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Earthquake
Precursor
Research



©GeoSeismic Labs 2007.

Supplement to Volume 7
Issue No. 4.2

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 15-21, 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

M2.9
Date-Time Friday, April 20, 2007 at 11:28:06 (UTC)
= Coordinated Universal Time
Friday, April 20, 2007 at 4:28:06 AM
= local time at epicenter

Location 34.034°N, 117.169°W
Depth 13.3 km (8.3 miles)
Region GREATER LOS ANGELES AREA, CALIFORNIA
Distances 2 km (2 miles) S (175°) from Redlands, CA
6 km (4 miles) SW (233°) from Mentone, CA
8 km (5 miles) ESE (102°) from Loma Linda, CA
10 km (6 miles) SSE (162°) from Highland, CA
13 km (8 miles) NNE (24°) from Moreno Valley, CA
99 km (62 miles) E (91°) from Los Angeles Civic Center, CA

Event ID ci14286244
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 15, 2007

24 Hour Peak Crustal Resonant Frequency = 0.59 Hz (-66.97 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 2007/04/15 02:08:39 -21.555 -68.221 132.5 ANTOFAGASTA, CHILE

ML1.5 2007/04/15 01:29:39 36.743 -121.338 8.2 5 km ( 3 mi) SSW of Tres Pinos, CA
ML2.4 2007/04/15 00:33:11 36.790 -113.861 5.7 20 km ( 12 mi) E of Mesquite, NV
ML1.1 2007/04/15 00:09:25 36.740 -121.339 7.3 6 km ( 4 mi) SSW of Tres Pinos, 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

ML1.7 2007/04/15 05:47:28 36.038 -117.813 0.0 12 km ( 8 mi) E of Coso Junction, CA
ML1.3 2007/04/15 04:47:48 37.517 -117.584 0.0 18 km ( 11 mi) NE of Sylvania, NV
ML2.3 2007/04/15 04:47:31 37.974 -118.720 7.8 35 km ( 22 mi) E of Lee Vining, CA
ML1.4 2007/04/15 04:28:48 33.730 -116.747 18.5 4 km ( 2 mi) WSW of Idyllwild, CA
ML1.1 2007/04/15 04:20:24 33.931 -116.345 4.8 13 km ( 8 mi) NNE of Thousand Palms, CA

M5.8 2007/04/15 04:12:26 46.993 153.410 10.0 KURIL ISLANDS
M4.7 2007/04/15 03:56:08 32.147 49.409 10.0 WESTERN IRAN

ML1.6 2007/04/15 03:29:30 32.943 -116.234 9.0 24 km ( 15 mi) SSW of Ocotillo Wells, CA
ML1.2 2007/04/15 03:20:02 36.744 -121.331 7.4 5 km ( 3 mi) S of Tres Pinos, CA

M5.4 2007/04/15 03:19:30 34.783 136.275 15.5 WESTERN HONSHU, JAPAN

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

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

ML1.6 2007/04/15 11:51:13 38.836 -122.805 1.8 4 km ( 3 mi) N of The Geysers, CA
ML1.1 2007/04/15 10:52:11 35.711 -121.024 9.0 13 km ( 8 mi) WSW of Lake Nacimiento, CA

M5.2 2007/04/15 10:42:11 1.206 126.333 10.0 MOLUCCA SEA

ML1.8 2007/04/15 10:41:06 33.216 -116.087 11.9 9 km ( 6 mi) NNE of Ocotillo Wells, CA
ML2.0 2007/04/15 10:40:46 38.803 -122.773 1.7 3 km ( 2 mi) E of The Geysers, CA

M4.4 2007/04/15 10:36:19 -16.084 -175.415 325.4 TONGA
M4.7 2007/04/15 09:34:53 35.185 136.363 42.7 WESTERN HONSHU, JAPAN

ML1.7 2007/04/15 09:11:20 38.827 -122.805 2.8 3 km ( 2 mi) N of The Geysers, CA
ML2.6 2007/04/15 09:08:43 38.821 -122.810 3.6 3 km ( 2 mi) N of The Geysers, 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 2007/04/15 14:53:45 39.470 -123.104 4.1 14 km ( 9 mi) WNW of Lake Pillsbury, CA

ML3.1 2007/04/15 14:27:49 39.482 -123.107 3.2 15 km ( 9 mi) WNW of Lake Pillsbury, CA

M5.0 2007/04/15 14:25:57 3.089 126.885 10.0 KEPULAUAN TALAUD, INDONESIA

ML1.1 2007/04/15 14:10:20 37.413 -117.079 8.0 20 km ( 13 mi) NE of Tokop, NV

M5.2 2007/04/15 13:59:35 39.390 72.788 50.6 KYRGYZSTAN

ML1.7 2007/04/15 13:15:18 37.478 -118.840 3.7 17 km ( 11 mi) WSW of Toms Place, 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

ML2.8 2007/04/15 17:56:00 40.673 -124.813 1.3 48 km ( 30 mi) WNW of Ferndale, CA
ML1.2 2007/04/15 17:43:39 36.073 -117.740 2.2 19 km ( 12 mi) E of Coso Junction, CA
ML1.2 2007/04/15 17:31:29 38.805 -122.800 0.3 1 km ( 1 mi) NE of The Geysers, CA
ML1.3 2007/04/15 17:23:07 36.744 -121.341 8.5 5 km ( 3 mi) SSW of Tres Pinos, CA
ML1.2 2007/04/15 17:05:12 37.250 -122.034 1.9 3 km ( 2 mi) SSW of Saratoga, CA
ML1.1 2007/04/15 16:57:57 33.173 -115.664 1.3 3 km ( 2 mi) W of Obsidian Butte, CA
ML1.6 2007/04/15 16:27:25 37.437 -121.790 6.5 8 km ( 5 mi) NNE of Alum Rock, CA
ML1.1 2007/04/15 16:21:11 34.051 -117.244 17.7 1 km ( 0 mi) ENE of Loma Linda, CA
ML1.8 2007/04/15 15:10:36 33.223 -116.094 10.1 10 km ( 6 mi) NNE of Ocotillo Wells, 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 2007/04/15 20:42:03 38.806 -122.772 2.5 3 km ( 2 mi) ENE of The Geysers, CA
ML2.2 2007/04/15 19:43:33 36.745 -121.343 8.4 5 km ( 3 mi) SSW of Tres Pinos, CA
ML1.7 2007/04/15 19:42:50 35.340 -118.505 4.4 13 km ( 8 mi) NNE of Keene, CA
ML1.6 2007/04/15 19:28:32 38.795 -122.763 2.1 4 km ( 2 mi) E of The Geysers, CA
ML1.6 2007/04/15 19:06:56 36.443 -121.019 5.0 15 km ( 9 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

ML1.8 2007/04/15 23:59:55 32.694 -116.045 10.2 7 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/15 23:58:09 32.697 -116.036 9.3 6 km ( 4 mi) SW of Ocotillo, CA
ML2.0 2007/04/15 23:48:35 35.581 -120.930 5.3 15 km ( 9 mi) ENE of Cambria, CA
ML1.6 2007/04/15 23:41:08 32.690 -116.037 9.9 7 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/15 23:34:09 35.050 -117.669 0.0 4 km ( 2 mi) N of Boron, CA
ML1.7 2007/04/15 23:33:29 32.688 -116.048 9.5 7 km ( 5 mi) SW of Ocotillo, CA
ML2.0 2007/04/15 23:13:13 32.689 -116.050 8.9 8 km ( 5 mi) SW of Ocotillo, CA
ML1.2 2007/04/15 23:10:43 36.124 -117.912 5.5 9 km ( 6 mi) NNE of Coso Junction, CA
ML2.8 2007/04/15 23:06:47 40.357 -124.404 18.1 11 km ( 7 mi) WNW of Petrolia, CA
ML2.0 2007/04/15 23:00:04 32.691 -116.045 9.7 7 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/15 22:59:29 32.691 -116.025 6.0 6 km ( 4 mi) SSW of Ocotillo, CA
ML2.5 2007/04/15 22:58:41 32.697 -116.028 6.0 6 km ( 3 mi) SSW of Ocotillo, CA

ML4.3 2007/04/15 22:57:26 32.692 -116.056 8.0 8 km ( 5 mi) SW of Ocotillo, CA

ML2.3 2007/04/15 22:26:55 36.131 -117.921 2.0 10 km ( 6 mi) NNE of Coso Junction, CA

