Boom-Boom (aka Maggie) didn't see the new password info so sent me this to post. Many, many thanks, Boom-Boom, this is very interesting stuff.

Date: July 19, 2001 at 21:12:06 From: Frank Condon, Subject: M3.8 Blue Cut (Cajon Pass, CA)

URL: GeoSeismic Labs

Hello all:

A very important seismic event just occurred right here a few hours ago. This event I speak of is a foreshock to a major seismic event near San Bernardino and Riverside, CA. This lab has harped upon this regions potential for major seismic risk for many months and was based upon the magnetic ULF measurements taken from 12 miles Northeast of todays M3.8 in the San Bernardino Mountains at Blue Cut. We are in a very dangerous period and accordingly the Critical Level was raised to a Phase 5 after the onset of the major swarm near Coso Junction which in itself appears to be an anomalous and atypical ULF event. The Locked San Andreas at the Big Bend is in the process of creating a psuedo-subduction zone towards the Barstow region. The visoelastic fluids at depth are very disorganized and are now injecting fluids into the shear zone along the San Andreas fault in the Cajon Pass. THe Mojave Block Warning now goes to a Blanket Seismic Warning until further Notice.

Another quake was just detected from here in the lab!

Frank Condon GeoSeismic Labs

-- Anonymous, July 20, 2001

Answers

GeoSeismic Labs

Pertinent Map Link from Boom-Boom

Earthquake Reports and Charts Worlwide

Near Real-Time Earthquake List

-- Anonymous, July 20, 2001

Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
U.S. Geological Survey, Menlo Park, California
U.C. Berkeley Seismological Laboratory, Berkeley, California

Version #2: This report supersedes any earlier reports of this event. This is a computer-generated message. This event has not yet been reviewed by a seismologist.

A light earthquake occurred at 5:53:07 AM (PDT) on Friday, July 20, 2001.

The magnitude 4.6 event occurred 9 km (6 miles) SE of Coso Junction, CA.

The hypocentral depth is 8 km ( 5 miles).

---------------------------------------------------------------------- ----------

Magnitude 4.6 - local magnitude (Ml)
Time Friday, July 20, 2001 at 5:53:07 AM (PDT)
Friday, July 20, 2001 at 12:53:07 (UTC)
Distance from Coso Junction, CA - 9 km (6 miles) SE (129 degrees)
Olancha, CA - 34 km (21 miles) SSE (159 degrees)
Ridgecrest, CA - 45 km (28 miles) NNW (336 degrees)
Trona, CA - 52 km (32 miles) WNW (299 degrees)
Coordinates 35 deg. 59.6 min. N (35.993N), 117 deg. 52.1 min. W (117.869W)
Depth 8.4 km (5.2 miles)
Location Quality Good
Location Quality Parameters Nst=121, Nph=121, Dmin=17 km, Rmss=0.1 sec, Erho=0.5 km, Erzz=1 km, Gp=169.2 degrees
Event ID# nc51110333

-- Anonymous, July 20, 2001

Doesn't this boil down to 'California is due for a big one?'

-- Anonymous, July 20, 2001

Link

Earthquake Swarm at Coso Junction, Eastern California, July 2001

Posted 18 July, 2001 Egill Hauksson, Kate Hutton, and David Oppenheimer

The recent earthquake swarm near Coso Junction began last week and has so far culminated with the M4.9 event, 17 July 2001. Focal mechanisms of most of these earthquakes show right-lateral motion, striking N5 to N20W with a small normal component. This swarm is located along the southern edge of a similar swarm that occurred in first half of 1992 and lasted off and on for several months. These events are not volcanic in nature, because they have normal frequency content as expected for crustal earthquakes.

