:01:20 32.694 -116.059 9.5 8 km ( 5 mi) SW of Ocotillo, CA
ML1.8 2007/04/22 12:57:39 37.969 -118.759 9.8 32 km ( 20 mi) E of Lee Vining, CA

M4.5 2007/04/22 12:23:43 53.650 -35.563 10.0 REYKJANES RIDGE

ML1.1 2007/04/22 12:22:42 33.978 -116.753 6.0 8 km ( 5 mi) N of Cabazon, CA
ML1.4 2007/04/22 12:17:50 33.874 -117.717 11.3 7 km ( 4 mi) ESE of Yorba Linda, CA

15:00-18:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.3 2007/04/22 17:48:51 2.093 96.618 30.0 SIMEULUE, INDONESIA

ML4.9 2007/04/22 17:34:44 54.577 -161.112 40.7 ALASKA PENINSULA

ML2.0 2007/04/22 17:34:31 39.465 -123.109 3.6 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.4 2007/04/22 17:27:23 32.126 -115.853 8.0 69 km ( 43 mi) SSW of Mexicali, Mexico
ML1.3 2007/04/22 17:24:01 32.631 -116.044 10.3 13 km ( 8 mi) SSW of Ocotillo, CA
ML1.6 2007/04/22 16:30:33 32.699 -116.056 9.0 7 km ( 4 mi) SW of Ocotillo, CA
ML1.4 2007/04/22 16:03:41 38.787 -122.772 2.2 3 km ( 2 mi) ESE of The Geysers, CA
ML1.4 2007/04/22 15:23:41 32.692 -116.054 6.5 7 km ( 5 mi) SW of Ocotillo, CA
ML1.5 2007/04/22 15:01:16 32.680 -116.035 9.0 8 km ( 5 mi) SSW of Ocotillo, CA

18:00-21:00 UTC

Return to Table of Contents
Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.1 2007/04/22 20:39:05 36.745 -121.336 8.3 5 km ( 3 mi) SSW of Tres Pinos, CA

ML3.1 2007/04/22 20:10:01 39.480 -123.107 7.0 15 km ( 9 mi) WNW of Lake Pillsbury, CA

ML1.7 2007/04/22 18:09:26 33.142 -117.364 16.9 7 km ( 4 mi) WNW of Carlsbad, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M5.2 2007/04/22 23:56:47 48.124 152.376 35.0 KURIL ISLANDS

ML1.3 2007/04/22 23:13:48 32.688 -116.039 10.9 7 km ( 4 mi) SW of Ocotillo, CA
ML1.9 2007/04/22 23:09:12 34.738 -119.058 10.7 14 km ( 9 mi) SW of Frazier Park, CA
ML1.0 2007/04/22 22:48:26 33.864 -116.841 14.9 9 km ( 5 mi) SW of Cabazon, CA
ML1.0 2007/04/22 21:59:06 34.081 -117.505 7.4 5 km ( 3 mi) WSW of Fontana, CA
ML2.0 2007/04/22 21:48:35 37.382 -121.737 7.4 8 km ( 5 mi) E of Alum Rock, CA
ML1.1 2007/04/22 21:15:50 33.419 -116.599 16.5 17 km ( 10 mi) SSE of Anza, CA

April 23, 2007

24 Hour Peak Crustal Resonant Frequency = 0.53 Hz (-66.46 dBv)

00:00-03:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.1 2007/04/23 02:00:38 37.600 -118.823 11.8 13 km ( 8 mi) WNW of Toms Place, CA
ML1.5 2007/04/23 01:42:39 37.476 -118.838 3.1 17 km ( 10 mi) SW of Toms Place, CA
ML1.2 2007/04/23 01:41:24 36.129 -117.908 6.6 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.1 2007/04/23 01:10:43 33.495 -116.495 14.7 18 km ( 11 mi) ESE of Anza, CA
ML1.3 2007/04/23 00:38:25 35.045 -117.673 0.0 4 km ( 2 mi) NNW of Boron, CA
ML1.4 2007/04/23 00:28:34 33.752 -116.033 7.0 15 km ( 10 mi) ENE of Coachella, CA

03:00 - 06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/23 05:49:29 39.448 -123.107 0.9 14 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/23 05:32:33 32.703 -116.045 8.5 6 km ( 4 mi) SW of Ocotillo, CA
ML1.0 2007/04/23 05:14:23 33.594 -116.817 14.9 14 km ( 9 mi) WNW of Anza, CA

M5.0 2007/04/23 05:13:54 -6.814 129.794 122.1 BANDA SEA

ML1.6 2007/04/23 05:12:50 41.260 -122.167 5.0 3 km ( 2 mi) WNW of McCloud, CA
ML2.0 2007/04/23 05:09:26 33.580 -116.824 14.2 14 km ( 9 mi) W of Anza, CA
ML1.1 2007/04/23 04:59:30 37.602 -118.785 7.7 10 km ( 6 mi) WNW of Toms Place, CA

ML3.1 2007/04/23 04:08:57 34.216 -119.928 6.0 23 km ( 14 mi) SSW of Isla Vista, CA

ML1.4 2007/04/23 04:06:02 32.705 -116.043 3.7 6 km ( 4 mi) SW of Ocotillo, CA
ML1.4 2007/04/23 03:59:19 37.478 -118.843 9.0 17 km ( 11 mi) WSW of Toms Place, CA
ML1.7 2007/04/23 03:41:32 32.932 -116.450 14.0 14 km ( 8 mi) NNE of Pine Valley, CA
ML1.0 2007/04/23 03:35:15 34.031 -116.755 9.8 10 km ( 6 mi) SE of Mt. San Gorgonio, CA

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.9 2007/04/23 07:28:30 33.167 -116.050 4.0 8 km ( 5 mi) ENE of Ocotillo Wells, CA
ML1.4 2007/04/23 07:27:48 36.725 -121.359 5.7 8 km ( 5 mi) SSW of Tres Pinos, CA
ML1.2 2007/04/23 07:19:12 38.810 -122.789 0.8 2 km ( 1 mi) NE of The Geysers, CA

M4.8 2007/04/23 07:02:59 -21.242 -174.460 35.0 TONGA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.0 2007/04/23 11:37:53 34.503 -118.108 14.5 8 km ( 5 mi) ENE of Acton, CA
ML1.8 2007/04/23 10:54:04 40.204 -118.799 8.0 28 km ( 17 mi) W of Lovelock, NV
ML1.8 2007/04/23 10:52:38 34.254 -117.138 3.6 5 km ( 3 mi) E of Lake Arrowhead, CA
ML1.3 2007/04/23 10:49:36 36.139 -117.912 2.1 11 km ( 7 mi) NNE of Coso Junction, CA
ML1.5 2007/04/23 10:02:10 33.351 -116.238 14.5 17 km ( 11 mi) NE of Borrego Springs, CA

M5.1 2007/04/23 09:45:25 -20.599 169.247 83.0 VANUATU

ML1.4 2007/04/23 09:34:44 38.806 -122.738 2.9 3 km ( 2 mi) SSW of Cobb, CA
ML1.4 2007/04/23 09:11:35 32.690 -116.046 10.2 7 km ( 4 mi) SW of Ocotillo, CA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.8 2007/04/23 14:35:25 38.535 -122.770 3.6 3 km ( 2 mi) NNW of Larkfield-Wikiup, CA
ML1.6 2007/04/23 14:34:58 32.687 -116.042 10.3 7 km ( 4 mi) SW of Ocotillo, CA
ML1.0 2007/04/23 14:16:22 38.866 -122.785 1.9 6 km ( 4 mi) WNW of Cobb, CA
ML1.2 2007/04/23 13:37:37 35.989 -120.553 2.6 15 km ( 9 mi) NW of Parkfield, CA
ML2.3 2007/04/23 13:28:32 38.832 -122.763 0.0 4 km ( 2 mi) W of Cobb, CA
ML1.6 2007/04/23 12:59:05 34.845 -116.325 4.5 20 km ( 13 mi) NW of Ludlow, CA

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.2 2007/04/23 17:59:11 36.065 -115.507 8.0 5 km ( 3 mi) N of Mountain Springs, NV
ML2.1 2007/04/23 17:02:53 39.584 -123.347 0.8 16 km ( 10 mi) SE of Laytonville, CA
ML1.0 2007/04/23 16:54:06 33.677 -116.796 17.4 11 km ( 7 mi) SW of Idyllwild, CA
ML1.7 2007/04/23 16:27:57 35.709 -117.487 12.2 11 km ( 7 mi) SW of Searles Valley, CA
ML1.0 2007/04/23 16:16:58 37.601 -118.786 7.7 10 km ( 6 mi) WNW of Toms Place, CA

ML3.0 2007/04/23 16:11:25 41.178 -120.382 0.4 12 km ( 7 mi) ESE of Likely, CA

ML2.0 2007/04/23 16:01:47 32.315 -116.351 14.1 39 km ( 24 mi) SE of Tecate, Mexico
ML1.6 2007/04/23 15:13:00 33.353 -116.376 12.8 12 km ( 7 mi) N of Borrego Springs, CA
ML1.5 2007/04/23 15:09:35 32.690 -116.046 10.2 7 km ( 4 mi) SW of Ocotillo, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.0 2007/04/23 20:52:44 33.690 -116.804 17.4 10 km ( 6 mi) SW of Idyllwild, CA
ML1.5 2007/04/23 20:32:46 39.487 -123.107 4.0 15 km ( 10 mi) NW of Lake Pillsbury, CA
ML1.1 2007/04/23 19:35:53 34.303 -118.513 5.0 4 km ( 2 mi) NNW of Granada Hills, CA
ML1.7 2007/04/23 19:32:46 34.270 -118.479 16.6 2 km ( 1 mi) E of Granada Hills, CA

ML3.1 2007/04/23 19:30:49 34.288 -118.475 12.9 3 km ( 2 mi) NE of Granada Hills, CA

ML1.9 2007/04/23 19:01:35 32.555 -116.788 0.0 15 km ( 9 mi) W of Tecate, Mexico
ML1.8 2007/04/23 18:59:11 36.557 -121.153 7.3 3 km ( 2 mi) NNW of Pinnacles, CA
ML1.7 2007/04/23 18:58:26 40.648 -121.781 10.2 17 km ( 11 mi) NNW of Viola, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.6 2007/04/23 23:36:51 34.573 -116.252 3.9 19 km ( 12 mi) SSW of Ludlow, CA
ML1.0 2007/04/23 23:17:35 33.497 -116.503 17.1 17 km ( 11 mi) ESE of Anza, CA

