SCSN Earthquake Commentary

January 31, 2003

Commentary

Filed under: Old Commentary — kate @ 7:01 am

Another quite small quake was felt by several people early this morning in the Santa Maria area. It was a M2.1 at 4:27 am, located 8 miles south of Santa Maria.

January 30, 2003

Commentary

Filed under: Old Commentary — kate @ 7:45 am

A small (M2.4) quake was felt last night in the Culver City, Santa Monica, West Hollywood areas & parts of Los Angeles. The quake occurred at 9:52 pm & was located 2 miles north-northeast of the Baldwin Hills, or 3 miles northeast of Culver City.

Commentary

Filed under: Weekly — kate @ 12:00 am



Southern California Earthquakes in the Past Week


Nick Scheckel
,

Seismological Laboratory

Lucy Jones,

U. S. Geological Survey

California Institute of Technology

January 30, 2003


The time period covered is 5 pm on Thursday, January 23 (PST)
through 5 pm on Thursday, January 30 (PST). During this period
we dectected and analysed 291 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
-------------------------------------------------------------------------------------------
 9882285  2.0  2003/01/24 23:54:26 35 19.5 N 118 41.0 W  5.6   19 km (12 mi) NE   of Arvin, CA
 9882293  2.7  2003/01/25 00:01:48 35 19.8 N 118 39.8 W  3.4   20 km (13 mi) NE   of Arvin, CA
 9882305  2.6  2003/01/25 00:10:58 35 20.1 N 118 40.1 W  5.6   20 km (13 mi) NE   of Arvin, CA
 9882309  2.4  2003/01/25 00:55:37 35 19.7 N 118 39.8 W  5.6   20 km (13 mi) NE   of Arvin, CA
 9882321  2.0  2003/01/25 01:06:40 35 19.5 N 118 41.4 W  5.6   18 km (11 mi) NE   of Arvin, CA
 9882325  3.9  2003/01/25 01:11:02 35 19.5 N 118 39.7 W  5.6   20 km (12 mi) NE   of Arvin, CA
          Felt in the Bakersfield & Tehachapi areas
 9882329  4.5  2003/01/25 01:16:10 35 19.1 N 118 39.2 W  5.6   20 km (12 mi) NE   of Arvin, CA
          Felt in the Bakersfield & Tehachapi areas
 9882337  2.1  2003/01/25 01:20:17 35 19.1 N 118 38.8 W  5.4   21 km (13 mi) NE   of Arvin, CA
 9882341  2.0  2003/01/25 01:20:59 35 19.0 N 118 39.6 W  5.6   20 km (12 mi) NE   of Arvin, CA
 9882353  2.3  2003/01/25 01:51:19 35 18.8 N 118 38.7 W  5.6   21 km (13 mi) NE   of Arvin, CA
 9882357  2.4  2003/01/25 02:11:36 35 18.9 N 118 39.6 W  4.7   19 km (12 mi) NE   of Arvin, CA
 9882369  2.4  2003/01/25 03:09:17 35 19.0 N 118 38.5 W  3.6   21 km (13 mi) NE   of Arvin, CA
 9882401  2.1  2003/01/25 05:03:08 34 35.3 N 116 16.7 W  4.7   50 km (31 mi) N    of Joshua Tree, CA
 9882481  2.1  2003/01/25 12:30:27 35 19.0 N 118 39.5 W  5.6   20 km (12 mi) NE   of Arvin, CA
 9882513  2.0  2003/01/25 14:58:43 35 20.1 N 118 41.9 W  5.6   19 km (12 mi) NE   of Arvin, CA
 9882533  2.6  2003/01/25 18:50:04 33 15.4 N 116  6.7 W 13.2   13 km ( 8 mi) N    of Ocotillo Wells, CA