M4.8 2007/04/15 22:20:15 39.457 74.857 51.1 SOUTHERN XINJIANG, CHINA

ML2.7 2007/04/15 22:18:00 40.394 -124.368 26.8 10 km ( 6 mi) NW of Petrolia, CA
ML1.4 2007/04/15 21:06:50 37.453 -118.824 9.0 18 km ( 11 mi) SW of Toms Place, CA

April 16, 2007

24 Hour Peak Crustal Resonant Frequency = 0.54 Hz (-66.48 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 2007/04/16 02:57:34 32.688 -116.035 9.2 7 km ( 4 mi) SSW of Ocotillo, CA
ML1.5 2007/04/16 02:52:03 34.003 -116.381 4.9 13 km ( 8 mi) ENE of Desert Hot Springs, CA
ML1.7 2007/04/16 01:47:25 32.694 -116.041 9.2 7 km ( 4 mi) SW of Ocotillo, CA
ML2.1 2007/04/16 01:35:57 33.955 -117.749 14.5 3 km ( 2 mi) SW of Chino Hills, CA
ML1.9 2007/04/16 01:29:52 32.696 -116.055 9.8 7 km ( 5 mi) SW of Ocotillo, CA
ML1.4 2007/04/16 01:27:11 32.699 -116.041 9.3 6 km ( 4 mi) SW of Ocotillo, CA

M5.8 2007/04/16 01:24:08 -63.291 169.855 10.0 BALLENY ISLANDS REGION

ML1.5 2007/04/16 01:03:03 40.325 -121.379 6.0 12 km ( 8 mi) WNW of Chester, CA

M5.1 2007/04/16 00:55:05 27.480 141.593 44.2 BONIN ISLANDS, JAPAN REGION

ML1.9 2007/04/16 00:37:18 32.695 -116.046 9.1 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/16 00:26:16 38.830 -122.871 2.2 7 km ( 4 mi) WNW of The Geysers, CA
ML2.7 2007/04/16 00:23:24 38.828 -122.868 3.2 6 km ( 4 mi) WNW of The Geysers, CA
ML1.4 2007/04/16 00:22:39 38.827 -122.870 2.0 6 km ( 4 mi) WNW of The Geysers, CA
ML1.3 2007/04/16 00:16:43 35.925 -117.950 4.8 13 km ( 8 mi) S of Coso Junction, CA
ML1.2 2007/04/16 00:12:46 36.131 -117.908 5.0 10 km ( 6 mi) NNE of Coso Junction, 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

ML1.1 2007/04/16 05:38:07 35.490 -118.401 4.5 17 km ( 11 mi) SSE of town of Lake Isabella, CA
ML1.0 2007/04/16 05:21:38 38.078 -122.243 11.8 3 km ( 2 mi) NNW of Crockett, CA
ML1.3 2007/04/16 05:15:15 38.826 -122.795 3.8 3 km ( 2 mi) NNE of The Geysers, CA
ML1.6 2007/04/16 05:08:56 32.691 -116.040 10.3 7 km ( 4 mi) SW of Ocotillo, CA
ML1.1 2007/04/16 04:14:01 33.284 -116.633 18.2 13 km ( 8 mi) ENE of Lake Henshaw, CA
ML2.5 2007/04/16 03:45:24 32.682 -116.058 12.4 9 km ( 5 mi) SW of Ocotillo, CA
ML1.4 2007/04/16 03:01:09 33.165 -116.065 4.1 7 km ( 4 mi) ENE of Ocotillo Wells, 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

ML1.7 2007/04/16 08:01:28 37.990 -118.743 7.2 33 km ( 21 mi) E of Lee Vining, CA
ML1.8 2007/04/16 07:46:34 38.758 -122.720 2.7 3 km ( 2 mi) SW of Anderson Springs, CA

M4.9 2007/04/16 07:38:55 41.129 20.042 20.6 ALBANIA

ML1.7 2007/04/16 07:34:52 32.695 -116.047 9.9 7 km ( 4 mi) SW of Ocotillo, CA
ML1.3 2007/04/16 07:05:52 32.710 -116.034 4.4 5 km ( 3 mi) SW of Ocotillo, CA

ML3.0 2007/04/16 06:50:31 40.583 -100.758 5.0 14 km ( 9 mi) SW of Maywood, NE

ML1.6 2007/04/16 06:36:21 32.686 -116.053 9.0 8 km ( 5 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

ML1.0 2007/04/16 11:00:47 33.918 -116.350 5.6 12 km ( 7 mi) NNE of Thousand Palms, CA

M4.8 2007/04/16 10:51:58 -7.046 155.754 10.0 SOLOMON ISLANDS

ML1.6 2007/04/16 10:48:02 35.467 -118.318 5.8 20 km ( 12 mi) S of Weldon, CA
ML1.5 2007/04/16 10:32:56 32.698 -116.045 8.5 6 km ( 4 mi) SW of Ocotillo, CA
ML2.8 2007/04/16 10:26:05 32.041 -115.717 5.6 63 km ( 39 mi) WSW of Guadalupe Victoria, Mexico
ML1.5 2007/04/16 10:20:58 32.690 -116.051 9.6 7 km ( 5 mi) SW of Ocotillo, CA
ML1.9 2007/04/16 09:49:04 39.393 -121.499 5.0 6 km ( 4 mi) SSE of Palermo, CA
ML1.4 2007/04/16 09:44:14 32.700 -116.042 8.3 6 km ( 4 mi) SW of Ocotillo, CA

M4.9 2007/04/16 09:04:54 27.486 129.295 30.0 RYUKYU ISLANDS, JAPAN

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 2007/04/16 14:48:10 35.876 -117.720 8.8 27 km ( 17 mi) NNE of Inyokern, CA

ML4.2 2007/04/16 14:45:17 19.048 -64.584 34.3 45 km ( 28 mi) NW of Settlement, British Virgin Islands

ML1.7 2007/04/16 14:39:52 38.825 -122.798 4.4 3 km ( 2 mi) NNE of The Geysers, CA
ML1.7 2007/04/16 14:23:51 36.745 -121.340 7.6 5 km ( 3 mi) SSW of Tres Pinos, CA

6.4 2007/04/16 13:20:38 -57.953 147.637 10.0 WEST OF MACQUARIE ISLAND

ML1.6 2007/04/16 13:17:29 33.182 -116.658 17.0 10 km ( 6 mi) E of Mesa Grande, CA
ML1.8 2007/04/16 13:03:03 33.484 -116.486 15.6 19 km ( 12 mi) ESE of Anza, CA
ML1.8 2007/04/16 13:02:58 33.471 -116.483 15.4 20 km ( 12 mi) ESE of Anza, CA
ML1.5 2007/04/16 12:43:33 32.701 -116.046 8.9 6 km ( 4 mi) SW of Ocotillo, CA
ML1.7 2007/04/16 12:40:08 36.745 -121.335 8.5 5 km ( 3 mi) SSW of Tres Pinos, CA
ML1.4 2007/04/16 12:20:08 32.692 -116.047 7.5 7 km ( 4 mi) SW of Ocotillo, 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

ML1.5 2007/04/16 17:23:54 33.230 -116.762 6.6 1 km ( 1 mi) S of Lake Henshaw, CA

M4.4 2007/04/16 17:02:56 20.488 96.078 29.7 MYANMAR
M5.2 2007/04/16 15:50:08 -21.162 -174.601 10.0 TONGA

ML1.9 2007/04/16 15:32:11 39.065 -122.919 1.9 2 km ( 1 mi) N of Lakeport, CA

ML3.8 2007/04/16 15:02:21 19.004 -64.381 76.2 31 km ( 19 mi) NNW of Settlement, British Virgin Islands

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 2007/04/16 20:50:28 32.693 -116.035 9.1 6 km ( 4 mi) SW of Ocotillo, CA
ML2.3 2007/04/16 20:26:52 40.710 -124.148 11.8 4 km ( 2 mi) SSE of Pine Hills, CA
ML1.5 2007/04/16 19:56:13 33.956 -116.931 20.0 4 km ( 3 mi) NW of Banning, CA
ML2.1 2007/04/16 19:18:53 35.637 -120.753 7.0 7 km ( 4 mi) W of Paso Robles, CA
ML1.6 2007/04/16 19:15:20 33.178 -116.429 13.8 9 km ( 6 mi) SW of Borrego Springs, CA
ML1.1 2007/04/16 18:29:44 33.965 -116.656 9.7 12 km ( 7 mi) ENE of Cabazon, 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

