Well this Saturday morning has been busy, seismically speaking. As of yet there have already been 4 earthquakes greater than M3.0 and it’s not even noon! It all started this morning at 3:34 am when a preliminary M3.8 earthquake awoke the people of the western border region of Inyo and San Bernardino Counties. The hypocenter for the quake was located 13 miles north-northeast of Trona and aftershocks are occurring in this general area. The largest two, so far, have been a (prelminary) M3.6 at 11:11am and a M3.2 at 11:12 am. A special Thank You goes out to the two loyal “feelers” – one in Inyokern and one in Ridgecrest – who visited the “Did You Feel It?” webpage (http://pasadena.wr.usgs.gov/shake/ca/) and informed us of the intensities of the quakes.
Moving south, a M3.5 earthquake occurred at 9:05 am which was located 31 miles south-east of Calexico. As of yet, there is no word that this earthquake was felt.
September 29, 2002
September 28, 2002
Commentary
Commentary
We have had some seismic action in the Panamint Valley area, east of Owens Valley, overnight. The largest events were: a M3.8 at 3:34 am, a M3.6 at 11:11 am & a M3.2 at 11:12 am. The epicenters are all located 13 miles north-northeast of Trona. These quakes are definitely large enough to have been felt, but the area is very sparsely populated.
Also, at 9:05 am, there was a M3.5 in northern Baja, 31 miles southeast of Calexico. This quake might possibly have been felt in the Imperical Valley and, of course, in the epicentral area in Mexico.
September 26, 2002
Commentary
Southern California Earthquakes in the Past Week
Nick Scheckel ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
September 26, 2002
Nick Scheckel ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
September 26, 2002
The time period covered is 5 pm on Thursday, September 19 (PDT)
through 5 pm on Thursday, September 26 (PDT). During this period
we dectected and analysed 201 earthquakes. Click
here to see a map.
The table below lists the quakes during the past week
that were M2.0 or larger in the central part of the coverage area.
Times are local times; if you want Greenwich Mean Time, add 7 hrs
to the Pacific Daylight Time or 8 hrs to the Pacific Standard Time
listed.
Mag. PST Date PST Time Lat. Long. Depth Descriptive location
-------------------------------------------------------------------------------------------
9826341 2.1 2002/09/20 01:28:09 33 9.4 N 115 37.2 W 5.9 2 km ( 1 mi) SE of Obsidian Butte, CA
9826377 2.7 2002/09/20 04:38:36 36 3.0 N 117 52.8 W 2.5 6 km ( 4 mi) E of Coso Junction, CA
9826413 2.2 2002/09/20 08:12:13 34 20.0 N 116 38.3 W 0.8 21 km (13 mi) ENE of Big Bear City, CA
9826537 2.1 2002/09/20 12:09:33 34 20.1 N 116 38.1 W 2.7 21 km (13 mi) ENE of Big Bear City, CA
9826789 4.3 2002/09/21 14:26:16 33 13.5 N 116 6.8 W 14.6 9 km ( 6 mi) N of Ocotillo Wells, CA
Widely felt in the Borrego Badlands. Felt from the U.S./Mexico border to Corona & Twentynine Palms.
