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Earthquake Volume 4, Issue No. 305 |
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Earthquake Volume 4, Issue No. 305 |
GeoSeismic Labs Reports: Early EditionAll information reported here is based upon data collection and analysis using procedures that are considered "experimental" and might be of a shocking nature to some individuals. Read and use at your own risk! SAN JACINTO FAULT ALERT: Wrightwood to Anza, CA |
Mount St. Helens Eruption Update:U.S. Geological Survey, Vancouver, WashingtonUniversity of Washington, Pacific Northwest Seismograph Network, Seattle, Washington Mount St. Helens Volcano, October 31, 2004 11:00 am PDT (17:00 UTC) Current status is Volcano Advisory (Alert Level 2); aviation color code ORANGE
Growth of the new lava dome inside the crater of Mount St. Helens
continues. As long as this eruption is in progress, episodic
changes in the level of activity can occur over days, weeks,
or even months. Increase in the intensity of eruption could
occur suddenly or with very little warning and may include
explosive events that produce hazardous conditions within
several miles of the volcano.
Small lahars (volcanic debris flows) could suddenly descend
the Toutle River valley if triggered by heavy rain
or by interaction of hot rocks with snow or glacier ice. These
lahars pose a negligible hazard below the Sediment Retention
Structure (SRS), but could pose a hazard to people
along the river channel upstream of the SRS. At this time of
year, it is not unusual for rivers draining the volcano to
contain high concentrations of sediment that turn the water
murky.
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Caution: You may need to refresh the displayed page in order to view the latest live Volcano-Webcam. Recent Infrasonic Activity Associated with Deep Crustal Activity 
Eastern California Shear Zone
Living With a Restless Caldera:Long Valley, California 
San Jacinto Fault Zone Advisory
MT ULF UPDATE: October 6, 2004 I'm stilll detecting periods with unstable geomagnetic oscillation that appear to be associated with micro quakes epicentered from near Redlands to Anza, CA. along the San Jacinto fault Zone(Anza Seismic Gap). Also, noticed there was a concentration of them ESE of Anza, CA near Collins Valley. Another high stress point is between Hemet and Banning, CA. Significant amounts of geomagnetic oscillation often indicate that rupture is extremely close in time. MT ULF UPDATE: October 7, 2004 The Infrasonic (AE) Activity has increased over the past 24 hours with definitely strong spectral content from 1.2 to 1.9 Hz with a peak reading at 1.21 Hz (-69.01 dBv)and lesser peaks at 1.4 Hz (-72.36 dBv), 1.66 Hz (-72.98 dBv) and 1.83 Hz (-73.12 dBv). It's inferred that the resonant frequency at 1.21 Hz is the latitude of Southern Sierras/Coso/Olancha Peak, Parkfield, CA). Also, the 1.4 Hz is close to being for the latitude of the Long Valley/Mammoth lakes/Round Valley, CA region. The peak at 1.66 Hz is infered to be the latitude of Mt. Saint Helens, WA and 1.83 Hz the latitude of the northern Cascades Mt. Baker region. MT ULF UPDATE: October 8, 2004 A few earthquakes to note since the last update. There was one near Coso (M3.2), and one near Parkfield, CA (M3.0) Also, the swarm near Long Valley/Mammoth Lakes was active with a M4.5 earthquake epicentered in the Adobe Hills volcanic field. Both regions were noted to have higher than normal infrasonic (peaks). Also, the seismicity of Mt. Saint Helens also increased today. The level of geomagnetic oscillation was high, and I continue to monitor the levels of geomagnetic disturbance. Also, there was one MT pulse which was associated with the Qualeys Camp region that occurred late in the afternoon. There is an inferred increase in crustal stress out of the ECSZ/Mojave Desert, which apparently is nucleating towards the Owens Valley/Southern Sierras and Coso Range. This in turn partially gets transfered towards the Central California coast and the San Andreas fault via the Garlock/Big Pine fault zone. The increase in stress along the San Andreas and Garlock fault then nucleates southeast into the San Jacinto Fault near Wrightwood, CA. So, the center of highest stress still appears to be the ECSZ/Mojave Desert block, and that will cause many secondary faults