M4.7 2007/04/23 22:59:27 29.055 -43.099 10.0 NORTHERN MID-ATLANTIC RIDGE

ML2.8 2007/04/23 22:41:11 34.026 -116.766 5.1 10 km ( 6 mi) SE of Mt. San Gorgonio, CA
ML1.5 2007/04/23 22:33:08 38.822 -122.792 3.1 3 km ( 2 mi) NNE of The Geysers, CA
ML1.2 2007/04/23 22:00:24 38.867 -122.789 2.3 7 km ( 4 mi) WNW of Cobb, CA
ML2.1 2007/04/23 21:33:42 33.259 -116.140 0.1 13 km ( 8 mi) N of Ocotillo Wells, CA
ML1.1 2007/04/23 21:27:43 35.409 -120.884 21.2 3 km ( 2 mi) S of Cayucos, CA
ML1.7 2007/04/23 21:05:51 32.685 -116.040 10.6 7 km ( 5 mi) SW of Ocotillo, CA

April 24, 2007

24 Hour Peak Crustal Resonant Frequency = 0.53 Hz (-66.61 dBv)

00:00-03:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/24 02:49:25 33.299 -116.212 5.7 16 km ( 10 mi) ENE of Borrego Springs, CA
ML1.2 2007/04/24 02:39:10 33.873 -116.855 15.7 8 km ( 5 mi) SSE of Banning, CA
ML2.0 2007/04/24 02:25:00 33.295 -116.212 4.5 16 km ( 10 mi) ENE of Borrego Springs, CA

M4.8 2007/04/24 02:24:08 30.801 141.850 40.2 IZU ISLANDS, JAPAN REGION

ML2.0 2007/04/24 02:22:34 39.427 -123.101 2.4 12 km ( 8 mi) W of Lake Pillsbury, CA

ML4.3 2007/04/24 02:07:01 50.308 -130.033 35.0 344 km (214 mi) W of Campbell River, Canada

ML1.5 2007/04/24 01:25:09 38.425 -119.360 9.8 22 km ( 14 mi) NNW of Bridgeport, CA

M4.6 2007/04/24 00:25:26 29.294 -43.044 10.0 NORTHERN MID-ATLANTIC RIDGE
M4.8 2007/04/24 00:14:13 29.221 -43.280 10.0 NORTHERN MID-ATLANTIC RIDGE

03:00 - 06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M5.0 2007/04/24 05:56:34 29.220 -43.218 10.0 NORTHERN MID-ATLANTIC RIDGE

ML3.6 2007/04/24 04:33:09 44.407 -116.151 10.0 15 km ( 9 mi) SW of Cascade, ID

ML1.1 2007/04/24 04:25:59 36.675 -121.300 5.0 13 km ( 8 mi) S of Tres Pinos, CA
ML1.4 2007/04/24 03:31:40 38.782 -122.722 1.3 3 km ( 2 mi) WNW of Anderson Springs, CA
ML1.5 2007/04/24 03:08:24 38.773 -122.745 1.7 5 km ( 3 mi) W of Anderson Springs, CA

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M5.3 2007/04/24 08:53:34 5.656 -75.947 54.7 COLOMBIA
M4.9 2007/04/24 08:24:42 48.292 154.673 10.0 KURIL ISLANDS

ML1.2 2007/04/24 08:18:11 33.659 -116.715 16.1 10 km ( 6 mi) S of Idyllwild, CA

ML3.0 2007/04/24 08:00:00 19.387 -65.112 47.8 111 km ( 69 mi) NW of Settlement, British Virgin Islands

M5.0 2007/04/24 07:36:59 29.195 -43.223 10.0 NORTHERN MID-ATLANTIC RIDGE
M4.9 2007/04/24 07:25:45 29.147 -43.304 10.0 NORTHERN MID-ATLANTIC RIDGE
M4.8 2007/04/24 07:20:02 36.488 71.463 47.8 HINDU KUSH REGION, AFGHANISTAN
M4.8 2007/04/24 07:06:25 29.412 -43.175 10.0 NORTHERN MID-ATLANTIC RIDGE

ML1.1 2007/04/24 06:48:13 37.878 -122.257 9.4 2 km ( 1 mi) ENE of Berkeley, CA
ML1.3 2007/04/24 06:43:40 33.494 -116.537 11.4 14 km ( 9 mi) ESE of Anza, CA
ML1.7 2007/04/24 06:32:44 33.864 -117.103 11.0 4 km ( 2 mi) NNE of Lakeview, CA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.3 2007/04/24 11:21:00 37.656 -117.329 0.0 9 km ( 6 mi) SW of West Spring, NV
ML2.5 2007/04/24 11:20:43 38.261 -118.326 7.0 18 km ( 11 mi) ESE of Qualeys Camp, NV
ML1.7 2007/04/24 10:55:35 33.322 -116.261 7.0 13 km ( 8 mi) NE of Borrego Springs, CA
ML1.3 2007/04/24 10:40:08 34.316 -116.467 4.5 22 km ( 13 mi) NNW of Yucca Valley, CA
ML1.4 2007/04/24 10:25:43 36.069 -117.916 6.5 4 km ( 2 mi) NE of Coso Junction, CA
ML1.8 2007/04/24 10:13:46 39.428 -123.104 0.0 13 km ( 8 mi) W of Lake Pillsbury, CA
ML1.5 2007/04/24 09:26:45 34.493 -118.068 10.7 8 km ( 5 mi) WSW of Littlerock, CA
ML1.1 2007/04/24 09:20:27 33.671 -116.753 13.6 9 km ( 6 mi) SSW of Idyllwild, CA
ML2.1 2007/04/24 09:11:51 34.564 -116.531 1.0 38 km ( 24 mi) WSW of Ludlow, CA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.6 2007/04/24 14:45:23 36.569 -121.162 3.5 4 km ( 3 mi) NNW of Pinnacles, CA
ML1.7 2007/04/24 14:10:23 32.689 -116.039 10.7 7 km ( 4 mi) SW of Ocotillo, CA

ML3.3 2007/04/24 13:38:41 19.271 -65.444 34.2 103 km ( 64 mi) NNE of Vieques, PR

ML3.2 2007/04/24 13:30:06 32.366 -115.098 6.0 9 km ( 5 mi) N of Guadalupe Victoria, Mexico

M5.5 2007/04/24 12:14:23 -7.757 155.619 10.0 SOLOMON ISLANDS

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.4 2007/04/24 17:39:19 33.985 -117.177 17.7 8 km ( 5 mi) S of Redlands, CA
ML1.7 2007/04/24 17:35:33 38.819 -122.833 2.2 3 km ( 2 mi) NW of The Geysers, CA
ML1.2 2007/04/24 17:25:00 35.625 -117.506 3.8 15 km ( 10 mi) E of Ridgecrest, CA
ML1.2 2007/04/24 17:21:00 32.684 -116.040 12.1 7 km ( 5 mi) SW of Ocotillo, CA
ML1.6 2007/04/24 16:44:17 33.939 -116.797 6.5 4 km ( 3 mi) NW of Cabazon, CA
ML1.4 2007/04/24 16:31:28 38.755 -122.944 0.0 8 km ( 5 mi) SE of Cloverdale, CA
ML2.0 2007/04/24 16:25:40 33.956 -117.960 9.0 1 km ( 1 mi) SW of La Habra Heights, CA
ML1.8 2007/04/24 16:21:21 33.291 -116.169 10.0 17 km ( 10 mi) NNW of Ocotillo Wells, CA
ML1.8 2007/04/24 16:12:40 39.488 -123.112 3.3 16 km ( 10 mi) NW of Lake Pillsbury, CA

M5.3 2007/04/24 16:07:40 29.028 -43.136 10.0 NORTHERN MID-ATLANTIC RIDGE

ML1.5 2007/04/24 16:05:26 32.701 -116.038 9.0 6 km ( 4 mi) SW of Ocotillo, CA
ML1.8 2007/04/24 15:50:21 32.691 -116.054 9.1 8 km ( 5 mi) SW of Ocotillo, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.5 2007/04/24 20:53:23 -27.087 66.970 10.0 INDIAN OCEAN TRIPLE JUNCTION

ML2.6 2007/04/24 20:38:34 36.764 -121.729 6.3 2 km ( 1 mi) E of Castroville, CA
ML1.1 2007/04/24 20:23:52 32.691 -116.044 10.2 7 km ( 4 mi) SW of Ocotillo, CA
ML1.3 2007/04/24 20:11:49 32.696 -116.044 9.9 7 km ( 4 mi) SW of Ocotillo, CA
ML2.4 2007/04/24 19:53:56 36.861 -121.416 5.8 2 km ( 1 mi) NW of Hollister, CA
ML1.5 2007/04/24 19:41:11 33.181 -115.633 0.0 1 km ( 1 mi) NNE of Obsidian Butte, CA
ML1.4 2007/04/24 19:28:36 36.159 -120.293 7.4 6 km ( 4 mi) ENE of Coalinga, CA

ML3.4 2007/04/24 18:41:46 18.703 -65.122 95.6 44 km ( 27 mi) NNW of CHARLOTTE AMALIE, US Virgin Islands

M4.8 2007/04/24 18:21:13 -16.404 67.211 10.0 MID-INDIAN RIDGE

ML1.6 2007/04/24 18:20:44 34.423 -116.192 6.6 22 km ( 13 mi) NNW of Twentynine Palms Base, CA
ML2.0 2007/04/24 18:08:07 36.385 -120.956 1.9 23 km ( 15 mi) SE of Pinnacles, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.7 2007/04/24 23:56:16 37.073 -114.919 0.0 28 km ( 17 mi) WNW of Hoya, NV
ML1.6 2007/04/24 23:45:48 35.037 -117.678 0.0 3 km ( 2 mi) NNW of Boron, CA
ML1.0 2007/04/24 23:14:39 36.038 -117.720 0.5 21 km ( 13 mi) E of Coso Junction, CA

M4.9 2007/04/24 22:47:18 29.701 -43.670 10.0 NORTHERN MID-ATLANTIC RIDGE

ML3.0 2007/04/24 22:32:09 39.449 -123.105 0.1 13 km ( 8 mi) WNW of Lake Pillsbury, CA

ML1.8 2007/04/24 21:56:23 38.797 -122.799 1.5 1 km ( 0 mi) ESE of The Geysers, CA
ML1.4 2007/04/24 21:55:14 38.807 -122.801 3.1 1 km ( 1 mi) NNE of The Geysers, CA