9826805 2.1 2002/09/21 15:01:29 33 14.4 N 116 6.6 W 13.2 11 km ( 7 mi) N of Ocotillo Wells, CA
9826849 2.5 2002/09/21 17:58:36 33 14.2 N 116 6.7 W 13.4 11 km ( 7 mi) N of Ocotillo Wells, CA
9510934 2.1 2002/09/22 13:39:36 34 42.1 N 120 27.0 W 3.3 7 km ( 4 mi) N of Lompoc, CA
9827101 2.2 2002/09/23 00:27:33 34 0.2 N 116 46.0 W 20.6 9 km ( 6 mi) N of Cabazon, CA
9827109 3.6 2002/09/23 01:13:16 32 10.9 N 115 23.0 W 7.0 55 km (34 mi) S of Calexico, CA
Felt in the Imperial Valley area
9827157 2.6 2002/09/23 03:08:44 32 16.0 N 115 23.5 W 7.1 46 km (28 mi) SSE of Calexico, CA
9827169 2.7 2002/09/23 05:07:33 32 15.6 N 115 22.7 W 7.0 47 km (29 mi) SSE of Calexico, CA
9827229 3.1 2002/09/23 08:41:26 32 12.4 N 115 22.6 W 7.0 53 km (33 mi) SSE of Calexico, CA
9827329 2.5 2002/09/23 16:25:58 32 16.3 N 115 23.4 W 7.0 45 km (28 mi) SSE of Calexico, CA
9827333 2.5 2002/09/23 16:33:29 33 15.4 N 116 7.8 W 7.8 13 km ( 8 mi) N of Ocotillo Wells, CA
9827357 3.0 2002/09/23 18:20:53 32 14.3 N 115 23.6 W 7.0 49 km (30 mi) SSE of Calexico, CA
9827361 2.3 2002/09/23 18:22:27 32 31.7 N 115 52.3 W 7.0 26 km (16 mi) SSE of Ocotillo, CA
9827473 2.9 2002/09/24 03:48:01 32 16.3 N 115 23.7 W 7.0 45 km (28 mi) SSE of Calexico, CA
9827489 2.6 2002/09/24 05:01:03 32 15.1 N 115 23.4 W 7.0 47 km (29 mi) SSE of Calexico, CA
9827565 2.1 2002/09/24 09:32:14 33 21.1 N 116 22.2 W 15.2 11 km ( 7 mi) N of Borrego Springs, CA
9827705 2.5 2002/09/24 17:41:35 33 44.9 N 116 1.5 W 9.3 18 km (11 mi) ENE of Indio, CA
9828117 2.1 2002/09/25 22:31:40 34 59.4 N 116 57.1 W 7.1 13 km ( 8 mi) NNE of Barstow, CA
9828217 2.2 2002/09/26 07:49:55 33 58.6 N 117 12.9 W 16.9 9 km ( 5 mi) SSE of Loma Linda, CA
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September 25, 2002
Commentary
A very small quake (M1.7) has been felt today in Culver City. The time was 11:59 am & the epicenter was lcoated in Culver City, 2 miles west-southwest of Baldwin Hills.
September 23, 2002
Commentary
Early this morning, at 1:13 am, a quake in Mexico was felt in the Imperial Valley area. This quake had a magnitude of M3.6 & was located 34 miles south of Calexico. There was a M3.1 aftershock nearby at 8:41 am.
Commentary
On Saturday, there was a widely felt quake in the Borrego Badlands, 6 miles north of Ocotillo Wells. The time was 2:26 pm & the magnitude was M4.1. Focal mechanism was strike-slip. This quake was felt from the U.S./Mexico border to Corona & Twentynine Palms.
September 20, 2002
Commentary
Southern California Earthquakes in the Past Week
Kate Hutton ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
September 20, 2002
Kate Hutton ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
September 20, 2002
The time period covered is 5 pm on Thursday, September 12 (PDT)
through 5 pm on Thursday, September 19 (PDT). During this period
we dectected and analysed 196 earthquakes. Click
here to see a map.
The table below lists the quakes during the past week
that were M2.0 or larger in the central part of the coverage area.
Times are local times; if you want Greenwich Mean Time, add 7 hrs
to the Pacific Daylight Time or 8 hrs to the Pacific Standard Time
listed.
Mag. Local Date Local Time Lat. Long. Depth Descriptive location
-------------------------------------------------------------------------------------------
13812836 2.6 2002/09/14 12:35:28 35 16.2 N 118 32.8 W 6.7 18 km (11 mi) NNW of Tehachapi, CA
13812864 1.9 2002/09/14 14:04:05 35 19.1 N 118 30.8 W 6.6 22 km (13 mi) NNW of Tehachapi, CA
13813108 2.5 2002/09/15 08:50:52 32 16.2 N 115 16.4 W 7.0 49 km (30 mi) SSE of Calexico, CA
13813192 3.3 2002/09/15 14:15:50 34 3.3 N 116 19.2 W 10.5 9 km ( 6 mi) S of Joshua Tree, CA
FELT in Joshua Tree, Desert Hot Springs, Palm Springs.