surrounding the region to react in preparation for the next major earthquake in Southern California. However, the intensity of geomagnetic oscillation is telling us that it won't be too much longer. MT ULF UPDATE: October 9, 2004 The most notable earthquake of the past 24 hours was epicentered in between both the Western Garlock fault zone(69a) and Cholame(1g) to Mojave segment(1h) along the San Andreas fault zone M4.7 2004/10/09 03:45:48 UT 37.980 -118.659 8.2 38 km ( 24 mi) SSW of Qualeys Camp, NV zone in the Mojave Desert block, and associated with the high levels of geomagnetic oscillation (disturbance) now being detected. Also, inferred are micro-fractures occuring along the Pacific and North American Plate boundary, which are visible as discrete jumps in the local (Cajon Pass) geomagnetic field strength. MT ULF UPDATE: October 10, 2004 Another earthquake was epicentered north of the Garlock fault zone and epicentered along the Sierra Nevada Frontal fault zone NW of Coso Junction, CA. M3.5 2004/10/10 14:03:22 UT 37.963N 118.661W d:5.3 km ( 25 mi) SSW of Qualeys Camp, NV out of the ECSZ/Mojave Desert block and across the Garlock fault zone into the Sierra Nevada block near Olancha Peak. Remarkably, there was significantly less geomagnetic oscillation detected over the past 24 hours. MT ULF UPDATE: October 11, 2004 Periods of observed unclamping were quite evident during the past 24 hours. Also, a micro quake epicentered in the Santa Barbara Channel was related to a geomagnetic shift. No further periods of strong geomagnetic oscillation were detected, and a micro quake epicentered near Lytle Creek (SJFZ), that had a ULF burst associated with it. Infrasonic activity appeared to become quite strong early Monday evening with a peak at 1.33 Hz (Owens Valley region). MT ULF UPDATE: October 12, 2004 There were some periods of geomagnetic oscillation detected during the past 24 hours. M3.0 2004/10/12 19:51:21 UT 37.977N 118.662W d:9.0 km ( 24 mi) SSW of Qualeys Camp, NV plate boundary at the Cajon Pass region. Some maintenance is scheduled during the next 24 hours, and the next report could be delayed up to several hours. MT ULF UPDATE: October 13, 2004 I'm becoming quite concerned by the number of micro quakes epicentered along the San Jacinto fault zone and adjacent secondary faults, which appear to be associated with periods of geomagnetic oscillation and shifting. The shifting appears to indicate a regime that is under high crustal stress. So, those of you within local distance of the San Jacinto fault zone at the Cajon Pass should stay on alert and keep an eye on those pets, too. M3.3 2004/10/13 08:34:16 UT 38.063N 118.695W d:4.0 km ( 19 mi) SSW of Qualeys Camp, NV it nears in time. MT ULF UPDATE: October 14, 2004 The latest analysis of Geomagnetic shifting indicates increased association with faults local to the Inland Empire. Namely the Rialto-Colton fault appears to have had at least two periods of shifting related to micro quakes during the past 24 hours. Grand Terrace may now be close to the focus of the shifting. Also, local geomagnetic field oscillation was quite active. So, the San Jacinto fault needs to be watched carefully. M4.1 2004/10/14 01:04:21 UT 27.689N 112.015W d:10.0 km ( 30 mi) NNE of Santa Rosalía, Mexico MT ULF UPDATE: October 15, 2004 There were several periods of observed geomagnetic oscillation that appear to be related to the Plate boundary in Southern California. Another interesting detection was shifting associated with one of the faults south of Joshua Tree, which failed during the Landers earthquake in 1992. Also one period of unclamping was observed. One comment about the small earthquake in Santa Paula, which appears to be associated with the San Cayetano fault. We can expect to see more random seismic activity along the secondary faults as the plate boundary moves closer to failure. M3.4 2004/10/16 05:05:35 UT 34.454N 119.116W d:26.4 km ( 7 mi) NNW of Santa Paula, CA MT ULF UPDATE: October 16, 2004 There were several hours of time where strong unclamping was observed. Also, another geomagnetic field shift associated with a micro quake epicentered near Cherry Valley, CA. Some geomagnetic oscillation was also observed coming from east of the San Andreas fault and Indio, CA. The strongest infrasonic harmonic was at 1.09 Hz, which is just above the