ML1.1 2007/04/16 23:43:17 33.494 -116.701 38.0 7 km ( 5 mi) SSW of Anza, CA
ML2.0 2007/04/16 23:27:39 35.925 -117.951 5.2 13 km ( 8 mi) S of Coso Junction, CA
ML1.9 2007/04/16 23:16:55 37.256 -122.027 3.8 2 km ( 1 mi) SSW of Saratoga, CA
ML1.1 2007/04/16 22:48:44 36.710 -121.385 5.8 11 km ( 7 mi) SSW of Tres Pinos, CA
ML1.9 2007/04/16 22:22:24 37.180 -121.578 3.0 8 km ( 5 mi) NE of Morgan Hill, CA
ML1.9 2007/04/16 21:26:20 37.255 -122.028 3.6 2 km ( 1 mi) SSW of Saratoga, CA
ML1.7 2007/04/16 21:07:44 34.022 -117.165 14.6 4 km ( 2 mi) S of Redlands, CA

April 17, 2007

24 Hour Peak Crustal Resonant Frequency = 0.54 Hz (-66.09 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

ML1.3 2007/04/17 02:49:53 39.430 -119.858 12.0 11 km ( 7 mi) SSW of Reno, NV
ML1.9 2007/04/17 02:15:25 32.681 -116.055 6.9 8 km ( 5 mi) SW of Ocotillo, CA
ML1.9 2007/04/17 01:24:45 32.685 -116.053 10.0 8 km ( 5 mi) SW of Ocotillo, CA
ML1.8 2007/04/17 00:41:22 32.582 -116.776 2.8 14 km ( 9 mi) W of Tecate, Mexico

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 2007/04/17 05:51:00 34.567 -118.049 9.3 5 km ( 3 mi) ESE of Palmdale, CA
ML1.6 2007/04/17 05:46:14 32.691 -116.046 8.2 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/17 05:25:59 33.712 -116.717 19.6 4 km ( 2 mi) S of Idyllwild, CA
ML2.3 2007/04/17 05:25:04 32.687 -116.058 4.4 8 km ( 5 mi) SW of Ocotillo, CA
ML2.2 2007/04/17 05:10:56 35.834 -117.803 4.2 21 km ( 13 mi) N of Inyokern, CA
ML2.0 2007/04/17 04:45:11 33.299 -116.254 11.0 12 km ( 8 mi) ENE of Borrego Springs, CA
ML1.8 2007/04/17 04:21:48 34.844 -118.952 14.1 2 km ( 1 mi) N of Frazier Park, CA
ML1.6 2007/04/17 03:56:43 32.696 -116.043 10.4 7 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/17 03:52:00 36.650 -114.837 0.0 21 km ( 13 mi) WSW of Moapa Town, NV
ML1.5 2007/04/17 03:20:29 32.703 -116.047 9.6 6 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/17 03:19:52 32.697 -116.047 9.2 7 km ( 4 mi) SW of Ocotillo, CA

M5.3 2007/04/17 03:16:02 -31.702 179.790 385.8 KERMADEC ISLANDS REGION

ML1.4 2007/04/17 03:02:05 39.401 -120.162 10.3 8 km ( 5 mi) NNE of Truckee, 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

ML1.0 2007/04/17 08:47:31 33.444 -116.556 11.6 16 km ( 10 mi) SE of Anza, CA
ML2.3 2007/04/17 08:31:54 33.010 -116.263 7.1 19 km ( 12 mi) SW of Ocotillo Wells, CA
ML1.6 2007/04/17 07:32:54 36.744 -121.336 7.5 5 km ( 3 mi) SSW of Tres Pinos, CA

ML3.2 2007/04/17 07:29:45 36.745 -121.337 8.4 5 km ( 3 mi) SSW of Tres Pinos, CA

ML1.0 2007/04/17 07:16:53 35.926 -117.907 7.9 14 km ( 9 mi) SSE of Coso Junction, CA
ML1.3 2007/04/17 06:59:28 35.678 -121.084 7.5 10 km ( 6 mi) ENE of San Simeon, CA

ML3.5 2007/04/17 06:31:02 18.543 -65.168 25.1 30 km ( 19 mi) NNE of Culebra, PR

ML1.5 2007/04/17 06:20:12 33.165 -116.119 8.2 3 km ( 2 mi) NNE of Ocotillo Wells, CA

M5.2 2007/04/17 06:20:12 -4.530 152.247 140.3 NEW BRITAIN REGION, PAPUA NEW GUINEA

ML1.5 2007/04/17 06:10:09 33.984 -116.790 15.3 9 km ( 5 mi) NNW of Cabazon, 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

ML1.8 2007/04/17 10:43:15 32.683 -116.048 9.2 8 km ( 5 mi) SW of Ocotillo, CA
ML1.3 2007/04/17 10:35:45 32.694 -116.047 9.6 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/17 10:07:33 37.716 -117.354 0.0 7 km ( 5 mi) W of West Spring, NV
ML1.5 2007/04/17 09:56:05 33.230 -116.252 12.3 11 km ( 7 mi) E of Borrego Springs, CA
ML1.1 2007/04/17 09:48:19 39.409 -119.935 0.0 12 km ( 7 mi) S of Verdi-Mogul, NV
ML1.4 2007/04/17 09:03:09 32.712 -116.044 5.1 5 km ( 3 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

ML1.4 2007/04/17 14:59:03 32.683 -115.713 4.8 12 km ( 8 mi) S of Seeley, CA
ML2.1 2007/04/17 14:43:14 36.744 -121.343 8.4 5 km ( 3 mi) SSW of Tres Pinos, CA
ML2.1 2007/04/17 14:42:18 36.675 -121.299 4.0 13 km ( 8 mi) S of Tres Pinos, CA
ML1.4 2007/04/17 14:25:28 32.699 -116.039 7.6 6 km ( 4 mi) SW of Ocotillo, CA
ML1.7 2007/04/17 14:07:22 36.478 -120.882 11.7 20 km ( 12 mi) WNW of New Idria, CA
ML2.1 2007/04/17 13:01:02 32.687 -116.055 9.0 8 km ( 5 mi) SW of Ocotillo, CA
ML1.1 2007/04/17 12:53:07 32.698 -116.038 9.1 6 km ( 4 mi) SW of Ocotillo, CA
ML1.4 2007/04/17 12:25:22 32.694 -116.042 8.4 7 km ( 4 mi) SW of Ocotillo, 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

ML1.3 2007/04/17 17:53:33 32.695 -116.036 10.3 6 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/17 17:13:24 34.944 -117.607 0.0 9 km ( 6 mi) SSE of Boron, CA
ML1.3 2007/04/17 17:11:50 36.742 -121.338 6.8 6 km ( 3 mi) SSW of Tres Pinos, CA
ML1.0 2007/04/17 16:44:06 32.706 -116.025 6.4 5 km ( 3 mi) SW of Ocotillo, CA

M4.6 2007/04/17 16:13:19 29.619 130.551 62.0 RYUKYU ISLANDS, JAPAN

ML2.0 2007/04/17 15:54:59 32.696 -116.043 5.4 7 km ( 4 mi) SW of Ocotillo, CA
ML2.0 2007/04/17 15:40:01 36.744 -121.343 8.2 6 km ( 3 mi) SSW of Tres Pinos, 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 2007/04/17 20:59:57 37.594 -122.385 13.2 2 km ( 1 mi) ESE of Millbrae, CA
ML1.2 2007/04/17 19:45:43 32.696 -116.046 10.5 7 km ( 4 mi) SW of Ocotillo, CA

ML3.0 2007/04/17 19:39:11 19.185 -64.709 14.1 65 km ( 40 mi) NW of Settlement, British Virgin Islands

ML1.8 2007/04/17 19:12:01 36.739 -121.336 8.7 6 km ( 4 mi) SSW of Tres Pinos, CA
ML1.5 2007/04/17 18:49:24 36.715 -121.383 7.3 10 km ( 6 mi) SW of Tres Pinos, CA
ML1.5 2007/04/17 18:19:28 35.087 -118.761 8.0 11 km ( 7 mi) W of Stallion Springs, CA
ML1.2 2007/04/17 18:03:51 38.770 -122.812 18.6 3 km ( 2 mi) S of The Geysers, CA
ML1.7 2007/04/17 18:00:18 39.439 -123.103 4.9 13 km ( 8 mi) WNW of Lake Pillsbury, 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