13813252 2.0 2002/09/15 19:05:08 32 35.4 N 116 10.9 W 4.9 24 km (15 mi) SW of Ocotillo, CA
13813324 2.2 2002/09/16 04:43:11 34 3.3 N 116 19.0 W 10.6 9 km ( 6 mi) S of Joshua Tree, CA
13813696 3.7 2002/09/17 08:00:05 33 30.2 N 116 46.7 W 16.0 11 km ( 7 mi) WSW of Anza, CA
FELT from El Cajon to Cajon Pass, Max MMI IV.
13813760 2.8 2002/09/17 10:07:01 33 30.5 N 116 46.8 W 16.0 11 km ( 7 mi) WSW of Anza, CA
FELT in Hemet, Idyllwild & Temecula.
13819588 2.1 2002/09/17 18:04:42 33 10.8 N 115 36.2 W 2.1 3 km ( 2 mi) ENE of Obsidian Butte, CA
13819632 2.0 2002/09/17 19:25:42 32 21.8 N 115 15.0 W 7.0 41 km (25 mi) SE of Calexico, CA
13819680 2.2 2002/09/17 22:23:30 33 12.0 N 116 2.1 W 16.4 11 km ( 7 mi) NE of Ocotillo Wells, CA
13819688 2.2 2002/09/17 23:28:49 36 28.2 N 118 18.7 W 9.7 12 km ( 8 mi) S of Mt. Whitney, CA
13819712 2.0 2002/09/18 01:17:39 34 25.0 N 116 28.9 W 12.6 33 km (21 mi) N of Yucca Valley, CA
13820028 2.7 2002/09/18 15:50:53 33 55.6 N 119 53.3 W 18.2 17 km (10 mi) SSE of Santa Cruz Is.
13820052 2.9 2002/09/18 20:00:25 33 47.0 N 118 30.4 W 14.8 8 km ( 5 mi) W of Palos Verdes Point, CA
FELT in South Bay cities, Palos Verdes to Santa Monica.
Max MMI IV.
13820088 3.8 2002/09/18 23:21:04 34 52.0 N 116 23.7 W 3.5 53 km (33 mi) SSW of Baker, CA
FELT in Victorville, Landers areas. Max MMI III
13820196 2.1 2002/09/19 08:59:10 33 9.4 N 115 38.0 W 3.6 1 km ( 1 mi) SSE of Obsidian Butte, CA
13820200 2.8 2002/09/19 08:59:55 33 9.8 N 115 38.2 W 4.1 1 km ( 0 mi) S of Obsidian Butte, CA
9826245 2.0 2002/09/19 14:28:17 36 2.5 N 117 52.8 W 3.5 6 km ( 4 mi) E of Coso Junction, CA
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September 19, 2002
Commentary
We have another M2.8 in the northern Imperial Valley, about a half mile south of Obsidian Butte, or 9 miles north or Westmorland. The magnitude was M2.8 & the time was 8:59 am. So far, we have no “felt reports”.
Commentary
Just after 8:00 pm last night, there was a M2.8 offshore that was widely felt in the South Bay area. The epicenter was located 5 miles west-northwest of Palos Verdes Point. A partial list of town where it was felt are: Palos Verdes Estates, Rancho Palos Verdes, Hermosa Beach, Redondo Beach, Manhattan Beach, Torrance & Gardena. The peak Modified Mercalli intensity was IV.
Also last night, at 11:21 pm, there was a M3.5 Hector Mines aftershock, located 33 miles southwest of Baker or 35 miles east of Barstow. This quake was reported felt in the Victorville area & the Lucerne Valley area. The focal mechanism was strike-slip.
Commentary
There was another M3 quake this morning: at 10:46 am, 12 miles south-southwest of Ludlow, magnitude M3.0. It was an aftershock of the October 1999 Hector Mines quake, Mw7.1. We don’t have any “felt reports” yet. We might not get any, because of the remote location.
Another, smaller, quake might have been felt. This was a M2.5 at 7:39 pm last night, located 3 miles south east of the town of Big Bear Lake.