M4.2 2007/04/24 21:44:41 -16.472 -74.170 56.1 NEAR THE COAST OF SOUTHERN PERU

ML1.6 2007/04/24 21:38:28 38.812 -122.812 3.7 2 km ( 1 mi) NNW of The Geysers, CA
ML2.5 2007/04/24 21:35:16 38.817 -122.790 2.4 3 km ( 2 mi) NE of The Geysers, CA
ML1.6 2007/04/24 21:32:01 38.806 -122.789 1.6 2 km ( 1 mi) ENE of The Geysers, CA
ML1.1 2007/04/24 21:14:15 38.782 -122.745 1.3 5 km ( 3 mi) W of Anderson Springs, CA
ML1.7 2007/04/24 21:11:43 38.799 -122.775 0.0 3 km ( 2 mi) E of The Geysers, CA
ML1.6 2007/04/24 21:11:10 38.808 -122.806 4.5 1 km ( 1 mi) N of The Geysers, CA

ML4.4 2007/04/24 21:08:28 38.796 -122.794 1.7 1 km ( 1 mi) ESE of The Geysers, CA

ML1.3 2007/04/24 21:02:11 32.696 -116.040 10.0 6 km ( 4 mi) SW of Ocotillo, CA

April 25, 2007

24 Hour Peak Crustal Resonant Frequency = 0.19 Hz (-63.13 dBv)

00:00-03:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.1 2007/04/25 02:53:32 32.692 -116.037 10.6 6 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/25 02:34:36 38.805 -122.801 2.1 1 km ( 1 mi) NE of The Geysers, CA
ML1.3 2007/04/25 02:32:49 34.006 -116.753 13.5 11 km ( 7 mi) N of Cabazon, CA

M5.0 2007/04/25 02:11:55 47.111 -27.451 10.0 NORTHERN MID-ATLANTIC RIDGE

ML1.2 2007/04/25 02:09:47 32.690 -116.036 10.2 7 km ( 4 mi) SW of Ocotillo, CA
ML1.0 2007/04/25 01:49:38 34.274 -118.474 13.6 3 km ( 2 mi) E of Granada Hills, CA
ML1.5 2007/04/25 01:44:47 32.693 -116.053 10.4 7 km ( 5 mi) SW of Ocotillo, CA
ML2.0 2007/04/25 01:13:42 39.487 -123.110 4.5 16 km ( 10 mi) NW of Lake Pillsbury, CA
ML1.3 2007/04/25 01:07:57 35.926 -120.478 4.5 5 km ( 3 mi) NW of Parkfield, CA
ML1.8 2007/04/25 00:49:37 33.323 -116.360 13.0 8 km ( 5 mi) N of Borrego Springs, CA
ML1.1 2007/04/25 00:30:03 33.788 -116.037 5.6 17 km ( 11 mi) NE of Coachella, CA

03:00 - 06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.8 2007/04/25 05:54:52 39.584 -123.354 9.8 15 km ( 10 mi) SE of Laytonville, CA
ML2.9 2007/04/25 05:49:15 39.578 -123.354 9.3 16 km ( 10 mi) SE of Laytonville, CA
ML2.3 2007/04/25 05:44:16 37.043 -121.480 7.3 10 km ( 6 mi) ENE of Gilroy, CA
ML1.6 2007/04/25 05:31:50 38.803 -122.805 4.2 1 km ( 0 mi) NNE of The Geysers, CA
ML1.6 2007/04/25 05:16:11 34.197 -117.507 10.3 10 km ( 6 mi) WSW of Devore, CA
ML1.9 2007/04/25 04:55:42 34.669 -116.296 3.0 14 km ( 9 mi) WSW of Ludlow, CA
ML1.6 2007/04/25 04:53:04 39.583 -123.351 10.0 16 km ( 10 mi) SE of Laytonville, CA
ML2.0 2007/04/25 04:48:26 39.583 -123.352 9.9 16 km ( 10 mi) SE of Laytonville, CA
ML1.5 2007/04/25 04:21:56 36.066 -117.929 2.8 3 km ( 2 mi) NE of Coso Junction, CA

M5.2 2007/04/25 04:19:00 28.190 56.220 15.9 SOUTHERN IRAN

ML1.2 2007/04/25 04:07:29 34.168 -116.441 11.5 5 km ( 3 mi) NNW of Yucca Valley, CA ML1.5 2007/04/25 03:36:06 35.283 -118.540 5.2 6 km ( 4 mi) NE of Keene, CA
ML2.9 2007/04/25 03:26:56 39.445 -123.103 3.0 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/25 03:25:21 33.364 -116.381 5.6 13 km ( 8 mi) N of Borrego Springs, CA

M5.2 2007/04/25 03:22:47 -15.614 167.724 131.9 VANUATU

ML1.6 2007/04/25 03:18:30 36.074 -117.919 4.0 4 km ( 3 mi) NE of Coso Junction, CA
ML1.9 2007/04/25 03:13:27 39.446 -123.105 3.9 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.2 2007/04/25 03:04:13 38.797 -122.805 3.0 0 km ( 0 mi) SE of The Geysers, CA

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

ML1.1 2007/04/25 08:44:35 32.791 -115.459 16.0 8 km ( 5 mi) WSW of Holtville, CA
ML1.0 2007/04/25 08:43:39 32.794 -115.452 14.2 7 km ( 4 mi) WSW of Holtville, CA
ML1.3 2007/04/25 08:37:47 33.447 -116.715 13.3 13 km ( 8 mi) SSW of Anza, CA
ML1.1 2007/04/25 08:37:24 34.148 -117.469 7.7 6 km ( 4 mi) N of Fontana, CA
ML1.2 2007/04/25 08:24:14 37.486 -118.544 7.7 9 km ( 6 mi) NNE of Round Valley, CA
ML2.5 2007/04/25 08:22:16 36.624 -121.231 8.5 13 km ( 8 mi) NW of Pinnacles, CA
ML1.7 2007/04/25 07:46:54 33.301 -116.210 11.7 16 km ( 10 mi) ENE of Borrego Springs, CA
ML2.0 2007/04/25 07:30:49 32.718 -116.070 7.0 7 km ( 4 mi) WSW of Ocotillo, CA
ML2.3 2007/04/25 06:22:35 32.722 -115.912 11.8 8 km ( 5 mi) ESE of Ocotillo, CA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M5.7 2007/04/25 11:52:57 7.368 126.527 35.0 MINDANAO, PHILIPPINES

ML1.8 2007/04/25 11:36:21 35.255 -118.569 8.2 2 km ( 1 mi) NE of Keene, CA
ML1.6 2007/04/25 11:08:23 35.592 -120.829 7.5 12 km ( 7 mi) WNW of Templeton, CA
ML1.0 2007/04/25 10:46:26 34.146 -117.466 7.1 5 km ( 3 mi) N of Fontana, CA
ML1.9 2007/04/25 10:37:04 36.038 -120.624 0.0 23 km ( 14 mi) NW of Parkfield, CA

ML4.0 2007/04/25 10:36:55 60.926 -150.588 49.6 KENAI PENINSULA, ALASKA

ML1.3 2007/04/25 10:27:36 32.818 -115.461 13.8 8 km ( 5 mi) W of Holtville, CA

M5.0 2007/04/25 10:06:50 46.644 152.551 10.0 KURIL ISLANDS

ML2.5 2007/04/25 09:58:13 38.678 -122.408 6.6 12 km ( 7 mi) NNE of Angwin, CA
ML1.7 2007/04/25 09:50:13 35.678 -121.059 4.8 12 km ( 8 mi) ENE of San Simeon, CA
ML1.3 2007/04/25 09:24:23 35.561 -120.800 3.2 8 km ( 5 mi) W of Templeton, CA
ML1.0 2007/04/25 09:18:31 32.811 -115.450 12.8 7 km ( 4 mi) W of Holtville, CA
ML2.6 2007/04/25 09:15:57 32.775 -115.446 15.6 7 km ( 5 mi) SW of Holtville, CA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.4 2007/04/25 14:09:30 32.759 -115.424 16.9 7 km ( 5 mi) SW of Holtville, CA
ML1.4 2007/04/25 14:05:46 32.769 -115.465 5.0 7 km ( 4 mi) NE of Heber, CA
ML2.1 2007/04/25 14:04:17 32.782 -115.451 16.2 7 km ( 5 mi) WSW of Holtville, CA
ML1.5 2007/04/25 14:01:34 34.465 -116.241 8.4 28 km ( 17 mi) NNW of Twentynine Palms Base, CA

ML3.0 2007/04/25 13:56:51 36.136 -117.919 2.7 10 km ( 6 mi) NNE of Coso Junction, CA

ML3.0 2007/04/25 13:36:09 19.375 -67.439 20.9 107 km ( 66 mi) NNW of Isabela, PR

M6.3 2007/04/25 13:34:16 -14.287 166.819 69.3 VANUATU

ML2.4 2007/04/25 13:28:59 32.622 -117.448 7.0 27 km ( 17 mi) WSW of Coronado, CA
ML2.0 2007/04/25 12:52:48 40.391 -122.197 12.4 7 km ( 4 mi) E of Cottonwood, CA

M4.9 2007/04/25 12:34:30 29.017 -43.088 10.0 NORTHERN MID-ATLANTIC RIDGE

ML1.6 2007/04/25 12:30:59 32.978 -116.459 12.6 16 km ( 10 mi) SE of Julian, CA

ML3.3 2007/04/25 12:08:30 18.057 -68.390 48.3 71 km ( 44 mi) SSE of Higüey, Dominican Republic

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.0 2007/04/25 17:16:08 37.367 -117.103 5.7 16 km ( 10 mi) ENE of Tokop, NV
ML1.0 2007/04/25 17:16:07 37.413 -117.104 16.0 19 km ( 12 mi) NE of Tokop, NV
ML1.9 2007/04/25 17:10:05 32.702 -116.045 8.5 6 km ( 4 mi) SW of Ocotillo, CA
ML1.6 2007/04/25 16:57:59 32.801 -115.462 7.0 8 km ( 5 mi) W of Holtville, CA
ML1.0 2007/04/25 16:51:54 35.499 -118.284 10.0 16 km ( 10 mi) SSE of Weldon, CA