ML2.0 2007/04/17 23:03:42 32.458 -115.244 9.1 23 km ( 14 mi) NW of Guadalupe Victoria, Mexico
ML1.4 2007/04/17 23:02:33 36.507 -121.095 4.5 5 km ( 3 mi) ESE of Pinnacles, CA
ML2.9 2007/04/17 22:31:23 34.162 -117.423 11.4 7 km ( 4 mi) NW of Rialto, CA
ML1.5 2007/04/17 22:26:06 35.751 -118.399 9.0 3 km ( 2 mi) ENE of Kernville, CA
ML1.2 2007/04/17 21:43:49 33.822 -116.920 21.0 6 km ( 4 mi) NE of San Jacinto, CA

April 18, 2007

24 Hour Peak Crustal Resonant Frequency = 0.54 Hz (-66.09 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

ML3.0 2007/04/18 02:47:01 34.132 -117.475 5.7 4 km ( 3 mi) NNW of Fontana, CA

ML2.4 2007/04/18 02:40:57 32.691 -116.049 8.0 7 km ( 5 mi) SW of Ocotillo, CA
ML2.4 2007/04/18 02:40:32 37.533 -118.816 5.7 12 km ( 8 mi) WSW of Toms Place, CA
ML1.6 2007/04/18 01:31:21 34.100 -117.308 9.4 4 km ( 2 mi) SSW of San Bernardino, CA
ML2.2 2007/04/18 01:27:25 36.866 -121.596 5.9 5 km ( 3 mi) ESE of Aromas, CA

M5.3 2007/04/18 01:08:14 -23.838 -66.546 219.2 JUJUY, ARGENTINA

ML2.2 2007/04/18 00:45:48 37.531 -118.815 5.5 12 km ( 8 mi) WSW of Toms Place, CA
ML1.1 2007/04/18 00:36:41 35.045 -117.646 0.0 4 km ( 2 mi) NNE of Boron, CA
ML1.3 2007/04/18 00:30:38 34.029 -116.690 5.0 10 km ( 6 mi) WSW of Morongo Valley, CA
ML1.6 2007/04/18 00:00:40 32.714 -116.035 9.5 5 km ( 3 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 2007/04/18 05:51:41 32.361 -115.202 7.0 12 km ( 7 mi) NW of Guadalupe Victoria, Mexico
ML1.9 2007/04/18 05:37:27 32.694 -116.060 8.6 8 km ( 5 mi) SW of Ocotillo, CA
ML1.0 2007/04/18 05:36:45 36.000 -120.571 1.9 17 km ( 10 mi) NW of Parkfield, CA

ML3.4 2007/04/18 05:33:12 18.505 -68.351 126.9 40 km ( 25 mi) ESE of Higüey, Dominican Republic

ML1.3 2007/04/18 05:31:39 32.699 -116.043 8.8 6 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/18 05:22:07 32.690 -116.042 10.4 7 km ( 4 mi) SW of Ocotillo, CA
ML1.3 2007/04/18 05:18:07 32.695 -116.057 8.1 7 km ( 5 mi) SW of Ocotillo, CA
ML2.1 2007/04/18 05:08:10 32.693 -116.055 8.5 7 km ( 5 mi) SW of Ocotillo, CA
ML1.8 2007/04/18 03:53:12 37.531 -118.815 5.3 12 km ( 8 mi) WSW of Toms Place, CA
ML1.6 2007/04/18 03:34:32 34.129 -117.477 5.6 4 km ( 2 mi) NNW of Fontana, CA
ML1.2 2007/04/18 03:28:43 37.530 -118.820 5.7 13 km ( 8 mi) WSW of Toms Place, CA
ML1.8 2007/04/18 03:26:47 38.823 -122.795 3.7 3 km ( 2 mi) NNE of The Geysers, CA
ML1.4 2007/04/18 03:08:05 34.131 -117.476 5.3 4 km ( 3 mi) NNW of Fontana, 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

ML2.6 2007/04/18 08:56:14 39.472 -123.108 4.8 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.2 2007/04/18 08:53:25 39.477 -123.107 4.7 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.0 2007/04/18 08:53:19 37.633 -121.692 6.9 9 km ( 5 mi) SE of Livermore, CA
ML2.4 2007/04/18 08:51:11 39.465 -123.108 1.4 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/18 08:47:31 37.644 -121.675 7.1 9 km ( 6 mi) ESE of Livermore, CA

ML4.8 2007/04/18 08:42:22 39.465 -123.106 6.1 14 km ( 9 mi) WNW of Lake Pillsbury, CA

ML1.4 2007/04/18 08:30:56 33.950 -116.773 16.3 5 km ( 3 mi) N of Cabazon, CA
ML1.1 2007/04/18 07:45:46 33.890 -116.316 5.6 10 km ( 6 mi) NE of Thousand Palms, CA
ML1.4 2007/04/18 07:04:13 32.700 -116.048 9.8 6 km ( 4 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

ML1.3 2007/04/18 11:54:30 36.745 -121.338 7.7 5 km ( 3 mi) SSW of Tres Pinos, CA
ML2.0 2007/04/18 11:48:22 36.745 -121.341 8.4 5 km ( 3 mi) SSW of Tres Pinos, CA
ML1.3 2007/04/18 11:47:50 34.093 -117.315 9.8 3 km ( 2 mi) N of Colton, CA
ML1.6 2007/04/18 11:46:13 32.694 -116.046 10.0 7 km ( 4 mi) SW of Ocotillo, CA
ML1.4 2007/04/18 11:42:16 32.700 -116.050 8.8 7 km ( 4 mi) SW of Ocotillo, CA
ML1.8 2007/04/18 11:42:13 39.467 -123.109 1.6 15 km ( 9 mi) WNW of Lake Pillsbury, CA

ML4.0 2007/04/18 11:16:59 34.769 -121.410 0.6 69 km ( 43 mi) WSW of Pt. Sal, CA

ML2.5 2007/04/18 11:03:17 37.530 -118.817 5.3 13 km ( 8 mi) WSW of Toms Place, CA
ML1.6 2007/04/18 10:54:26 32.695 -116.069 4.2 8 km ( 5 mi) SW of Ocotillo, CA
ML2.1 2007/04/18 10:51:53 39.474 -123.108 4.0 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/18 10:46:33 39.460 -123.117 1.2 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/18 10:32:18 39.461 -123.110 2.6 14 km ( 9 mi) WNW of Lake Pillsbury, CA

ML3.4 2007/04/18 10:29:57 19.031 -67.654 10.0 85 km ( 53 mi) NW of Aguadilla, PR

ML1.9 2007/04/18 10:25:09 39.450 -123.113 1.4 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/18 10:22:35 34.102 -117.978 13.5 2 km ( 1 mi) SW of Irwindale, CA
ML2.6 2007/04/18 10:15:46 32.696 -116.050 8.5 7 km ( 4 mi) SW of Ocotillo, CA
ML1.8 2007/04/18 10:06:02 39.469 -123.114 1.5 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/18 10:02:49 39.479 -123.110 1.2 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/18 09:53:26 32.697 -116.043 10.1 6 km ( 4 mi) SW of Ocotillo, CA
ML2.2 2007/04/18 09:51:12 38.817 -122.793 4.2 2 km ( 1 mi) NNE of The Geysers, CA
ML1.2 2007/04/18 09:50:48 38.859 -122.811 1.2 7 km ( 4 mi) N of The Geysers, CA
ML2.2 2007/04/18 09:42:30 39.474 -123.102 1.3 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.8 2007/04/18 09:33:37 32.677 -116.059 9.6 9 km ( 6 mi) SW of Ocotillo, CA
ML1.7 2007/04/18 09:30:56 39.444 -123.107 0.9 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.1 2007/04/18 09:26:22 39.473 -123.110 4.4 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.3 2007/04/18 09:11:09 36.039 -117.512 6.3 27 km ( 16 mi) SSE of Darwin, CA
ML1.0 2007/04/18 09:10:41 36.042 -117.509 7.1 26 km ( 16 mi) SSE of Darwin, 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

ML1.9 2007/04/18 14:37:27 39.465 -123.119 0.9 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.4 2007/04/18 13:57:45 38.830 -122.792 1.9 4 km ( 2 mi) NNE of The Geysers, CA
ML1.6 2007/04/18 13:39:53 39.469 -123.113 1.4 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/18 13:35:06 39.473 -123.114 4.8 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.0 2007/04/18 13:34:09 39.479 -123.107 5.6 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/18 12:52:13 37.971 -118.724 7.9 35 km ( 22 mi) E of Lee Vining, CA
ML1.9 2007/04/18 12:46:03 38.830 -122.869 1.6 6 km ( 4 mi) WNW of The Geysers, CA
ML2.3 2007/04/18 12:00:28 39.456 -123.106 3.9 14 km ( 9 mi) WNW of Lake Pillsbury, 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