inferred resonant frequency (1 Hz) for the Plate boundary in Southern California. M3.1 2004/10/17 05:57:02 UT 35.898N 120.442W d:6.4 km ( 1 mi) WSW of Parkfield, CA MT ULF UPDATE: October 17, 2004 Once again, there were several hours where strong unclamping was observed. Infrasonic Harmonic activity was moderate. No geomagnetic oscillation was detected. There were a couple micro quakes which was epicentered SE of the aftershock zone for the Parkfield M6.0 in the Cholame Valley that had observed ULF activity. It's an area where according to some experts the precursor for the next great earthquake(1857) is inferred to be located. M3.2 2004/10/17 11:35:11 UT 35.579N 120.882W d:5.9 km ( 10 mi) N of Cayucos, CA MT ULF UPDATE: October 18, 2004 Continued strong unclamping was observed during the past 24 hours. Also, infrasonic harmonic activity for most of the last 24 hours had a significant number of upper-level harmonics visible with a strong fundamental harmonic (AE) at 0.9 Hz (-68.7 dBv), which is just below the inferred resonant harmonic frequency for deep crustal energy along the Pacific and North American plate boundary in Southern California at 1 Hz. However, Acoustic Emissions overall were strong across a bandwidth from 0.9 to approximately 1.4 Hz. What appears to be a small earthquake was epicentered along the Anza Seismic Gap, and timed to be during a period of observed strong deep crustal harmonic energy (see spectrogram above, or click here). M3.2 2004/10/19 02:12:09 UT 33.505N 116.519W d:13.4 km ( 9 mi) ESE of Anza, CA MT ULF UPDATE: October 19, 2004 Note: The San Jacinto Fault Alert is still in effect. There was another day with observed severe unclamping along the plate boundary. Extremely strong infrasonic harmonic activity was detected for most of the past 24 hours. Overall it was a broad band of fundamental deep resonant crustal energy that was very active. (see spectrogram above, or click here). Also, the mean average ULF reading was sharply more positive. MT ULF UPDATE: October 20, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was another day with observed severe unclamping along the plate boundary along with strong deep crustal infrasonic harmonic activity from 0.56 Hz (-65.8 dBv) Gulf of California and north for most of the past 24 hours. M4.1 2004/10/20 11:35:15 UT 38.039N 118.608W d:4.8 km ( 19 mi) SSW of Qualeys Camp, NV ULF activity was associated with the San Jacinto and Banning faults. (see spectrogram above, or click here). Also, the mean average ULF reading was sharply more positive. MT ULF UPDATE: October 21, 2004 Note: The San Jacinto Fault Alert continues to be in effect. Today, there were observations of several short periods with geomagnetic oscillation. The ULF mean average was slightly more positive during the past 24 hours, and reached a level that was last observed in early June 2004. Unclamping was still quite active during the early part of the day. There was also another long period with strong infrasonic resonant harmonic energy with a peak at 0.56 Hz (-68.28 dBv) for the Gulf of California and north along the plate boundary. (see spectrogram above, or click here). M3.1 2004/10/21 22:14:34 UT 38.770N 122.731W d:0.7 km ( 2 mi) W of Anderson Springs, CA MT ULF UPDATE: October 22, 2004 Note: The San Jacinto Fault Alert continues to be in effect. Some unclamping was observed during the day. No oscillations were detected. There was another long period with strong infrasonic resonant harmonic energy with a peak at 1.06 Hz (-68.72 dBv) for the Gulf of California and north along the plate boundary. (see spectrogram above, or click here). MT ULF UPDATE: October 23, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was another long period with strong infrasonic resonant harmonic energy with a peak at 0.66 Hz (-67.11 dBv) for the Gulf of California and north along the Pacific and North American plate boundary. (see spectrogram above, or click here). M3.1 2004/10/23 14:16:34 UT 36.660N 121.275W d:3.7km ( 9 mi) SSE of Tres Pinos, CA MT ULF UPDATE: October 24, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was a significantly strong MT pulse which was detected at approximately 12:43 UTC, or about 30 minutes prior to a small earthquake associated with the Adobe Hills CA/NV border region near the Mono Lake/Long Valley caldera.There was another long