ML3.1 2007/04/25 16:20:47 32.768 -115.441 15.9 8 km ( 5 mi) SW of Holtville, CA

ML1.5 2007/04/25 16:11:28 33.377 -116.888 5.2 3 km ( 2 mi) NW of Palomar Observatory, CA
ML2.1 2007/04/25 16:10:56 32.787 -115.445 17.8 7 km ( 4 mi) WSW of Holtville, CA
ML1.9 2007/04/25 15:33:53 37.950 -122.019 11.0 2 km ( 1 mi) S of Concord, CA
ML1.9 2007/04/25 15:29:09 32.745 -115.414 16.3 8 km ( 5 mi) SSW of Holtville, CA
ML1.1 2007/04/25 15:17:48 36.111 -117.910 7.9 8 km ( 5 mi) NNE of Coso Junction, CA
ML1.7 2007/04/25 15:14:19 34.322 -116.933 0.0 9 km ( 6 mi) NNW of town of Big Bear Lake, CA
ML1.5 2007/04/25 15:12:25 36.129 -117.917 4.5 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.2 2007/04/25 15:11:13 36.127 -117.915 5.4 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.9 2007/04/25 15:06:25 36.133 -117.915 4.6 10 km ( 6 mi) NNE of Coso Junction, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.4 2007/04/25 20:50:02 32.688 -116.041 8.9 7 km ( 4 mi) SW of Ocotillo, CA
ML1.7 2007/04/25 20:16:13 37.481 -118.713 7.7 9 km ( 6 mi) SSW of Toms Place, CA
ML2.2 2007/04/25 20:02:48 39.306 -122.803 5.9 18 km ( 11 mi) SE of Lake Pillsbury, CA

M4.9 2007/04/25 20:02:14 28.168 56.425 10.0 SOUTHERN IRAN

ML1.5 2007/04/25 19:47:35 33.672 -116.755 13.7 9 km ( 6 mi) SSW of Idyllwild, CA
ML1.3 2007/04/25 19:29:57 33.879 -116.855 11.9 7 km ( 4 mi) SE of Banning, CA
ML2.2 2007/04/25 19:28:19 38.697 -117.086 0.0 53 km ( 33 mi) SSE of Washington, NV
ML1.7 2007/04/25 19:22:46 39.448 -123.109 1.3 14 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.7 2007/04/25 19:21:05 36.129 -117.915 4.8 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.1 2007/04/25 19:01:02 34.358 -117.017 0.0 12 km ( 7 mi) SW of Lucerne Valley, CA
ML1.2 2007/04/25 18:28:39 32.688 -116.039 10.7 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/25 18:17:01 36.187 -115.603 0.0 8 km ( 5 mi) SSE of Mount Charleston, NV

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.3 2007/04/25 23:30:06 38.235 -117.042 12.0 25 km ( 15 mi) NE of Tonopah, NV
ML1.4 2007/04/25 21:49:38 36.969 -121.609 3.4 5 km ( 3 mi) SSW of Gilroy, CA
ML1.0 2007/04/25 21:31:55 37.177 -121.968 4.7 3 km ( 2 mi) NNE of Lexington Hills, CA
ML2.3 2007/04/25 21:24:48 40.392 -122.172 11.7 9 km ( 6 mi) E of Cottonwood, CA

April 26, 2007

24 Hour Peak Crustal Resonant Frequency = 0.16 Hz (-62.92 dBv)

00:00-03:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.4 2007/04/26 02:58:12 36.125 -120.331 9.4 3 km ( 2 mi) SE of Coalinga, CA

M4.4 2007/04/26 02:55:20 34.741 135.179 10.0 NEAR S. COAST OF WESTERN HONSHU, JAPAN
M4.4 2007/04/26 02:53:00 -7.252 111.111 100.1 JAVA, INDONESIA

ML1.4 2007/04/26 01:51:27 33.675 -116.753 14.4 9 km ( 5 mi) SSW of Idyllwild, CA
ML2.0 2007/04/26 00:56:10 33.690 -119.213 9.4 52 km ( 32 mi) S of Channel Islands Beach, CA
ML1.7 2007/04/26 00:35:59 38.823 -122.799 3.6 3 km ( 2 mi) NNE of The Geysers, CA
ML2.2 2007/04/26 00:22:58 38.079 -122.240 6.3 3 km ( 2 mi) NNW of Crockett, CA

M5.1 2007/04/26 00:02:58 33.883 133.467 45.0 SHIKOKU, JAPAN

03:00 - 06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.4 2007/04/26 05:26:54 -24.066 -66.416 68.2 SALTA, ARGENTINA
M4.9 2007/04/26 05:23:46 15.503 96.135 8.6 NEAR THE SOUTH COAST OF MYANMAR

ML1.6 2007/04/26 05:03:11 36.129 -117.910 5.7 10 km ( 6 mi) NNE of Coso Junction, CA

M4.5 2007/04/26 04:59:34 28.180 56.310 14.1 SOUTHERN IRAN

ML1.4 2007/04/26 04:50:21 37.502 -121.823 4.6 10 km ( 6 mi) NE of Milpitas, CA

M4.5 2007/04/26 04:03:31 28.230 56.240 14.1 SOUTHERN IRAN

ML1.1 2007/04/26 03:16:01 38.809 -122.794 1.6 2 km ( 1 mi) NE of The Geysers, CA

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.4 2007/04/26 08:39:52 37.116 -121.526 7.2 7 km ( 5 mi) ENE of San Martin, CA
ML1.4 2007/04/26 08:36:01 38.826 -122.793 3.7 3 km ( 2 mi) NNE of The Geysers, CA
ML1.2 2007/04/26 07:22:58 33.730 -116.763 18.2 5 km ( 3 mi) WSW of Idyllwild, CA
ML1.8 2007/04/26 07:04:24 32.679 -116.047 9.2 8 km ( 5 mi) SW of Ocotillo, CA
ML1.5 2007/04/26 06:49:32 32.697 -116.048 8.5 7 km ( 4 mi) SW of Ocotillo, CA
ML1.1 2007/04/26 06:18:03 36.027 -117.764 3.2 17 km ( 10 mi) E of Coso Junction, CA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML3.3 2007/04/26 11:46:57 32.180 -115.885 7.4 63 km ( 39 mi) S of Ocotillo, CA

ML1.3 2007/04/26 11:27:41 39.211 -120.080 1.3 5 km ( 3 mi) SW of Tahoe Vista, CA
ML1.0 2007/04/26 11:27:10 39.220 -120.092 5.6 5 km ( 3 mi) SW of Tahoe Vista, CA
ML2.0 2007/04/26 10:09:33 40.936 -121.248 14.5 18 km ( 11 mi) ESE of Fall River Mills, CA

M5.0 2007/04/26 10:00:59 -18.278 172.761 161.0 VANUATU REGION
M5.4 2007/04/26 09:39:55 -17.986 172.877 22.3 VANUATU REGION

ML1.9 2007/04/26 09:39:34 33.286 -116.246 12.6 12 km ( 8 mi) ENE of Borrego Springs, CA

M4.8 2007/04/26 09:34:17 -31.455 -71.630 38.0 OFFSHORE COQUIMBO, CHILE

ML2.1 2007/04/26 09:29:24 36.041 -117.826 0.2 11 km ( 7 mi) E of Coso Junction, CA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.5 2007/04/26 14:53:31 -15.313 166.006 35.7 VANUATU

ML1.4 2007/04/26 14:40:02 36.133 -117.914 3.8 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.8 2007/04/26 14:14:29 33.274 -116.272 7.0 10 km ( 6 mi) ENE of Borrego Springs, CA

M4.1 2007/04/26 14:11:13 28.050 56.435 10.0 SOUTHERN IRAN

ML1.8 2007/04/26 13:52:22 36.966 -121.602 1.9 5 km ( 3 mi) SSW of Gilroy, CA

ML3.9 2007/04/26 13:30:51 43.309 -127.049 10.0 215 km (133 mi) W of Bandon, OR

M4.9 2007/04/26 12:23:31 46.538 152.522 10.0 KURIL ISLANDS
M5.6 2007/04/26 12:13:30 -28.152 -70.567 49.3 ATACAMA, CHILE

ML2.0 2007/04/26 12:10:14 33.168 -116.049 9.1 8 km ( 5 mi) ENE of Ocotillo Wells, CA

M5.0 2007/04/26 12:04:39 12.504 123.483 79.4 MASBATE REGION, PHILIPPINES

ML1.1 2007/04/26 12:02:46 34.687 -116.336 5.6 17 km ( 10 mi) WSW of Ludlow, CA

M5.1 2007/04/26 12:01:27 12.446 123.457 50.0 MASBATE REGION, PHILIPPINES

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.1 2007/04/26 17:42:45 53.107 156.630 250.3 KAMCHATKA PENINSULA, RUSSIA

ML1.8 2007/04/26 17:18:38 33.253 -115.614 0.2 9 km ( 6 mi) W of Niland, CA
ML1.1 2007/04/26 17:18:31 33.209 -115.636 4.2 4 km ( 3 mi) N of Obsidian Butte, CA
ML1.5 2007/04/26 17:18:24 33.185 -115.651 0.1 2 km ( 1 mi) NW of Obsidian Butte, CA

M4.4 2007/04/26 16:45:43 -31.622 -71.894 10.0 OFFSHORE COQUIMBO, CHILE

ML1.3 2007/04/26 16:40:20 33.498 -116.577 10.2 11 km ( 7 mi) SE of Anza, CA

M5.4 2007/04/26 16:37:58 42.457 143.543 56.2 HOKKAIDO, JAPAN REGION

ML1.9 2007/04/26 16:37:33 36.558 -121.157 8.0 3 km ( 2 mi) NNW of Pinnacles, CA
ML1.6 2007/04/26 16:23:56 33.179 -115.655 3.6 2 km ( 1 mi) WNW of Obsidian Butte, CA

ML3.7 2007/04/26 15:52:58 18.982 -64.449 24.8 31 km ( 19 mi) NNW of Settlement, British Virgin Islands

ML3.7 2007/04/26 15:16:15 19.356 -155.077 9.9 14 km ( 9 mi) SSE of Fern Forest, HI

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.2 2007/04/26 20:53:24 33.513 -116.448 6.6 21 km ( 13 mi) ESE of Anza, CA

ML4.5 2007/04/26 20:16:35 53.034 170.673 10.0 NEAR ISLANDS, ALEUTIAN ISLANDS, ALASKA

ML2.5 2007/04/26 20:04:04 39.563 -115.875 16.0 9 km ( 6 mi) NE of Eureka, NV
ML1.2 2007/04/26 19:44:03 33.375 -116.372 9.2 14 km ( 9 mi) N of Borrego Springs, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML3.0 2007/04/26 23:29:02 34.717 -116.297 5.3 13 km ( 8 mi) W of Ludlow, CA