ML1.3 2007/04/18 17:54:34 37.539 -118.858 10.4 15 km ( 9 mi) SE of Mammoth Lakes, CA
ML2.2 2007/04/18 17:37:32 39.443 -123.102 3.0 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/18 17:31:42 39.439 -123.099 5.9 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.3 2007/04/18 17:25:49 32.695 -116.047 7.1 7 km ( 4 mi) SW of Ocotillo, CA

M4.8 2007/04/18 17:20:17 26.180 128.656 10.0 RYUKYU ISLANDS, JAPAN

ML2.0 2007/04/18 16:51:30 39.481 -123.106 5.0 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/18 16:41:20 39.480 -123.108 4.3 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.0 2007/04/18 15:23:35 39.470 -123.114 4.4 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/18 15:23:17 38.801 -122.744 0.0 4 km ( 3 mi) SSW of Cobb, CA

M5.5 2007/04/18 15:07:32 42.677 141.926 121.0 HOKKAIDO, JAPAN REGION

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 2007/04/18 20:33:23 32.610 -116.991 0.0 6 km ( 4 mi) ESE of Chula Vista, CA
ML1.6 2007/04/18 20:25:52 36.745 -121.344 8.6 5 km ( 3 mi) SSW of Tres Pinos, CA
ML1.1 2007/04/18 20:20:09 36.746 -121.345 7.5 5 km ( 3 mi) SSW of Tres Pinos, CA
ML1.7 2007/04/18 20:16:27 39.471 -123.110 1.6 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.1 2007/04/18 20:12:17 34.809 -116.691 0.0 32 km ( 20 mi) ESE of Barstow, CA
ML2.2 2007/04/18 19:36:26 39.444 -123.106 2.7 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/18 19:20:41 35.566 -120.889 7.7 14 km ( 9 mi) N of Cayucos, CA
ML2.2 2007/04/18 19:12:12 39.458 -123.102 5.0 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/18 19:08:49 36.956 -121.555 0.0 7 km ( 4 mi) SSE of Gilroy, CA
ML2.1 2007/04/18 18:38:53 38.835 -122.806 2.4 4 km ( 3 mi) N of The Geysers, CA
ML1.9 2007/04/18 18:37:19 36.238 -120.811 5.7 22 km ( 14 mi) ENE of San Lucas, 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

ML2.1 2007/04/18 23:55:06 39.469 -123.099 1.1 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.3 2007/04/18 23:30:01 39.469 -123.111 4.4 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/18 23:26:23 35.047 -117.672 0.0 4 km ( 2 mi) NNW of Boron, CA
ML1.5 2007/04/18 23:13:39 37.195 -117.409 0.0 18 km ( 11 mi) SW of Tokop, NV
ML1.4 2007/04/18 23:10:56 32.694 -116.040 9.4 7 km ( 4 mi) SW of Ocotillo, CA
ML2.6 2007/04/18 23:06:31 39.438 -123.103 5.9 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/18 22:35:21 32.659 -115.627 14.2 12 km ( 8 mi) W of Calexico, CA

ML3.5 2007/04/18 22:23:12 33.448 -116.594 11.3 14 km ( 9 mi) SSE of Anza, CA

ML1.7 2007/04/18 22:20:36 32.634 -115.632 11.0 13 km ( 8 mi) WSW of Calexico, CA
ML1.8 2007/04/18 22:18:32 32.628 -115.626 7.1 13 km ( 8 mi) WSW of Calexico, CA
ML1.2 2007/04/18 22:10:55 37.632 -121.691 7.1 9 km ( 5 mi) SE of Livermore, CA
ML1.6 2007/04/18 22:09:19 37.621 -121.662 6.4 12 km ( 7 mi) SE of Livermore, CA
ML1.0 2007/04/18 21:53:08 36.010 -117.805 2.2 13 km ( 8 mi) ESE of Coso Junction, CA
ML2.4 2007/04/18 21:48:38 34.507 -118.097 12.9 8 km ( 5 mi) S of Palmdale, CA
ML2.2 2007/04/18 21:26:01 38.776 -122.724 1.9 3 km ( 2 mi) W of Anderson Springs, CA
ML1.5 2007/04/18 21:11:44 34.850 -118.768 0.0 10 km ( 6 mi) NE of Gorman, CA

April 19, 2007

24 Hour Peak Crustal Resonant Frequency = 0.53 Hz (-66.10 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

ML1.9 2007/04/19 02:43:57 32.698 -116.053 6.9 7 km ( 4 mi) SW of Ocotillo, CA
ML1.6 2007/04/19 01:56:54 39.452 -123.101 6.6 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/19 01:39:51 33.828 -117.003 10.4 6 km ( 4 mi) NW of San Jacinto, CA
ML1.9 2007/04/19 01:34:55 32.694 -116.057 2.1 8 km ( 5 mi) SW of Ocotillo, CA

ML4.2 2007/04/19 01:32:37 17.272 -99.322 81.7 GUERRERO, MEXICO

ML2.0 2007/04/19 00:44:28 37.972 -118.725 8.2 35 km ( 22 mi) E of Lee Vining, CA
ML1.9 2007/04/19 00:33:02 33.452 -116.591 12.3 14 km ( 8 mi) SSE of Anza, CA
ML1.5 2007/04/19 00:21:49 39.446 -123.103 1.7 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/19 00:18:24 39.452 -123.108 1.3 14 km ( 9 mi) WNW of Lake Pillsbury, 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 2007/04/19 05:21:20 35.365 -118.090 5.0 30 km ( 19 mi) NW of California City, CA
ML1.1 2007/04/19 04:45:51 32.696 -116.041 7.3 6 km ( 4 mi) SW of Ocotillo, CA
ML2.0 2007/04/19 04:16:57 38.821 -122.790 4.6 3 km ( 2 mi) NNE of The Geysers, CA
ML1.9 2007/04/19 04:01:55 39.442 -123.104 3.7 13 km ( 8 mi) WNW of Lake Pillsbury, CA

ML3.3 2007/04/19 03:52:44 39.443 -123.108 5.4 13 km ( 8 mi) WNW of Lake Pillsbury, CA

ML2.3 2007/04/19 03:48:58 39.474 -123.110 3.4 15 km ( 9 mi) WNW of Lake Pillsbury, CA

M4.9 2007/04/19 03:26:01 -17.117 -174.459 155.7 TONGA

ML2.2 2007/04/19 03:22:20 39.450 -123.109 4.6 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/19 03:11:48 39.441 -123.105 2.9 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/19 03:11:34 39.460 -123.106 6.0 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.2 2007/04/19 03:05:34 36.634 -121.245 5.1 15 km ( 9 mi) NW of Pinnacles, CA
ML2.1 2007/04/19 03:02:01 37.612 -119.445 2.0 19 km ( 12 mi) SE of Yosemite Valley, 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

ML1.7 2007/04/19 08:44:15 32.699 -116.059 9.1 7 km ( 5 mi) SW of Ocotillo, CA
ML1.8 2007/04/19 08:09:15 39.447 -123.108 1.6 14 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.5 2007/04/19 07:46:51 35.858 -120.406 5.5 5 km ( 3 mi) SSE of Parkfield, CA
ML1.4 2007/04/19 07:22:23 38.823 -122.798 4.2 3 km ( 2 mi) NNE of The Geysers, CA
ML2.2 2007/04/19 07:19:42 39.478 -123.109 4.0 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/19 06:51:14 32.684 -116.049 9.9 8 km ( 5 mi) SW of Ocotillo, CA
ML1.4 2007/04/19 06:40:00 39.909 -122.727 10.4 29 km ( 18 mi) N of Alder Springs, CA
ML2.0 2007/04/19 06:32:29 33.889 -118.573 12.1 15 km ( 9 mi) SW of Marina del Rey, CA
ML2.9 2007/04/19 06:27:33 39.451 -123.105 6.4 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.4 2007/04/19 06:19:35 39.467 -123.096 5.8 14 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.3 2007/04/19 06:06:28 33.994 -116.803 21.6 10 km ( 6 mi) NNW of Cabazon, 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