period with strong infrasonic resonant harmonic energy with a peak at 1.03 Hz (-67.84 dBv) for the the Pacific and North American plate boundary. Also, a Geomagnetic shift was detected which was associated with the Adobe Hills swarm. (see spectrogram above, or click here). M3.3 2004/10/24 13:20:33 UT 38.025N 118.645W d:7.4 km ( 21 mi) SSW of Qualeys Camp, NV MT ULF UPDATE: October 25, 2004 Note: The San Jacinto Fault Alert continues to be in effect. Late today, there was a long period with strong infrasonic resonant harmonic energy with a sharp peak at 1.48 Hz (-71.20 dBv) for Northern California and the PNW. (see spectrogram above, or click here). M3.9 2004/10/25 19:55:37 UT 36.967N 121.600W d:7.9 km ( 3 mi) SSW of Gilroy, CA MT ULF UPDATE: October 26, 2004 Note: The San Jacinto Fault Alert continues to be in effect. Late today, there was a long period with strong infrasonic resonant harmonic energy with a sharp peak at 0.69 Hz (-66.29 dBv) for Baja California. Also, there was a geomagnetic shift associated with the San Jacinto fault near Idyllwild, CA (see spectrogram above, or click here). MT ULF UPDATE: October 27, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was a long period with strong infrasonic resonant harmonic energy with a sharp peak at 0.68 Hz (-67.11 dBv) for Baja California and north along the plate boundary. Also, ULF activity was quite active with a mean average reading not seen since last April. Todays M3.8 epicentered near Big Bear Lake is indicative of a high crustal stress regime that is close to failure. Hence the strong infrasonics will continue without abatement. (see spectrogram above, or click here). M3.8 2004/10/27 21:41:17 UT 34.343N 116.918W d:5.0 km (7 mi) N of town of Big Bear Lake, CA MT ULF UPDATE: October 28, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was a long period with strong infrasonic resonant harmonic energy with a sharp peak at 0.58 Hz (-65.71 dBv) for Baja California and north along the plate boundary. Also, ULF activity was quite active with a mean average reading not seen since last mid-April. (see spectrogram above, or click here). M3.4 2004/10/29 03:32:43 UT 35.785N 120.330W d:9.5 km ( 9 mi) NNE of Shandon, CA MT ULF UPDATE: October 29, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was a long period with strong deep crustal infrasonic resonant harmonic energy with a peak at 0.62 Hz (-66.62 dBv) for Baja California and north along the plate boundary. Also, local geomagnetic field oscillation was quite active and associated with a micro quake epicentered near Yucaipa and the Banning Fault branch of the San Andreas Fault Zone. (see spectrogram above, or click here). M3.8 2004/10/29 18:02:55 UT 38.819N 122.793W d:4.2 km ( 2 mi) NNE of The Geysers, CA MT ULF UPDATE: October 30, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was a long period with strong deep crustal infrasonic resonant harmonic energy (and several upper level spectral lines between 4 and 6 Hz) with a peak at 1.23 Hz (-70.39 dBv) for Central California and further north along the plate boundary. Also, geomagnetic field oscillation was quite active and associated with a micro quake epicentered near Parkfield and the Cholame segment of the Central San Andreas Fault Zone. (see spectrogram above, or click here). M3.4 2004/10/30 16:55:16 UT 37.070N 122.269W d:7.9 km ( 9 mi) WSW of Boulder Creek, CA MT ULF UPDATE: October 31, 2004 Note: The San Jacinto Fault Alert continues to be in effect. There was a long period with strong deep crustal infrasonic resonant harmonic energy with a peak at 0.98 Hz (-68.54 dBv) for Southern California and further north along the plate boundary. Also, there was a piezomagnetic burst associated with a micro quake epicentered near Indio along with a subsequent high frequency ULF signal burst associated with a micro quake epicentered near the Mission Creek branch of the Southern San Andreas Fault Zone. (see spectrogram above, or click here).
MT ULF Charts and Experimental Forecast
The most recent MT peak reading was at 8.6 units of regional lithospheric stress. 
Frank Condon, October 31, 2004 This information is provided as a public service by GeoSeismic Labs of California, a State Registered "Not for Profit" Corporation Since 2001. REMEMBER GEOSEISMIC LABS IS FUNDED BY DONATIONS FROM USERS... PLEASE HELP IF YOU CAN |
