There was a M3.7 very early this morning in the high desert, 19 miles
west-southwest of Ludlow. The time was 1:31 am & the quake was felt
in the Big Bear/Lake Arrowhead areas. The epicenter of this quake
coincides with a small, subsidiary fault in the Landers rupture
(June 1992), so it could be considered a Landers aftershock. (Landers
was a Mw7.3 quake, and could easily have occasional aftershocks 10
years later. In fact, one can often trace it’s faint aftershock
sequence on current weekly maps.)
July 31, 2002
Commentary
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July 29, 2002
Commentary
We had another small quake at 10:37 am this morning: a M2.9 located in the Anza Borrego Desert area, 17 miles south-southwest of
Ocotillo Wells, or 24 miles east-southeast of Julian. It’s sort of
an isolated area, so we may not get any “felt reports”.
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Commentary
Two small quakes were felt in southern California over the weekend.
The first occurred just slightly offshore, 3 miles west of Leo
Carrillo State Beach, at 5:08 pm on Friday. Magnitude was M2.7.
It was reported felt in Newbury Park.
The second small quake occurred late Saturday, at 10:47 pm, 4 miles
north of Fontana. Magnitude was M2.6. It was felt in Rancho
Cucamonga, Rialto & Alta Loma. This quake was an aftershock of
Wednesday’s M3.7 at the same location.
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July 26, 2002
Commentary
There was a small quake (M2.9) early this morning, just before 12:18
am. The location was in the mountains 7 miles southwest of Frazier
Park. It was reported felt in the Frazier Park & Gorman areas.
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July 25, 2002
Commentary
Yesterday at 5:43pm quite a few people in San Bernardino and Riverside counties shook from a M3.7 earthquake that occurred 4 miles north of Fontana. It occurred along the northern end of the San Jacinto fault, but since the quake was too small to cause any defining surface rupturing we can’t be positive in naming the guilty fault. The focal mechanism shows that (whichever fault it was) it had basically strike-slip movement, meaning that the ground moved (for the most part) horizontally rather than vertically. A quake this size is expected to cause light to moderate shaking with very little or no damage.
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Commentary
Southern California Earthquakes in the Past Week
Nick Scheckel ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
July 25, 2002
Nick Scheckel ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
July 25, 2002
The time period covered is 5 pm on Thursday, July 18 (PDT)
through 5 pm on Thursday, July 25 (PDT). During this period
we dectected and analysed 236 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
-------------------------------------------------------------------------------------------
13688380 2.2 2002/07/19 19:20:43 33 9.8 N 115 30.6 W 7.0 4 km ( 3 mi) N of Calipatria, CA
13688508 2.1 2002/07/20 10:32:50 36 11.3 N 117 59.6 W 5.6 11 km ( 7 mi) S of Olancha, CA
9802565 2.8 2002/07/20 13:37:00 36 11.3 N 117 59.3 W 7.0 11 km ( 7 mi) S of Olancha, CA
9802569 2.0 2002/07/20 14:28:20 32 55.7 N 116 17.3 W 13.2 28 km (17 mi) SSW of Ocotillo Wells, CA
9802613 2.5 2002/07/20 22:03:33 36 11.0 N 117 59.6 W 5.6 11 km ( 7 mi) S of Olancha, CA
9802709 2.2 2002/07/21 05:45:12 36 1.6 N 117 52.8 W 5.3 6 km ( 4 mi) ESE of Coso Junction, CA
9802741 2.3 2002/07/21 06:59:01 36 11.1 N 117 59.6 W 4.3 11 km ( 7 mi) S of Olancha, CA
9802745 2.1 2002/07/21 06:59:52 36 11.1 N 117 59.4 W 5.6 11 km ( 7 mi) S of Olancha, CA
9802753 2.5 2002/07/21 07:37:09 35 46.8 N 117 39.4 W 5.0 18 km (11 mi) N of Ridgecrest, CA
9802885 2.3 2002/07/21 17:17:38 35 51.3 N 119 47.1 W 7.0 49 km (30 mi) ENE of Cholame, CA
9802925 2.9 2002/07/21 21:33:27 34 19.4 N 116 50.3 W 4.2 7 km ( 4 mi) NNE of Big Bear City, CA
9803293 2.4 2002/07/23 02:38:21 33 18.5 N 116 16.9 W 8.7 10 km ( 6 mi) NE of Borrego Springs, CA
9803433 2.6 2002/07/23 10:36:16 32 22.6 N 115 2.0 W 7.0 52 km (33 mi) SW of Yuma, AZ
13692356 2.2 2002/07/23 20:26:55 32 29.3 N 115 15.2 W 7.0 30 km (19 mi) SE of Calexico, CA
13692360 2.4 2002/07/23 21:56:58 35 46.7 N 117 39.6 W 5.3 17 km (11 mi) N of Ridgecrest, CA
13692424 2.1 2002/07/24 07:29:40 33 49.0 N 118 27.3 W 14.9 5 km ( 3 mi) NNW of Palos Verdes Point, CA
13692444 2.9 2002/07/24 08:15:45 36 16.4 N 116 21.7 W 7.0 34 km (21 mi) NNW of Shoshone, CA
9509094 2.3 2002/07/24 10:32:20 34 0.9 N 117 4.9 W 16.4 5 km ( 3 mi) WSW of Yucaipa, CA
13692560 2.1 2002/07/24 12:44:56 33 11.9 N 116 43.7 W 7.6 4 km ( 3 mi) ENE of Mesa Grande, CA
13692608 2.3 2002/07/24 15:46:36 34 51.5 N 116 23.9 W 4.9 54 km (34 mi) SSW of Baker, CA
13692644 3.7 2002/07/24 17:43:15 34 9.7 N 117 25.7 W 6.5 6 km ( 4 mi) N of Fontana, CA
13692716 2.1 2002/07/25 05:34:27 34 59.3 N 116 56.7 W 8.7 13 km ( 8 mi) NNE of Barstow, CA
-------------------------------------------------------------------------------------------
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July 24, 2002
Commentary
There was a M2.9 quake in Death Valley this morning, at 8:15 am. The
epicenter was 4 miles southeast of Death Valley Junction, or 21 miles
north-northwest of Shoshone CA, or 22 miles west-northwest of
Pahrump NV. It may not be reported as felt, due to its remote
location.