ML1.2 2007/04/19 11:47:56 34.025 -117.045 18.6 1 km ( 0 mi) SSE of Yucaipa, CA
ML2.9 2007/04/19 11:33:31 32.684 -116.064 10.8 9 km ( 6 mi) SW of Ocotillo, CA

M4.4 2007/04/19 11:15:46 16.898 -93.741 137.3 CHIAPAS, MEXICO

ML1.2 2007/04/19 10:42:47 32.700 -116.057 10.4 7 km ( 4 mi) SW of Ocotillo, CA
ML1.8 2007/04/19 10:29:36 39.453 -123.108 3.4 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/19 10:27:49 36.624 -121.234 7.8 13 km ( 8 mi) NW of Pinnacles, CA
ML1.1 2007/04/19 10:26:59 32.705 -116.048 10.5 6 km ( 4 mi) SW of Ocotillo, CA

M4.5 2007/04/19 10:15:47 39.755 24.148 10.0 AEGEAN SEA

ML1.9 2007/04/19 10:09:14 32.698 -116.057 9.6 7 km ( 5 mi) SW of Ocotillo, CA

M5.4 2007/04/19 10:02:11 17.399 -100.895 23.5 GUERRERO, MEXICO

ML1.2 2007/04/19 09:58:01 32.703 -116.053 9.8 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/19 09:56:43 32.704 -116.039 8.0 6 km ( 3 mi) SW of Ocotillo, CA
ML1.9 2007/04/19 09:19:59 33.866 -116.835 16.3 8 km ( 5 mi) SW of Cabazon, CA

M5.2 2007/04/19 09:05:09 0.820 125.934 10.0 MOLUCCA SEA

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 2007/04/19 14:43:06 32.696 -116.055 10.2 7 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/19 14:41:07 32.691 -116.040 10.1 7 km ( 4 mi) SW of Ocotillo, CA
ML2.1 2007/04/19 14:33:38 38.819 -122.814 4.7 2 km ( 1 mi) NNW of The Geysers, CA
ML1.9 2007/04/19 14:25:31 38.821 -122.797 3.8 3 km ( 2 mi) NNE of The Geysers, CA
ML1.5 2007/04/19 14:25:20 32.690 -116.044 7.7 7 km ( 4 mi) SW of Ocotillo, CA
ML2.0 2007/04/19 14:04:50 38.815 -122.816 2.9 2 km ( 1 mi) NNW of The Geysers, CA
ML1.0 2007/04/19 14:04:28 33.477 -116.534 8.0 15 km ( 10 mi) SE of Anza, CA
ML2.1 2007/04/19 13:08:41 32.684 -116.049 10.2 8 km ( 5 mi) SW of Ocotillo, CA
ML1.2 2007/04/19 13:07:17 33.048 -116.392 8.5 18 km ( 11 mi) E of Julian, CA
ML1.3 2007/04/19 12:35:29 32.699 -116.041 7.7 6 km ( 4 mi) SW of Ocotillo, CA
ML2.5 2007/04/19 12:30:33 32.701 -116.059 9.2 7 km ( 5 mi) SW of Ocotillo, CA
ML1.7 2007/04/19 12:21:53 38.653 -119.504 8.0 22 km ( 14 mi) SW of Smith, NV
ML2.2 2007/04/19 12:03:50 33.210 -116.279 10.6 10 km ( 6 mi) ESE of Borrego Springs, CA
ML2.8 2007/04/19 12:01:23 32.691 -116.061 10.6 8 km ( 5 mi) SW of Ocotillo, 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 2007/04/19 17:57:28 32.697 -116.041 10.2 6 km ( 4 mi) SW of Ocotillo, CA
ML1.8 2007/04/19 17:43:18 32.701 -116.048 8.8 6 km ( 4 mi) SW of Ocotillo, CA
ML1.1 2007/04/19 17:41:58 32.707 -116.035 8.8 5 km ( 3 mi) SW of Ocotillo, CA
ML1.8 2007/04/19 17:18:01 33.044 -116.397 12.0 18 km ( 11 mi) E of Julian, CA
ML1.6 2007/04/19 17:11:18 32.702 -116.060 8.8 7 km ( 4 mi) SW of Ocotillo, CA

M4.9 2007/04/19 16:32:06 -28.380 -67.615 133.7 LA RIOJA, ARGENTINA

ML1.9 2007/04/19 16:16:22 39.446 -123.105 1.3 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/19 16:11:02 34.376 -116.485 13.1 28 km ( 18 mi) NNW of Yucca Valley, CA
ML2.3 2007/04/19 15:45:25 32.233 -117.523 3.5 48 km ( 30 mi) WSW of Rosarito, Mexico
ML1.6 2007/04/19 15:43:55 39.451 -123.113 1.7 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.2 2007/04/19 15:38:10 37.329 -122.250 7.0 6 km ( 4 mi) SSW of Portola Valley, CA

ML3.0 2007/04/19 15:34:15 19.325 -67.628 4.7 111 km ( 69 mi) NNW of Cabán, PR

ML1.2 2007/04/19 15:01:25 37.500 -118.801 13.4 13 km ( 8 mi) WSW of Toms Place, 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

ML1.8 2007/04/19 20:31:27 33.492 -116.488 11.4 18 km ( 11 mi) ESE of Anza, CA
ML1.1 2007/04/19 20:30:44 33.497 -116.476 12.0 19 km ( 12 mi) ESE of Anza, CA
ML1.2 2007/04/19 20:30:38 33.505 -116.475 13.5 19 km ( 12 mi) ESE of Anza, CA
ML1.6 2007/04/19 20:23:44 39.453 -123.108 1.6 14 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/19 20:10:55 33.464 -116.578 12.4 13 km ( 8 mi) SE of Anza, CA

M5.0 2007/04/19 19:37:46 -2.437 137.895 10.0 PAPUA, INDONESIA

ML1.5 2007/04/19 19:32:26 32.699 -116.047 9.8 7 km ( 4 mi) SW of Ocotillo, CA
ML2.3 2007/04/19 19:27:52 32.646 -116.053 9.8 12 km ( 7 mi) SSW of Ocotillo, CA
ML1.2 2007/04/19 19:25:24 38.827 -122.805 1.6 3 km ( 2 mi) N of The Geysers, CA
ML1.2 2007/04/19 18:53:48 37.009 -116.757 0.0 11 km ( 7 mi) N of Beatty, NV
ML1.2 2007/04/19 18:44:25 32.693 -116.040 8.8 7 km ( 4 mi) SW of Ocotillo, CA
ML1.6 2007/04/19 18:19:50 37.555 -118.496 14.1 16 km ( 10 mi) E of Toms Place, 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

ML2.5 2007/04/19 23:58:00 34.050 -117.125 13.8 2 km ( 1 mi) SSW of Mentone, CA
ML1.2 2007/04/19 23:39:48 32.698 -116.034 6.9 6 km ( 4 mi) SW of Ocotillo, CA
ML1.2 2007/04/19 23:27:07 37.443 -118.842 8.3 19 km ( 12 mi) SW of Toms Place, CA
ML2.4 2007/04/19 23:24:16 32.905 -115.531 19.2 8 km ( 5 mi) NNE of Imperial, CA
ML1.8 2007/04/19 22:52:13 34.188 -117.415 10.4 4 km ( 2 mi) SSW of Devore, CA
ML1.1 2007/04/19 22:07:41 33.450 -116.940 5.5 13 km ( 8 mi) NW of Palomar Observatory, CA
ML1.7 2007/04/19 22:05:47 33.611 -116.734 13.6 9 km ( 5 mi) NW of Anza, CA
ML2.4 2007/04/19 21:29:57 37.606 -119.463 6.7 18 km ( 11 mi) SSE of Yosemite Valley, CA
ML1.0 2007/04/19 21:08:24 33.364 -116.374 14.7 13 km ( 8 mi) N of Borrego Springs, CA
ML1.9 2007/04/19 21:07:29 34.628 -116.290 5.5 16 km ( 10 mi) SW of Ludlow, CA

April 20, 2007

Peak Crustal Resonant Frequency = 0.56 Hz (-66.95 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

ML1.7 2007/04/20 02:48:37 32.698 -116.047 7.8 7 km ( 4 mi) SW of Ocotillo, CA

M5.1 2007/04/20 02:48:05 20.205 122.330 35.0 BATAN ISLANDS REGION, PHILIPPINES

ML1.9 2007/04/20 02:45:53 38.777 -122.739 0.0 4 km ( 3 mi) W of Anderson Springs, CA

M5.9 2007/04/20 02:23:34 25.633 125.044 10.0 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