Earthquake swarms are common in the Coso Range and the area to the south, extending into Indian Wells Valley, because of the extensional tectonics and presence of a magma chamber beneath the Coso Geothermal field. The extension in the Coso Range and to the south is driven by a releasing step-over between the right-lateral Airport Lake and Owens Valley faults along the east side of the Sierra Nevada. The footwall of this system, the Coso Range, is attached to the Sierra Nevada, and is effectively being pulled to the northwest from beneath Wildhorse Mesa, which is moving as part of the Walker Lane belt. The brittle upper crustal extension may be accommodated at depth by ductile stretching and emplacement of igneous bodies, the presence of which have been inferred in the middle to upper crust from analysis of seismic waves. Late Cenozoic intrusions are interpreted to be the source of heat for the Coso geothermal field.

North of the Coso Range, the major active fault along the eastern margin of the Sierra Nevada is the Owens Valley fault that was the source of the M7.6 1872 Owens Valley earthquake. Surface rupture associated with the 1872 earthquake extended as far south as the western margin of Owens Lake, within 10 km of the Coso Range. Coseismic surface displacement during the 1872 event was predominantly dextral. Currently, the Owens Valley fault slips about 6 mm/yr, which is comparable to the 5-mm/yr rate estimated for the Airport Lake fault south of the Coso Range. These relations thus suggest that earthquake swarms on Quaternary faults in the Coso Range transfer dextral slip along the eastern margin of the Sierra Nevada northward from Indian Wells Valley to the southern Owens Valley. Earthquake swarm activity in this region is quite common. The histogram below shows that magnitude 3 and greater earthquakes occur almost every year, and that notable swarms can persist for months. Many swarms contain an earthquake whose magnitude exceeds 4, but occasionally quakes as large at 5.8 have occurred.

-- Anonymous, July 21, 2001

Hi Barefoot, talk about magma flow might be going on under Coso and that might be the reason for some or most of the earthquakes there or a chance of a larger quake...just my 2 cents worth. One post I read today said the magma under Coso may be on it's way to the Mammoth area.

There was some minor quakes around Fillmore today, which caught my attention because that is my old stomping grounds (played golf there). It' not far from Northridge, CA.

I can't say if a biggy is coming soon or not. Like anything, where ever a person lives....being prepared is a smart thing to do.

Update time = Sun Jul 22 8:00:03 PDT 2001 Here are the earthquakes appearing on this map, most recent at top ...

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

1.6 2001/07/22 05:21:03 34.375N 118.906W 14.3 3 km ( 2 mi) SSE of Fillmore, CA 1.6 2001/07/22 05:21:03 34.376N 118.907W 15.0 3 km ( 2 mi) SSE of Fillmore, CA 0.8 2001/07/22 04:45:44 34.458N 118.001W 6.8 17 km (10 mi) SE of Palmdale, CA 0.8 2001/07/22 04:45:44 34.459N 118.001W 7.3 17 km (10 mi) SE of Palmdale, CA 1.8 2001/07/22 01:26:36 34.358N 118.873W 21.0 6 km ( 4 mi) SE of Fillmore, CA 1.8 2001/07/22 01:26:36 34.361N 118.874W 21.1 6 km ( 4 mi) SE of Fillmore, CA 1.7 2001/07/21 23:26:55 34.381N 118.907W 10.7 2 km ( 1 mi) SSE of Fillmore, CA 1.7 2001/07/21 23:26:55 34.373N 118.898W 13.8 3 km ( 2 mi) SE of Fillmore, CA 1.7 2001/07/21 19:28:08 34.361N 118.853W 19.6 7 km ( 4 mi) SE of Fillmore, CA 1.7 2001/07/21 13:47:36 34.362N 118.872W 17.9 6 km ( 4 mi) SE of Fillmore, CA 2.1 2001/07/18 06:37:42 34.878N 118.936W 3.0 7 km ( 4 mi) N of Frazier Park, CA 1.5 2001/07/16 04:44:14 34.388N 118.694W 15.6 12 km ( 7 mi) W of Valencia, CA

-- Anonymous, July 22, 2001