ML1.2 2007/04/26 23:00:47 38.832 -122.797 2.1 4 km ( 2 mi) NNE of The Geysers, CA
ML1.2 2007/04/26 22:59:06 32.697 -116.045 10.7 7 km ( 4 mi) SW of Ocotillo, CA
ML2.3 2007/04/26 22:32:58 32.694 -116.054 9.4 7 km ( 5 mi) SW of Ocotillo, CA
ML1.9 2007/04/26 22:03:26 33.556 -116.551 19.4 11 km ( 7 mi) E of Anza, CA
ML1.6 2007/04/26 21:36:52 33.843 -117.492 0.0 8 km ( 5 mi) ESE of Corona, CA
ML1.5 2007/04/26 21:33:14 36.992 -117.034 8.0 26 km ( 16 mi) WNW of Beatty, NV
ML2.4 2007/04/26 21:32:56 37.192 -118.310 15.0 3 km ( 2 mi) NNW of Big Pine, CA
ML1.5 2007/04/26 21:02:51 35.529 -120.819 21.2 10 km ( 6 mi) WSW of Templeton, CA

April 27, 2007

Peak Crustal Resonant Frequency = 0.58 Hz (-66.98 dBv)

00:00-03:00 UTC


Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.7 2007/04/27 02:59:17 39.579 -123.352 6.8 16 km ( 10 mi) SE of Laytonville, CA

ML3.2 2007/04/27 02:35:51 18.611 -64.852 119.4 25 km ( 16 mi) NW of Little Harbour, British Virgin Islands

M4.7 2007/04/27 02:17:37 -5.376 104.878 22.9 SOUTHERN SUMATRA, INDONESIA

ML1.5 2007/04/27 00:46:35 38.313 -116.836 0.0 43 km ( 27 mi) WNW of Warm Springs, NV
ML1.6 2007/04/27 00:28:45 32.691 -116.035 10.4 6 km ( 4 mi) SW of Ocotillo, CA

03:00-06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.9 2007/04/27 05:49:49 39.583 -123.352 9.2 16 km ( 10 mi) SE of Laytonville, CA
ML1.5 2007/04/27 05:48:35 32.664 -115.673 7.3 14 km ( 9 mi) S of Seeley, CA
ML1.7 2007/04/27 05:44:53 37.464 -118.449 5.2 11 km ( 7 mi) N of West Bishop, CA
ML1.8 2007/04/27 05:00:20 36.465 -121.040 6.1 12 km ( 7 mi) SE of Pinnacles, CA
ML1.8 2007/04/27 03:35:25 37.967 -118.672 6.9 39 km ( 24 mi) E of Lee Vining, CA
ML1.6 2007/04/27 03:21:29 37.101 -115.220 4.0 30 km ( 19 mi) S of Alamo, NV
ML2.4 2007/04/27 03:02:58 39.583 -123.355 8.4 15 km ( 10 mi) SE of Laytonville, CA

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.0 2007/04/27 08:56:50 39.234 -123.474 5.9 22 km ( 13 mi) SSW of Willits, CA
ML1.5 2007/04/27 08:52:50 32.678 -116.049 11.2 8 km ( 5 mi) SW of Ocotillo, CA
ML1.2 2007/04/27 08:39:11 33.525 -116.474 9.8 19 km ( 12 mi) E of Anza, CA
ML1.7 2007/04/27 08:07:49 39.125 -123.126 5.1 3 km ( 2 mi) ESE of Talmage, CA

M5.9 2007/04/27 08:02:49 5.348 94.608 29.7 NORTHERN SUMATRA, INDONESIA

ML1.6 2007/04/27 07:05:14 34.278 -118.474 13.7 3 km ( 2 mi) ENE of Granada Hills, CA
ML1.6 2007/04/27 06:56:48 33.594 -116.736 9.5 7 km ( 5 mi) NW of Anza, CA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/27 11:46:46 39.456 -123.100 5.8 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.4 2007/04/27 11:30:28 32.685 -116.052 10.1 8 km ( 5 mi) SW of Ocotillo, CA

M4.7 2007/04/27 11:20:28 29.456 -43.203 10.0 NORTHERN MID-ATLANTIC RIDGE

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.2 2007/04/27 14:18:32 42.352 -118.553 0.6 87 km ( 54 mi) N of Quinn River Crossing, NV

M5.8 2007/04/27 13:49:28 -6.980 155.970 46.0 BOUGAINVILLE REGION, PAPUA NEW GUINEA
M4.5 2007/04/27 13:21:20 -17.794 -178.603 580.5 FIJI REGION

ML1.8 2007/04/27 13:12:14 36.760 -113.917 1.0 15 km ( 10 mi) ESE of Mesquite, NV
ML2.0 2007/04/27 12:51:32 36.387 -120.967 5.5 23 km ( 14 mi) SE of Pinnacles, CA
ML1.4 2007/04/27 12:41:48 37.613 -118.916 3.1 6 km ( 4 mi) ESE of Mammoth Lakes, CA

M4.5 2007/04/27 12:30:35 45.935 143.216 337.0 HOKKAIDO, JAPAN REGION

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.4 2007/04/27 17:52:33 37.632 -122.386 7.4 4 km ( 2 mi) ENE of San Bruno, CA
ML1.5 2007/04/27 17:25:00 36.937 -115.075 4.0 38 km ( 23 mi) W of Hoya, NV
ML2.5 2007/04/27 17:08:30 37.123 -115.295 0.0 29 km ( 18 mi) SSW of Alamo, NV
ML2.4 2007/04/27 17:04:17 37.123 -115.295 0.0 29 km ( 18 mi) SSW of Alamo, NV
ML1.8 2007/04/27 16:44:02 37.144 -115.319 4.0 28 km ( 18 mi) SSW of Alamo, NV
ML1.9 2007/04/27 16:43:10 35.312 -118.540 5.5 9 km ( 6 mi) NNE of Keene, CA
ML2.2 2007/04/27 16:30:49 37.103 -115.295 0.0 31 km ( 19 mi) SSW of Alamo, NV
ML1.5 2007/04/27 16:12:59 36.872 -114.902 16.0 24 km ( 15 mi) WSW of Hoya, NV
ML1.1 2007/04/27 16:08:14 37.143 -115.294 0.0 27 km ( 17 mi) SSW of Alamo, NV
ML1.2 2007/04/27 16:01:24 37.163 -115.293 0.0 25 km ( 16 mi) SSW of Alamo, NV

ML3.5 2007/04/27 15:46:11 19.152 -68.039 15.0 92 km ( 57 mi) NE of Higüey, Dominican Republic

ML3.8 2007/04/27 15:42:50 37.102 -115.270 0.0 31 km ( 19 mi) SSW of Alamo, NV

ML2.3 2007/04/27 15:36:43 40.388 -122.201 21.6 7 km ( 4 mi) E of Cottonwood, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.3 2007/04/27 20:53:10 35.618 -120.799 0.8 11 km ( 7 mi) NW of Templeton, CA
ML2.1 2007/04/27 20:50:26 37.124 -115.320 0.0 30 km ( 19 mi) SSW of Alamo, NV
ML1.5 2007/04/27 20:39:09 37.353 -117.080 0.0 17 km ( 11 mi) ENE of Tokop, NV
ML1.8 2007/04/27 20:26:17 37.611 -122.374 11.5 3 km ( 2 mi) ENE of Millbrae, CA
ML1.9 2007/04/27 20:26:09 37.142 -115.322 0.0 29 km ( 18 mi) SSW of Alamo, NV
ML2.0 2007/04/27 20:20:15 37.353 -117.054 0.0 19 km ( 12 mi) ENE of Tokop, NV
ML1.5 2007/04/27 20:19:36 32.667 -116.046 10.6 9 km ( 6 mi) SSW of Ocotillo, CA
ML1.9 2007/04/27 20:07:00 37.151 -115.325 4.2 28 km ( 17 mi) SSW of Alamo, NV
ML1.9 2007/04/27 20:04:36 37.916 -121.980 9.5 5 km ( 3 mi) SW of Clayton, CA
ML2.2 2007/04/27 20:03:53 36.284 -120.721 7.2 15 km ( 10 mi) SSW of New Idria, CA

ML3.6 2007/04/27 19:55:11 37.131 -115.294 9.2 28 km ( 18 mi) SSW of Alamo, NV

ML1.3 2007/04/27 19:37:27 34.312 -116.428 7.8 21 km ( 13 mi) N of Yucca Valley, CA
ML1.5 2007/04/27 19:01:14 36.079 -117.652 2.0 22 km ( 14 mi) SSW of Darwin, CA
ML1.5 2007/04/27 18:34:28 36.018 -115.236 8.0 4 km ( 2 mi) WSW of Enterprise, NV
ML1.2 2007/04/27 18:33:06 36.017 -120.596 0.9 20 km ( 12 mi) NW of Parkfield, CA

M4.8 2007/04/27 18:28:33 11.501 -86.757 68.3 NEAR THE COAST OF NICARAGUA

ML2.0 2007/04/27 18:01:06 37.253 -121.633 6.3 14 km ( 9 mi) N of Morgan Hill, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.7 2007/04/27 23:57:13 38.339 -117.450 16.0 36 km ( 22 mi) NNW of Tonopah, NV

M4.7 2007/04/27 23:47:58 54.369 161.427 10.0 NEAR THE EAST COAST OF KAMCHATKA, RUSSIA

ML2.3 2007/04/27 23:31:52 36.824 -121.553 5.6 3 km ( 2 mi) SSW of San Juan Bautista, CA
ML1.4 2007/04/27 23:28:26 36.601 -121.094 9.2 9 km ( 6 mi) NNE of Pinnacles, CA

ML3.5 2007/04/27 22:56:30 18.212 -68.012 114.7 82 km ( 51 mi) W of Rincón, PR

M4.9 2007/04/27 22:44:11 42.017 142.280 67.8 HOKKAIDO, JAPAN REGION

ML1.2 2007/04/27 22:40:38 38.827 -122.794 4.1 3 km ( 2 mi) NNE of The Geysers, CA
ML1.1 2007/04/27 22:07:36 37.273 -114.885 0.0 25 km ( 16 mi) SSW of Helene, NV
ML1.6 2007/04/27 21:52:17 37.142 -115.269 0.0 27 km ( 16 mi) SSW of Alamo, NV
ML1.9 2007/04/27 21:24:57 36.540 -121.103 8.6 4 km ( 2 mi) ENE of Pinnacles, CA
ML1.5 2007/04/27 21:22:45 37.164 -115.318 8.0 26 km ( 16 mi) SSW of Alamo, NV
ML1.8 2007/04/27 21:16:59 34.039 -116.435 13.1 10 km ( 6 mi) S of Yucca Valley, CA
ML1.4 2007/04/27 21:16:11 37.081 -115.221 0.0 32 km ( 20 mi) S of Alamo, NV