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July 22, 2002
Commentary
A small quake was felt last night in the Big Bear area at 9:33 pm.
The epicenter was 4 miles north-northeast of Big Bear City & the
magnitude was M2.9.
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July 19, 2002
Commentary
Southern California Earthquakes in the Past Week
Kate Hutton ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
July 19, 2002
Kate Hutton ,
Seismological Laboratory
Lucy Jones,
U. S. Geological Survey
California Institute of Technology
July 19, 2002
The time period covered is 5 pm on Thursday, July 11 (PDT)
through 5 pm on Thursday, July 18 (PDT). During this period
we dectected and analysed 209 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
-------------------------------------------------------------------------------------------
9800385 2.2 2002/07/11 22:05:53 34 50.9 N 116 24.3 W 2.9 55 km (34 mi) SSW of Baker, CA
9800405 2.2 2002/07/11 23:31:55 34 50.8 N 116 24.3 W 3.4 56 km (34 mi) SSW of Baker, CA
9800533 2.6 2002/07/12 14:18:18 36 26.9 N 117 57.6 W 3.2 19 km (12 mi) NNE of Olancha, CA
9800537 2.4 2002/07/12 14:34:36 34 19.3 N 116 50.2 W 4.2 7 km ( 4 mi) NNE of Big Bear City, CA
9800545 2.5 2002/07/12 15:00:57 34 19.2 N 116 50.2 W 4.0 6 km ( 4 mi) NNE of Big Bear City, CA
9800737 2.0 2002/07/13 15:28:16 36 28.3 N 117 58.7 W 10.7 16 km (10 mi) SSE of Lone Pine, CA
9800769 2.4 2002/07/13 18:25:32 36 3.9 N 117 38.9 W 2.8 27 km (17 mi) E of Coso Junction, CA
9800821 2.0 2002/07/14 01:04:44 34 14.7 N 117 33.9 W 8.0 9 km ( 6 mi) ESE of Mt. Baldy, CA
9800957 2.4 2002/07/14 22:43:01 36 4.5 N 117 53.8 W 2.4 6 km ( 4 mi) NE of Coso Junction, CA
9801005 2.5 2002/07/15 05:21:48 36 27.4 N 117 57.9 W 5.5 19 km (12 mi) SSE of Lone Pine, CA
13672572 2.7 2002/07/15 21:41:13 33 22.2 N 116 23.3 W 4.3 13 km ( 8 mi) N of Borrego Springs, CA
13672612 1.9 2002/07/16 04:18:42 34 41.6 N 116 18.3 W 3.1 62 km (38 mi) N of Joshua Tree, CA
13683432 2.0 2002/07/16 19:03:10 32 8.7 N 116 22.0 W 7.0 74 km (46 mi) SSW of Ocotillo, CA
13687488 2.2 2002/07/17 04:00:49 33 48.8 N 116 52.9 W 16.6 11 km ( 7 mi) NE of Hemet, CA
13687520 2.2 2002/07/17 06:16:35 34 19.5 N 116 50.2 W 4.1 7 km ( 4 mi) NNE of Big Bear City, CA
13687808 2.1 2002/07/17 18:41:35 36 26.5 N 117 58.7 W 7.0 18 km (11 mi) N of Olancha, CA
13687868 2.1 2002/07/18 03:03:33 32 54.3 N 115 58.8 W 9.7 19 km (12 mi) N of Ocotillo, CA
13687872 2.0 2002/07/18 03:14:47 34 42.4 N 116 18.0 W 2.4 63 km (39 mi) N of Joshua Tree, CA
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Commentary
Another small quake of interest occurred at 8:15 am this morning,
23 miles southwest of Ridgecrest, near the Garlock fault. The
magnitude was M2.7. It was probably felt in the California City and
Ridgecrest areas, but so far we have no reports.
There was another, M3.1, in central California at 11:53 am. This
quake (according the Menlo Park) was located 16 miles south of
Kettleman City, or 31 miles southeast of Coalinga.