M6.1 2007/04/20 01:45:57 25.739 125.222 10.0 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

ML1.4 2007/04/20 01:42:59 38.821 -122.827 3.1 3 km ( 2 mi) NW of The Geysers, CA
ML1.5 2007/04/20 01:40:06 39.448 -123.103 1.3 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.7 2007/04/20 01:39:28 34.036 -117.232 16.5 2 km ( 1 mi) SE of Loma Linda, CA
ML1.0 2007/04/20 00:53:29 37.355 -121.724 2.9 9 km ( 6 mi) E of Alum Rock, CA

M5.3 2007/04/20 00:39:20 -7.170 155.153 10.0 SOLOMON ISLANDS
M5.6 2007/04/20 00:31:07 25.740 125.080 57.5 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

M6.0 2007/04/20 00:26:46 25.664 125.103 50.4 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

ML1.0 2007/04/20 00:05:19 33.373 -116.346 5.5 14 km ( 9 mi) N of Borrego Springs, CA
ML1.6 2007/04/20 00:01:12 38.768 -122.712 2.5 2 km ( 1 mi) WSW of Anderson Springs, 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

ML2.6 2007/04/20 05:26:25 38.737 -122.706 0.2 4 km ( 3 mi) SSW of Anderson Springs, CA

M5.3 2007/04/20 05:23:12 25.680 125.274 10.0 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

ML2.3 2007/04/20 04:57:40 36.649 -121.266 5.3 16 km ( 10 mi) SSE of Tres Pinos, CA
ML1.9 2007/04/20 04:53:46 39.477 -123.109 2.5 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.4 2007/04/20 04:21:36 32.693 -116.043 10.6 7 km ( 4 mi) SW of Ocotillo, CA
ML1.7 2007/04/20 04:20:01 33.873 -117.808 10.8 2 km ( 1 mi) SW of Yorba Linda, CA
ML1.9 2007/04/20 03:33:14 32.704 -116.047 8.4 6 km ( 4 mi) SW of Ocotillo, CA

M5.3 2007/04/20 03:28:55 25.676 125.426 10.0 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

ML3.7 2007/04/20 03:25:26 38.648 -119.538 1.8 23 km ( 14 mi) ESE of Markleeville, CA

M5.1 2007/04/20 03:00:58 25.664 125.380 10.0 SOUTHWESTERN RYUKYU ISLANDS, JAPAN

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 2007/04/20 08:58:56 39.440 -123.098 0.5 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.8 2007/04/20 08:14:12 38.795 -122.798 4.2 1 km ( 1 mi) ESE of The Geysers, CA

M4.8 2007/04/20 07:59:45 26.066 125.121 10.0 NORTHEAST OF TAIWAN

ML1.8 2007/04/20 07:50:39 39.436 -123.104 3.7 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML2.3 2007/04/20 07:50:04 33.566 -117.105 20.2 5 km ( 3 mi) E of Murrieta Hot Springs, CA

M4.2 2007/04/20 06:48:13 16.879 145.325 435.4 ANATAHAN REG., NORTHERN MARIANA ISLANDS

ML1.8 2007/04/20 06:37:04 35.756 -121.046 4.3 15 km ( 9 mi) W of Lake Nacimiento, CA
ML1.5 2007/04/20 06:20:46 38.822 -122.791 4.6 3 km ( 2 mi) NNE of The Geysers, CA
ML2.3 2007/04/20 06:18:36 38.823 -122.777 0.0 4 km ( 2 mi) NE of The Geysers, CA
ML2.0 2007/04/20 06:18:33 32.695 -116.061 7.6 8 km ( 5 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

ML1.6 2007/04/20 11:48:27 39.432 -123.111 11.2 13 km ( 8 mi) W of Lake Pillsbury, CA
ML2.9 2007/04/20 11:28:06 34.034 -117.169 13.3 2 km ( 2 mi) S of Redlands, CA
ML1.5 2007/04/20 11:14:21 32.700 -116.047 10.0 6 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/20 11:06:29 32.697 -116.048 10.0 7 km ( 4 mi) SW of Ocotillo, CA
ML1.3 2007/04/20 10:48:17 32.701 -116.043 9.3 6 km ( 4 mi) SW of Ocotillo, CA

ML4.5 2007/04/20 09:49:56 53.722 -164.243 33.9 UNIMAK ISLAND REGION, ALASKA

ML1.3 2007/04/20 09:13:08 33.686 -116.808 16.9 11 km ( 7 mi) SW of Idyllwild, 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

ML3.5 2007/04/20 14:55:24 19.011 -64.662 5.3 48 km ( 30 mi) NW of Settlement, British Virgin Islands

ML1.5 2007/04/20 14:51:27 39.483 -123.079 10.6 13 km ( 8 mi) NW of Lake Pillsbury, CA
ML1.7 2007/04/20 14:34:11 38.817 -122.794 2.2 2 km ( 1 mi) NNE of The Geysers, CA
ML1.7 2007/04/20 14:21:36 36.470 -121.046 5.9 11 km ( 7 mi) SE of Pinnacles, CA
ML1.3 2007/04/20 12:51:56 32.688 -116.044 9.1 7 km ( 4 mi) SW of Ocotillo, CA
ML1.9 2007/04/20 12:47:50 35.787 -117.670 6.8 18 km ( 11 mi) N of Ridgecrest, CA
ML1.8 2007/04/20 12:42:27 37.523 -118.433 9.7 18 km ( 11 mi) N of Bishop, 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

M4.2 2007/04/20 17:39:30 60.393 60.106 10.0 URAL MOUNTAINS REGION, RUSSIA
M4.8 2007/04/20 17:33:01 1.409 127.009 76.6 HALMAHERA, INDONESIA
M4.5 2007/04/20 17:29:10 85.223 11.370 10.0 NORTH OF SVALBARD

ML5.2 2007/04/20 17:20:09 52.546 -176.011 176.8 ANDREANOF ISLANDS, ALEUTIAN IS., ALASKA

M4.2 2007/04/20 16:41:18 2.322 99.156 157.1 NORTHERN SUMATRA, INDONESIA

ML1.4 2007/04/20 15:56:50 35.992 -120.379 29.1 11 km ( 7 mi) NNE of Parkfield, CA

M5.6 2007/04/20 15:14:13 -33.722 -178.901 50.0 SOUTH OF THE KERMADEC ISLANDS

ML2.0 2007/04/20 15:09:11 38.428 -122.215 5.5 13 km ( 8 mi) ENE of Yountville, CA
ML2.4 2007/04/20 15:09:00 35.772 -117.666 11.0 17 km ( 10 mi) N of Ridgecrest, CA

ML4.3 2007/04/20 15:06:46 69.662 -143.672 25.0 NORTHERN ALASKA

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

ML2.1 2007/04/20 20:47:10 36.063 -115.433 4.0 3 km ( 2 mi) WNW of Blue Diamond, NV
ML1.8 2007/04/20 20:31:33 37.873 -122.251 8.6 2 km ( 1 mi) E of Berkeley, CA

M4.2 2007/04/20 20:02:47 19.588 121.409 40.9 BABUYAN ISLANDS REGION, PHILIPPINES

ML2.2 2007/04/20 19:49:47 39.482 -123.107 5.0 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.5 2007/04/20 19:41:01 38.842 -122.769 4.0 4 km ( 3 mi) W of Cobb, CA

M5.9 2007/04/20 19:37:58 27.493 128.491 41.8 RYUKYU ISLANDS, JAPAN

ML1.6 2007/04/20 19:28:25 37.851 -116.767 0.0 25 km ( 15 mi) W of Silverbow, NV
ML2.0 2007/04/20 19:28:16 39.476 -123.108 5.1 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML2.0 2007/04/20 19:12:33 39.478 -123.110 3.9 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.6 2007/04/20 19:11:59 39.447 -123.108 3.9 14 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.9 2007/04/20 18:40:57 35.996 -120.568 4.0 16 km ( 10 mi) NW of Parkfield, CA
ML1.5 2007/04/20 18:29:53 35.998 -120.566 3.0 16 km ( 10 mi) NW of Parkfield, CA
ML1.4 2007/04/20 18:16:26 33.126 -116.087 11.7 5 km ( 3 mi) ESE of Ocotillo Wells, CA

M4.3 2007/04/20 18:14:49 46.869 155.346 10.0 EAST OF THE KURIL ISLANDS

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

ML1.4 2007/04/20 23:45:00 32.696 -116.044 9.1 7 km ( 4 mi) SW of Ocotillo, CA
ML1.7 2007/04/20 23:44:16 32.686 -116.045 9.2 7 km ( 5 mi) SW of Ocotillo, CA