April 28, 2007

24 Hour Peak Crustal Resonant Frequency = 0.13 Hz (-64.61 dBv)

00:00-03:00 UTC


Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.1 2007/04/28 02:39:54 37.061 -115.221 4.0 34 km ( 21 mi) S of Alamo, NV
ML1.5 2007/04/28 02:36:06 32.693 -116.031 9.1 6 km ( 4 mi) SSW of Ocotillo, CA
ML1.9 2007/04/28 02:11:37 32.978 -115.548 21.7 1 km ( 1 mi) W of Brawley, CA
ML1.5 2007/04/28 01:51:55 36.569 -121.082 10.5 7 km ( 4 mi) NE of Pinnacles, CA
ML1.6 2007/04/28 01:46:29 32.699 -116.042 10.4 6 km ( 4 mi) SW of Ocotillo, CA

ML3.1 2007/04/28 01:40:36 37.122 -115.269 0.0 29 km ( 18 mi) SSW of Alamo, NV

ML1.6 2007/04/28 01:00:13 32.527 -116.363 8.6 25 km ( 16 mi) E of Tecate, Mexico
ML1.7 2007/04/28 00:36:52 33.530 -117.794 43.0 2 km ( 1 mi) W of Laguna Beach, CA
ML1.7 2007/04/28 00:34:00 36.561 -121.081 8.0 6 km ( 4 mi) ENE of Pinnacles, CA
ML2.4 2007/04/28 00:29:53 36.545 -121.106 8.8 4 km ( 2 mi) ENE of Pinnacles, CA
ML2.4 2007/04/28 00:27:10 36.562 -121.076 8.5 7 km ( 4 mi) ENE of Pinnacles, CA

03:00-06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.9 2007/04/28 05:53:50 36.557 -121.073 8.7 7 km ( 4 mi) ENE of Pinnacles, CA
ML2.2 2007/04/28 05:26:59 39.106 -116.123 16.0 37 km ( 23 mi) N of Pritchards Station, NV

ML4.9 2007/04/28 05:20:30 69.652 -144.791 11.1 NORTHERN ALASKA

ML2.4 2007/04/28 04:37:14 37.123 -115.295 4.0 29 km ( 18 mi) SSW of Alamo, NV
ML1.9 2007/04/28 04:27:00 39.452 -123.108 3.4 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/28 04:07:36 32.693 -116.055 10.5 7 km ( 5 mi) SW of Ocotillo, CA

M4.9 2007/04/28 03:40:05 -18.969 -172.889 36.1 TONGA REGION

ML1.3 2007/04/28 03:31:16 37.143 -115.294 12.0 27 km ( 17 mi) SSW of Alamo, NV

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/28 08:55:24 35.557 -120.804 8.4 9 km ( 5 mi) W of Templeton, CA
ML1.9 2007/04/28 08:49:52 37.911 -122.284 6.1 1 km ( 0 mi) NW of Kensington, CA
ML1.6 2007/04/28 08:38:13 37.144 -115.319 0.0 28 km ( 18 mi) SSW of Alamo, NV
ML2.3 2007/04/28 08:28:50 34.112 -117.317 14.4 3 km ( 2 mi) SW of San Bernardino, CA
ML1.5 2007/04/28 08:27:43 33.419 -116.366 17.4 19 km ( 12 mi) N of Borrego Springs, CA
ML1.4 2007/04/28 08:25:32 35.944 -117.514 1.0 23 km ( 14 mi) NNW of Searles Valley, CA

ML3.3 2007/04/28 08:04:56 34.124 -117.302 14.1 1 km ( 1 mi) SW of San Bernardino, CA

ML1.2 2007/04/28 08:03:31 37.081 -115.221 0.0 32 km ( 20 mi) S of Alamo, NV

M4.7 2007/04/28 07:18:12 51.024 1.030 10.0 ENGLAND, UNITED KINGDOM

ML1.7 2007/04/28 07:14:50 40.222 -121.297 3.2 10 km ( 6 mi) W of Almanor, CA
ML1.2 2007/04/28 06:16:23 32.663 -116.061 10.3 10 km ( 6 mi) SW of Ocotillo, CA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.7 2007/04/28 11:31:40 33.460 -116.624 13.2 12 km ( 7 mi) SSE of Anza, CA
ML1.1 2007/04/28 11:01:31 37.648 -118.882 6.7 9 km ( 5 mi) E of Mammoth Lakes, CA

ML3.0 2007/04/28 10:31:05 19.668 -155.932 14.6 7 km ( 4 mi) NE of Holualoa, HI

ML3.1 2007/04/28 10:29:12 18.214 -68.108 97.0 78 km ( 48 mi) SE of Higüey, Dominican Republic
ML3.5 2007/04/28 10:26:51 18.225 -68.016 107.1 82 km ( 51 mi) W of Rincón, PR

ML2.1 2007/04/28 10:23:16 37.295 -121.103 10.0 8 km ( 5 mi) WSW of Newman, CA
ML2.1 2007/04/28 10:13:36 39.584 -123.352 8.9 15 km ( 10 mi) SE of Laytonville, CA
ML1.7 2007/04/28 09:57:14 34.273 -116.978 9.1 7 km ( 4 mi) WNW of town of Big Bear Lake, CA

M4.8 2007/04/28 09:12:27 -11.952 166.575 94.3 SANTA CRUZ ISLANDS

ML4.3 2007/04/28 09:01:18 52.713 -175.439 230.3 ANDREANOF ISLANDS, ALEUTIAN IS., ALASKA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML3.3 2007/04/28 14:55:17 33.074 -116.499 11.8 8 km ( 5 mi) E of Julian, CA

ML1.4 2007/04/28 14:04:45 32.790 -115.435 11.8 6 km ( 4 mi) WSW of Holtville, CA

M6.1 2007/04/28 14:02:38 -60.684 -20.180 10.0 EAST OF THE SOUTH SANDWICH ISLANDS

ML4.9 2007/04/28 13:56:37 17.207 -99.599 34.6 GUERRERO, MEXICO

ML3.0 2007/04/28 13:28:12 39.439 -123.100 0.0 13 km ( 8 mi) WNW of Lake Pillsbury, CA

M5.2 2007/04/28 13:24:52 23.316 143.368 47.9 VOLCANO ISLANDS, JAPAN REGION

ML1.8 2007/04/28 13:15:09 36.700 -121.338 4.9 10 km ( 6 mi) S of Tres Pinos, CA
ML1.4 2007/04/28 13:05:14 32.687 -116.040 8.7 7 km ( 4 mi) SW of Ocotillo, CA
ML2.2 2007/04/28 12:54:33 39.469 -123.117 2.6 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/28 12:12:21 40.844 -121.845 0.5 6 km ( 4 mi) E of Montgomery Creek, CA

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.2 2007/04/28 17:46:50 33.072 -116.500 13.6 8 km ( 5 mi) E of Julian, CA
ML1.5 2007/04/28 17:34:39 33.075 -116.496 12.7 8 km ( 5 mi) E of Julian, CA

M4.8 2007/04/28 17:06:19 33.091 97.977 30.1 QINGHAI-SICHUAN BORDER REGION, CHINA

ML1.5 2007/04/28 16:37:57 32.691 -116.039 11.8 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/28 15:53:19 33.729 -116.840 16.7 6 km ( 4 mi) ESE of Valle Vista, CA
ML1.6 2007/04/28 15:43:43 32.687 -116.044 13.2 7 km ( 5 mi) SW of Ocotillo, CA
ML1.3 2007/04/28 15:02:55 33.066 -116.492 12.9 9 km ( 5 mi) E of Julian, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.4 2007/04/28 20:16:17 34.020 -117.093 17.1 4 km ( 3 mi) WSW of Yucaipa, CA

M5.1 2007/04/28 20:12:45 48.221 154.772 3.5 KURIL ISLANDS
M4.7 2007/04/28 20:11:57 48.178 154.880 26.5 KURIL ISLANDS
M4.6 2007/04/28 20:11:49 40.380 53.600 44.0 TURKMENISTAN

ML1.2 2007/04/28 19:57:52 38.792 -122.746 2.2 5 km ( 3 mi) WNW of Anderson Springs, CA
ML2.1 2007/04/28 19:33:48 39.060 -117.340 16.0 14 km ( 9 mi) SW of Washington, NV
ML1.4 2007/04/28 19:31:51 33.366 -116.350 17.6 13 km ( 8 mi) N of Borrego Springs, CA

ML4.3 2007/04/28 19:29:43 54.038 -133.572 10.0 QUEEN CHARLOTTE ISLANDS REGION

M4.9 2007/04/28 19:14:31 1.753 99.255 39.2 NORTHERN SUMATRA, INDONESIA

ML1.9 2007/04/28 19:25:14 39.440 -123.097 3.8 12 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.1 2007/04/28 18:56:04 36.724 -121.388 6.4 9 km ( 6 mi) SW of Tres Pinos, CA
ML1.5 2007/04/28 18:12:30 36.456 -121.037 6.7 13 km ( 8 mi) SE of Pinnacles, CA
ML2.5 2007/04/28 18:07:35 33.870 -117.803 12.7 2 km ( 1 mi) SW of Yorba Linda, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.7 2007/04/28 23:50:21 38.837 -122.796 1.4 4 km ( 3 mi) NNE of The Geysers, CA
ML1.9 2007/04/28 23:47:01 35.832 -116.877 2.5 42 km ( 26 mi) SSE of Telescope Peak, CA
ML1.3 2007/04/28 23:31:28 33.491 -116.430 10.4 24 km ( 15 mi) ESE of Anza, CA

ML3.2 2007/04/28 23:12:26 19.304 -67.942 13.8 111 km ( 69 mi) NE of Higüey, Dominican Republic

ML1.4 2007/04/28 23:04:43 38.794 -122.800 4.1 1 km ( 0 mi) SE of The Geysers, CA
ML1.4 2007/04/28 21:55:29 37.235 -114.962 0.0 23 km ( 14 mi) SE of Alamo, NV
ML2.3 2007/04/28 21:29:54 35.924 -120.478 5.1 5 km ( 3 mi) WNW of Parkfield, CA
ML1.6 2007/04/28 21:18:02 36.093 -117.869 4.6 9 km ( 6 mi) NE of Coso Junction, CA

April 29, 2007

24 Hour Peak Crustal Resonant Frequency = 0.56 Hz (-67.21 dBv)

00:00-03:00 UTC


Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.6 2007/04/29 02:57:40 -4.756 153.351 72.5 NEW IRELAND REGION, PAPUA NEW GUINEA

ML1.6 2007/04/29 02:46:43 32.685 -116.059 10.1 8 km ( 5 mi) SW of Ocotillo, CA
ML1.3 2007/04/29 01:42:55 37.102 -115.245 4.0 30 km ( 19 mi) SSW of Alamo, NV

ML3.2 2007/04/29 00:50:22 40.995 -119.845 0.0 20 km ( 13 mi) SSE of Reederville, NV

ML4.8 2007/04/29 00:49:06 43.484 -126.899 5.0 205 km (128 mi) WNW of Bandon, OR

ML1.4 2007/04/29 00:43:16 32.694 -116.037 12.3 6 km ( 4 mi) SW of Ocotillo, CA
ML1.4 2007/04/29 00:09:27 37.143 -115.294 4.0 27 km ( 17 mi) SSW of Alamo, NV

03:00-06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/29 05:20:54 36.112 -117.928 2.9 8 km ( 5 mi) NNE of Coso Junction, CA
ML1.7 2007/04/29 05:14:59 37.124 -115.320 4.0 30 km ( 19 mi) SSW of Alamo, NV
ML1.3 2007/04/29 04:50:36 37.081 -115.221 4.0 32 km ( 20 mi) S of Alamo, NV
ML1.3 2007/04/29 04:36:02 36.976 -115.049 16.0 35 km ( 22 mi) W of Hoya, NV
ML1.5 2007/04/29 04:24:30 37.123 -115.295 0.0 29 km ( 18 mi) SSW of Alamo, NV
ML1.6 2007/04/29 04:09:04 36.129 -117.911 5.8 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.5 2007/04/29 04:08:47 39.449 -123.101 5.7 13 km ( 8 mi) WNW of Lake Pillsbury, CA

M5.4 2007/04/29 03:44:30 -8.294 157.186 10.0 SOLOMON ISLANDS

ML2.3 2007/04/29 03:32:41 37.123 -115.295 0.0 29 km ( 18 mi) SSW of Alamo, NV

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.3 2007/04/29 08:50:15 32.717 -116.035 1.2 4 km ( 3 mi) SW of Ocotillo, CA
ML1.8 2007/04/29 08:25:22 37.123 -115.295 0.0 29 km (18 mi) SSW of Alamo, NV
ML1.7 2007/04/29 08:17:06 37.144 -115.319 0.0 28 km (18 mi) SSW of Alamo, NV
ML2.6 2007/04/29 08:15:09 36.518 -121.101 4.6 4 km ( 3 mi) ESE of Pinnacles, CA
ML1.5 2007/04/29 07:46:44 32.691 -116.040 11.2 7 km ( 4 mi) SW of Ocotillo, CA
ML2.2 2007/04/29 07:40:11 32.687 -116.066 6.3 9 km ( 5 mi) SW of Ocotillo, CA
ML1.2 2007/04/29 07:31:22 37.502 -118.842 8.2 16 km (10 mi) WSW of Toms Place, CA
ML2.4 2007/04/29 07:30:57 39.439 -123.101 3.4 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.4 2007/04/29 07:23:42 32.676 -116.074 10.5 10 km ( 6 mi) SW of Ocotillo, CA

ML3.2 2007/04/29 07:20:12 32.675 -116.065 10.3 10 km ( 6 mi) SW of Ocotillo, CA

ML1.5 2007/04/29 07:05:19 32.692 -116.027 11.5 6 km ( 4 mi) SSW of Ocotillo, CA
ML1.3 2007/04/29 06:53:22 33.673 -116.815 13.8 12 km ( 7 mi) SE of Valle Vista, CA
ML1.2 2007/04/29 06:40:55 37.820 -116.005 8.0 37 km (23 mi) WNW of Tempiute, NV

M4.9 2007/04/29 06:33:55 25.336 62.227 29.3 SOUTHWESTERN PAKISTAN
M4.4 2007/04/29 06:33:08 -19.861 -178.015 378.1 FIJI REGION

ML1.6 2007/04/29 06:23:38 37.820 -116.005 4.0 37 km (23 mi) WNW of Tempiute, NV
ML1.3 2007/04/29 06:11:08 37.122 -115.269 0.0 29 km (18 mi) SSW of Alamo, NV

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.5 2007/04/29 11:47:45 32.676 -116.059 10.3 9 km ( 6 mi) SW of Ocotillo, CA
ML2.3 2007/04/29 11:44:09 39.441 -123.107 4.5 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.0 2007/04/29 11:31:02 32.674 -116.055 10.4 9 km ( 6 mi) SW of Ocotillo, CA
ML2.1 2007/04/29 11:25:32 39.441 -123.106 4.6 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.2 2007/04/29 11:13:59 37.143 -115.294 12.0 27 km ( 17 mi) SSW of Alamo, NV
ML1.1 2007/04/29 11:07:41 37.618 -118.781 2.0 11 km ( 7 mi) NW of Toms Place, CA
ML2.2 2007/04/29 10:18:21 36.011 -120.578 4.1 18 km ( 11 mi) NW of Parkfield, CA
ML1.5 2007/04/29 10:10:49 37.143 -115.294 0.0 27 km ( 17 mi) SSW of Alamo, NV
ML2.5 2007/04/29 10:08:22 36.012 -120.576 4.4 18 km ( 11 mi) NW of Parkfield, CA
ML1.2 2007/04/29 09:50:42 37.119 -115.118 0.0 28 km ( 17 mi) S of Alamo, NV
ML1.5 2007/04/29 09:50:29 34.108 -117.323 14.9 4 km ( 2 mi) SW of San Bernardino, CA
ML1.2 2007/04/29 09:48:56 37.102 -115.245 0.0 30 km ( 19 mi) SSW of Alamo, NV
ML1.1 2007/04/29 09:41:35 37.123 -115.295 4.0 29 km ( 18 mi) SSW of Alamo, NV
ML2.1 2007/04/29 09:13:33 39.439 -123.099 3.6 13 km ( 8 mi) WNW of Lake Pillsbury, CA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.2 2007/04/29 14:48:50 38.319 -118.602 0.0 7 km ( 4 mi) W of Qualeys Camp, NV
ML1.4 2007/04/29 14:36:29 37.204 -115.342 0.0 24 km ( 15 mi) SW of Alamo, NV
ML1.7 2007/04/29 14:32:59 39.678 -123.544 2.2 5 km ( 3 mi) W of Laytonville, CA
ML1.4 2007/04/29 14:18:19 38.319 -118.627 8.0 9 km ( 5 mi) W of Qualeys Camp, NV
ML2.8 2007/04/29 14:07:19 32.683 -116.064 5.5 9 km ( 6 mi) SW of Ocotillo, CA
ML1.8 2007/04/29 13:54:18 32.698 -116.044 6.6 6 km ( 4 mi) SW of Ocotillo, CA
ML1.9 2007/04/29 13:53:17 32.681 -116.057 10.4 9 km ( 5 mi) SW of Ocotillo, CA

M4.3 2007/04/29 13:40:15 45.111 137.357 312.3 PRIMOR'YE, RUSSIA

ML1.7 2007/04/29 13:32:51 37.367 -121.731 6.2 8 km ( 5 mi) E of Alum Rock, CA

ML3.4 2007/04/29 13:06:32 38.797 -122.729 2.1 4 km ( 3 mi) NW of Anderson Springs, CA

ML2.0 2007/04/29 13:05:48 38.796 -122.735 2.3 4 km ( 3 mi) WNW of Anderson Springs, CA
ML1.3 2007/04/29 12:43:17 35.932 -117.686 4.0 27 km ( 17 mi) ESE of Coso Junction, CA

ML6.2 2007/04/29 12:41:58 52.079 -179.979 123.3 ANDREANOF ISLANDS, ALEUTIAN IS., ALASKA

ML1.6 2007/04/29 12:22:32 38.779 -122.756 1.7 5 km ( 3 mi) ESE of The Geysers, CA

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M5.0 2007/04/29 17:22:53 2.755 95.765 43.2 SIMEULUE, INDONESIA
M4.9 2007/04/29 17:08:52 -6.823 155.815 10.0 BOUGAINVILLE REGION, PAPUA NEW GUINEA

ML2.0 2007/04/29 16:06:35 32.702 -116.048 7.0 6 km ( 4 mi) SW of Ocotillo, CA

M4.5 2007/04/29 15:45:26 -25.316 179.290 511.9 SOUTH OF THE FIJI ISLANDS

ML1.0 2007/04/29 15:04:12 36.592 -121.144 9.7 7 km ( 4 mi) N of Pinnacles, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

M4.6 2007/04/29 20:41:32 28.608 129.483 61.4 RYUKYU ISLANDS, JAPAN

ML1.4 2007/04/29 20:36:03 34.282 -116.685 5.7 15 km ( 9 mi) E of Big Bear City, CA
ML1.9 2007/04/29 20:18:25 32.683 -116.051 10.4 8 km ( 5 mi) SW of Ocotillo, CA
ML1.1 2007/04/29 20:11:21 36.978 -116.054 0.0 56 km ( 35 mi) NW of Indian Springs, NV
ML1.2 2007/04/29 20:01:14 38.319 -118.627 0.0 9 km ( 5 mi) W of Qualeys Camp, NV
ML1.4 2007/04/29 19:15:17 37.124 -115.320 0.0 30 km ( 19 mi) SSW of Alamo, NV
ML2.8 2007/04/29 18:44:36 39.439 -123.097 4.0 12 km ( 8 mi) WNW of Lake Pillsbury, CA

M4.6 2007/04/29 18:40:07 16.409 94.039 12.5 NEAR THE SOUTH COAST OF MYANMAR

ML1.9 2007/04/29 18:35:23 33.873 -117.844 11.2 1 km ( 1 mi) SE of Placentia, CA
ML1.5 2007/04/29 18:31:54 34.083 -116.799 3.9 3 km ( 2 mi) SE of Mt. San Gorgonio, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.6 2007/04/29 23:46:36 38.823 -122.823 2.5 3 km ( 2 mi) NNW of The Geysers, CA

M4.5 2007/04/29 23:29:47 -19.832 -177.802 531.1 FIJI REGION

ML1.3 2007/04/29 23:09:09 36.002 -120.598 3.4 19 km ( 12 mi) NW of Parkfield, CA

M4.7 2007/04/29 22:56:21 13.449 143.628 181.3 GUAM REGION
M4.6 2007/04/29 22:55:50 50.926 157.242 105.9 KURIL ISLANDS

ML1.9 2007/04/29 22:01:46 34.277 -118.467 11.2 3 km ( 2 mi) WSW of Pacoima, CA
ML1.3 2007/04/29 21:50:43 37.142 -115.269 12.0 27 km ( 16 mi) SSW of Alamo, NV
ML2.4 2007/04/29 21:29:51 35.555 -118.758 5.0 28 km ( 17 mi) WSW of town of Lake Isabella, CA
ML2.3 2007/04/29 21:04:52 38.794 -122.803 4.4 1 km ( 0 mi) SE of The Geysers, CA