ML3.2 2007/04/20 23:10:54 18.127 -67.075 8.4 5 km ( 3 mi) NNE of Sabana Eneas, PR

ML1.5 2007/04/20 22:49:27 39.456 -123.118 3.6 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.4 2007/04/20 22:17:20 36.530 -114.867 0.0 8 km ( 5 mi) NNW of Dry Lake, NV
ML1.9 2007/04/20 22:11:41 32.700 -116.040 9.0 6 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/20 21:44:04 35.659 -120.763 5.2 8 km ( 5 mi) WNW of Paso Robles, CA
ML1.5 2007/04/20 21:42:26 36.742 -121.338 8.2 6 km ( 3 mi) SSW of Tres Pinos, CA
ML2.0 2007/04/20 21:31:14 33.795 -118.579 6.0 14 km ( 9 mi) W of Palos Verdes Point, CA
ML2.7 2007/04/20 21:20:37 37.473 -119.882 23.5 1 km ( 1 mi) N of Bootjack, CA
ML1.7 2007/04/20 21:14:05 34.888 -119.037 4.6 11 km ( 7 mi) NW of Frazier Park, CA

April 21, 2007

24 Hour Peak Crustal Resonant Frequency = 0.54 Hz (-66.68 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

ML1.6 2007/04/21 02:59:10 32.681 -116.028 14.3 7 km ( 4 mi) SSW of Ocotillo, CA
ML1.0 2007/04/21 02:54:29 37.173 -121.973 3.8 2 km ( 1 mi) NNE of Lexington Hills, CA
ML1.3 2007/04/21 01:57:32 36.124 -121.608 5.1 12 km ( 8 mi) NNW of Lopez Point, CA
ML1.3 2007/04/21 01:37:35 32.683 -116.062 5.1 9 km ( 5 mi) SW of Ocotillo, CA
ML1.2 2007/04/21 01:18:53 36.636 -121.254 5.3 15 km ( 9 mi) NW of Pinnacles, CA

M4.8 2007/04/21 01:04:41 -17.734 -171.743 35.0 TONGA REGION
M5.4 2007/04/21 00:32:29 21.177 122.132 35.0 TAIWAN REGION

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

ML1.2 2007/04/21 04:49:44 37.269 -115.541 16.0 35 km ( 22 mi) WSW of Alamo, NV
ML1.4 2007/04/21 04:44:25 35.577 -120.843 7.6 12 km ( 8 mi) WNW of Templeton, CA
ML1.9 2007/04/21 04:11:08 34.032 -116.940 17.5 10 km ( 6 mi) E of Yucaipa, CA
ML1.4 2007/04/21 03:16:28 36.532 -121.086 7.0 5 km ( 3 mi) E of Pinnacles, CA
ML1.6 2007/04/21 03:06:47 39.444 -123.106 1.7 13 km ( 8 mi) WNW of Lake Pillsbury, 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 2007/04/21 07:53:05 34.666 -117.565 15.2 16 km ( 10 mi) NW of Adelanto, CA
ML1.2 2007/04/21 07:15:18 38.815 -122.793 4.5 2 km ( 1 mi) NNE of The Geysers, CA
ML2.3 2007/04/21 07:12:52 38.813 -122.795 3.6 2 km ( 1 mi) NNE of The Geysers, CA

M6.1 2007/04/21 07:12:47 -3.554 151.322 401.7 NEW IRELAND REGION, PAPUA NEW GUINEA

ML1.5 2007/04/21 06:25:55 33.964 -116.857 9.5 5 km ( 3 mi) NE of Banning, 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 2007/04/21 11:20:38 32.684 -116.055 3.9 8 km ( 5 mi) SW of Ocotillo, CA
ML1.8 2007/04/21 10:37:27 32.692 -116.039 8.5 7 km ( 4 mi) SW of Ocotillo, CA
ML1.5 2007/04/21 10:34:01 33.998 -116.767 17.6 10 km ( 6 mi) N of Cabazon, CA

M5.1 2007/04/21 10:12:43 -3.076 100.911 30.0 KEPULAUAN MENTAWAI REGION, INDONESIA

ML3.2 2007/04/21 10:04:19 32.676 -116.062 7.4 9 km ( 6 mi) SW of Ocotillo, CA

ML1.4 2007/04/21 10:02:55 38.816 -122.793 3.1 2 km ( 1 mi) NNE of The Geysers, CA

M4.6 2007/04/21 09:47:58 10.710 -62.608 110.5 SUCRE, VENEZUELA

ML1.9 2007/04/21 09:14:09 38.813 -122.792 4.8 2 km ( 1 mi) NE of The Geysers, CA
ML2.1 2007/04/21 09:07:12 32.674 -116.061 8.9 9 km ( 6 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

ML1.1 2007/04/21 14:59:18 37.527 -118.822 6.0 13 km ( 8 mi) WSW of Toms Place, CA
ML1.2 2007/04/21 14:58:48 37.528 -118.819 5.7 13 km ( 8 mi) WSW of Toms Place, CA
ML1.5 2007/04/21 14:55:20 32.682 -116.046 9.8 8 km ( 5 mi) SW of Ocotillo, CA
ML1.9 2007/04/21 14:11:31 39.479 -123.108 4.7 15 km ( 9 mi) WNW of Lake Pillsbury, CA
ML1.4 2007/04/21 13:02:29 38.820 -122.795 3.5 3 km ( 2 mi) NNE of The Geysers, CA
ML1.3 2007/04/21 12:53:22 33.824 -116.999 12.7 5 km ( 3 mi) NW of San Jacinto, 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

M6.2 2007/04/21 17:53:46 -45.285 -72.606 27.0 AISEN, CHILE

ML1.3 2007/04/21 17:50:24 34.063 -116.831 8.1 4 km ( 3 mi) S of Mt. San Gorgonio, CA

M6.0 2007/04/21 17:20:32 -13.912 166.881 40.7 VANUATU

M4.7 2007/04/21 17:08:27 21.601 120.427 10.0 TAIWAN REGION

ML2.2 2007/04/21 17:02:27 38.794 -122.755 3.0 4 km ( 3 mi) E of The Geysers, CA
ML1.4 2007/04/21 16:57:26 33.743 -116.046 1.7 14 km ( 9 mi) ENE of Coachella, CA

M4.7 2007/04/21 16:11:39 1.498 -29.615 10.0 CENTRAL MID-ATLANTIC RIDGE

ML1.8 2007/04/21 15:44:02 38.824 -122.785 2.0 3 km ( 2 mi) NNE of The Geysers, CA
ML1.8 2007/04/21 15:29:53 39.486 -123.079 9.4 13 km ( 8 mi) NW of Lake Pillsbury, 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

ML3.2 2007/04/21 20:57:30 41.586 -108.699 2.5 13 km ( 8 mi) SE of Point of Rocks, WY

ML1.6 2007/04/21 20:07:40 35.065 -118.326 7.2 13 km ( 8 mi) ESE of Tehachapi, CA
ML1.4 2007/04/21 19:52:04 32.690 -116.052 11.3 8 km ( 5 mi) SW of Ocotillo, CA
ML1.5 2007/04/21 19:29:37 33.113 -115.621 11.8 7 km ( 4 mi) SSE of Obsidian Butte, CA
ML1.5 2007/04/21 18:47:25 38.791 -122.744 1.9 5 km ( 3 mi) WNW of Anderson Springs, CA
ML1.3 2007/04/21 18:43:20 36.211 -120.387 33.7 8 km ( 5 mi) NNW of Coalinga, 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

ML1.2 2007/04/21 23:58:14 37.974 -116.995 16.0 23 km ( 14 mi) ESE of Tonopah, NV

M4.8 2007/04/21 23:33:32 36.496 70.948 213.5 HINDU KUSH REGION, AFGHANISTAN

ML2.5 2007/04/21 23:18:15 39.444 -123.106 0.3 13 km ( 8 mi) WNW of Lake Pillsbury, CA
ML1.3 2007/04/21 22:40:33 36.462 -121.057 2.0 11 km ( 7 mi) SE of Pinnacles, CA

ML4.7 2007/04/21 21:24:45 52.664 -170.323 67.0 FOX ISLANDS, ALEUTIAN ISLANDS, ALASKA

Frank Condon

Independent Earthquake Precursor Research Consultant

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