April 30, 2007

24 Hour Peak Crustal Resonant Frequency = 0.54 Hz (-66.84 dBv)

00:00-03:00 UTC


Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/30 02:37:39 35.028 -117.692 0.0 3 km ( 2 mi) WNW of Boron, CA
ML1.1 2007/04/30 01:06:32 35.318 -120.541 8.2 12 km ( 8 mi) ENE of San Luis Obispo, CA

M4.8 2007/04/30 00:26:22 -14.786 167.219 195.0 VANUATU

03:00-06:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.6 2007/04/30 05:53:56 32.690 -116.054 10.8 8 km ( 5 mi) SW of Ocotillo, CA
ML1.4 2007/04/30 05:46:35 38.669 -119.553 4.3 21 km ( 13 mi) E of Markleeville, CA
ML2.4 2007/04/30 05:25:37 33.368 -116.385 8.5 13 km ( 8 mi) N of Borrego Springs, CA

ML3.0 2007/04/30 05:23:52 33.365 -116.386 9.4 13 km ( 8 mi) N of Borrego Springs, CA

ML1.4 2007/04/30 05:19:25 33.502 -115.832 10.1 10 km ( 6 mi) ESE of North Shore, CA
ML1.3 2007/04/30 05:07:51 36.130 -117.909 5.5 10 km ( 6 mi) NNE of Coso Junction, CA
ML1.4 2007/04/30 05:07:17 37.144 -115.319 0.0 28 km ( 18 mi) SSW of Alamo, NV
ML1.2 2007/04/30 05:07:14 32.696 -116.052 10.9 7 km ( 4 mi) SW of Ocotillo, CA

M4.5 2007/04/30 04:36:27 42.914 146.291 35.0 OFF THE COAST OF HOKKAIDO, JAPAN
M4.5 2007/04/30 04:04:32 -17.445 -178.723 561.8 FIJI REGION

ML1.6 2007/04/30 03:15:52 32.684 -116.046 9.9 8 km ( 5 mi) SW of Ocotillo, CA
ML1.9 2007/04/30 03:10:55 37.425 -114.087 4.2 15 km ( 9 mi) SE of Joseco, NV

06:00-09:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML3.2 2007/04/30 08:41:20 19.251 -67.634 44.5 104 km ( 64 mi) NNW of Cabán, PR

ML1.7 2007/04/30 08:32:33 38.803 -122.822 4.6 1 km ( 1 mi) WNW of The Geysers, CA
ML2.4 2007/04/30 07:32:38 40.246 -122.801 9.6 47 km ( 29 mi) SE of Hayfork, CA
ML2.2 2007/04/30 07:23:47 37.533 -118.815 5.9 12 km ( 8 mi) WSW of Toms Place, CA
ML1.6 2007/04/30 06:14:33 40.428 -122.060 20.3 17 km ( 10 mi) W of Manton, CA

09:00-12:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.0 2007/04/30 10:44:55 32.691 -116.036 10.1 6 km ( 4 mi) SW of Ocotillo, CA
ML1.8 2007/04/30 10:05:29 37.534 -118.814 6.0 12 km ( 8 mi) WSW of Toms Place, CA
ML1.8 2007/04/30 09:11:34 37.532 -118.815 5.6 12 km ( 8 mi) WSW of Toms Place, CA
ML1.0 2007/04/30 09:09:59 37.530 -118.815 5.3 12 km ( 8 mi) WSW of Toms Place, CA

12:00-15:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML2.5 2007/04/30 14:34:13 34.693 -118.990 14.6 15 km ( 9 mi) SSW of Frazier Park, CA

M5.3 2007/04/30 13:59:43 38.437 97.799 10.0 NORTHERN QINGHAI, CHINA

ML2.9 2007/04/30 13:57:45 36.586 -121.181 4.3 7 km ( 4 mi) NNW of Pinnacles, CA
ML1.9 2007/04/30 13:35:13 33.370 -116.382 6.5 14 km ( 9 mi) N of Borrego Springs, CA
ML1.4 2007/04/30 13:34:47 37.194 -117.283 8.0 12 km ( 8 mi) S of Tokop, NV
ML1.7 2007/04/30 13:15:36 32.707 -116.036 3.2 5 km ( 3 mi) SW of Ocotillo, CA
ML1.1 2007/04/30 13:09:17 37.144 -115.319 0.0 28 km ( 18 mi) SSW of Alamo, NV
ML1.9 2007/04/30 12:47:18 35.842 -116.879 5.0 41 km ( 25 mi) SSE of Telescope Peak, CA
ML1.9 2007/04/30 12:46:20 35.836 -116.880 2.9 41 km ( 26 mi) SSE of Telescope Peak, CA

M5.0 2007/04/30 12:37:53 -7.142 156.241 10.0 SOLOMON ISLANDS

ML1.4 2007/04/30 12:17:14 37.164 -115.318 0.0 26 km ( 16 mi) SSW of Alamo, NV
ML1.3 2007/04/30 12:15:01 37.102 -115.270 8.0 31 km ( 19 mi) SSW of Alamo, NV
ML1.3 2007/04/30 12:11:44 37.214 -117.258 4.0 10 km ( 6 mi) S of Tokop, NV

15:00-18:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.3 2007/04/30 17:33:31 38.810 -122.778 2.4 3 km ( 2 mi) ENE of The Geysers, CA

M4.5 2007/04/30 16:55:40 32.139 137.355 414.6 IZU ISLANDS, JAPAN REGION

ML1.6 2007/04/30 16:54:23 38.822 -122.823 2.7 3 km ( 2 mi) NNW of The Geysers, CA
ML1.2 2007/04/30 16:05:21 38.822 -122.826 2.6 3 km ( 2 mi) NNW of The Geysers, CA
ML1.5 2007/04/30 16:00:37 38.822 -122.824 2.8 3 km ( 2 mi) NNW of The Geysers, CA

ML3.1 2007/04/30 15:51:28 38.820 -122.823 3.4 3 km ( 2 mi) NNW of The Geysers, CA

ML2.1 2007/04/30 15:19:46 39.471 -123.114 3.0 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.8 2007/04/30 15:06:37 33.368 -116.387 9.2 14 km ( 8 mi) N of Borrego Springs, CA

18:00-21:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.5 2007/04/30 20:58:33 32.686 -116.058 9.7 8 km ( 5 mi) SW of Ocotillo, CA
ML1.7 2007/04/30 20:51:24 38.833 -122.805 2.2 4 km ( 2 mi) N of The Geysers, CA
ML1.8 2007/04/30 20:09:18 37.528 -118.790 6.3 10 km ( 6 mi) WSW of Toms Place, CA

ML3.3 2007/04/30 19:37:15 18.061 -68.589 120.7 57 km ( 36 mi) SE of La Romana, Dominican Republic

ML1.7 2007/04/30 19:33:26 37.536 -118.814 5.9 12 km ( 8 mi) WSW of Toms Place, CA
ML1.4 2007/04/30 19:18:24 32.678 -116.043 10.4 8 km ( 5 mi) SSW of Ocotillo, CA
ML2.6 2007/04/30 18:52:49 33.902 -118.258 25.9 2 km ( 1 mi) SSW of Willowbrook, CA
ML2.7 2007/04/30 18:41:43 36.561 -121.077 8.6 7 km ( 4 mi) ENE of Pinnacles, CA
ML1.2 2007/04/30 18:40:45 37.532 -118.812 5.3 12 km ( 8 mi) WSW of Toms Place, CA
ML1.0 2007/04/30 18:34:49 37.532 -118.811 6.0 12 km ( 7 mi) WSW of Toms Place, CA
ML1.2 2007/04/30 18:26:33 33.804 -116.872 13.1 6 km ( 4 mi) NNE of Valle Vista, CA
ML1.5 2007/04/30 18:22:05 34.281 -116.689 4.0 14 km ( 9 mi) E of Big Bear City, CA
ML1.8 2007/04/30 18:11:21 33.898 -118.239 23.2 1 km ( 1 mi) W of Compton, CA
ML1.0 2007/04/30 18:01:03 37.586 -118.868 19.9 11 km ( 7 mi) ESE of Mammoth Lakes, CA

21:00-24:00 UTC

Return to Table of Contents Graphic:(AE)Infrasonic Spectrogram Caption: Infrasonic Resonant Harmonic Activity, which was detected and inferred to be associated with building deep crustal stress along the Pacific-North American Plate Boundary in Southern California.

ANSS Seismic Catalog: CA/NV/BAJA & Regions with Special Interest

MAG   DATE   UTC-TIME         LAT   LON   DEPTH   LOCATION
            y/m/d         h:m:s           deg     deg     km

ML1.7 2007/04/30 23:48:09 34.150 -116.421 11.0 3 km ( 2 mi) N of Yucca Valley, CA
ML1.4 2007/04/30 23:39:37 33.148 -115.988 8.2 13 km ( 8 mi) E of Ocotillo Wells, CA
ML1.6 2007/04/30 23:36:03 33.010 -116.262 7.9 19 km ( 12 mi) SW of Ocotillo Wells, CA
ML1.4 2007/04/30 23:27:41 33.721 -116.722 22.2 3 km ( 2 mi) SSW of Idyllwild, CA
ML1.5 2007/04/30 22:58:22 33.994 -117.174 14.4 7 km ( 4 mi) S of Redlands, CA

ML3.4 2007/04/30 22:44:27 19.809 -65.380 34.3 161 km (100 mi) NNE of Vieques, PR

M5.0 2007/04/30 22:31:17 12.633 142.555 90.6 MARIANA ISLANDS REGION

ML1.3 2007/04/30 22:00:13 38.718 -119.622 5.0 16 km ( 10 mi) ENE of Markleeville, CA

ML3.5 2007/04/30 21:57:32 38.720 -119.620 0.3 16 km ( 10 mi) ENE of Markleeville, CA

ML1.4 2007/04/30 21:40:50 36.551 -121.064 20.2 7 km ( 5 mi) ENE of Pinnacles, CA
ML1.5 2007/04/30 21:07:25 33.797 -116.059 4.1 17 km ( 11 mi) NE of Coachella, CA

Frank Condon

Independent Earthquake Precursor Research Consultant

This information is provided as a public service by GeoSeismic Labs of California, a State Registered "Not for Profit" Public Benefit Corporation Since 2001.

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