 9882545  3.0  2003/01/25 21:30:22 35 18.9 N 118 39.1 W  4.2   20 km (12 mi) NE   of Arvin, CA
 9882625  2.8  2003/01/25 21:32:57 35 19.0 N 118 39.3 W  5.3   20 km (12 mi) NE   of Arvin, CA
 9882657  2.0  2003/01/25 21:37:52 35 19.0 N 118 39.9 W  5.6   19 km (12 mi) NE   of Arvin, CA
 9882749  2.4  2003/01/25 22:18:30 35 18.9 N 118 39.5 W  5.6   20 km (12 mi) NE   of Arvin, CA
 9882757  2.9  2003/01/25 22:29:11 35 18.7 N 118 39.0 W  3.1   20 km (12 mi) NE   of Arvin, CA
 9882769  2.5  2003/01/25 23:36:21 35 18.6 N 118 38.6 W  3.9   20 km (13 mi) NE   of Arvin, CA
 9882817  2.6  2003/01/26 08:01:05 33 52.3 N 119 25.2 W 13.3   20 km (12 mi) SSE  of Santa Cruz Is.
 9883181  2.4  2003/01/27 06:43:06 36  3.8 N 117 38.7 W  2.3   27 km (17 mi) E    of Coso Junction, CA
 9883301  2.5  2003/01/27 11:15:33 32  0.2 N 116 16.8 W  7.0   86 km (53 mi) SSW  of Ocotillo, CA
 9883333  2.6  2003/01/27 13:48:54 34 52.9 N 120 25.6 W  2.1    8 km ( 5 mi) S    of Santa Maria, CA
          Felt in the Santa Maria area (with a couple of isolated reports from Santa Barbara & San
          Simeon)
 9883349  2.0  2003/01/27 15:26:09 36 11.4 N 118  0.9 W  5.0   10 km ( 6 mi) S    of Olancha, CA
 9883429  2.2  2003/01/28 02:52:36 35 19.2 N 118 39.2 W  2.3   20 km (13 mi) NE   of Arvin, CA
 9883521  2.2  2003/01/28 11:56:52 34  2.0 N 117 15.3 W 17.8    2 km ( 1 mi) S    of Loma Linda, CA
 9883549  2.4  2003/01/28 13:23:19 32 15.3 N 115 47.7 W  7.0   54 km (33 mi) SSW  of Calexico, CA
 9883577  2.6  2003/01/28 15:04:34 32 18.0 N 115 18.8 W  7.0   44 km (28 mi) SSE  of Calexico, CA
 9883593  2.2  2003/01/28 16:10:09 35 20.1 N 118 40.0 W  3.2   20 km (13 mi) NE   of Arvin, CA
 9883621  2.1  2003/01/28 18:04:59 35 20.2 N 118 40.1 W  3.1   21 km (13 mi) NE   of Arvin, CA
 9883697  2.9  2003/01/28 18:19:48 35 19.7 N 118 40.1 W  2.6   20 km (12 mi) NE   of Arvin, CA
12144203  2.5  2003/01/28 18:20:15 35 19.2 N 118 40.6 W  5.1   19 km (12 mi) NE   of Arvin, CA
 9883701  3.0  2003/01/28 18:21:20 35 19.9 N 118 40.2 W  2.1   20 km (12 mi) NE   of Arvin, CA
          Felt in Bear Valley Springs & California City
 9883737  2.0  2003/01/28 20:45:41 35 19.8 N 118 40.9 W  2.5   19 km (12 mi) NE   of Arvin, CA
 9883741  2.6  2003/01/28 20:48:53 35 18.4 N 118 38.2 W  2.5   21 km (13 mi) ENE  of Arvin, CA
 9883745  2.3  2003/01/28 21:11:16 35  2.1 N 118 58.5 W  5.6    4 km ( 3 mi) NW   of Wheeler Ridge, CA
 9883749  2.6  2003/01/28 21:17:18 35 20.1 N 118 40.6 W  2.7   20 km (12 mi) NE   of Arvin, CA
 9883757  2.1  2003/01/28 21:33:57 35 20.2 N 118 40.7 W  2.4   20 km (12 mi) NE   of Arvin, CA
 9883761  2.5  2003/01/28 21:34:15 35 20.0 N 118 41.5 W  3.9   19 km (12 mi) NE   of Arvin, CA
 9883765  2.9  2003/01/28 21:35:10 35 19.4 N 118 41.6 W  5.5   18 km (11 mi) NE   of Arvin, CA
          Felt in Bear Valley Springs & California City
 9883769  2.5  2003/01/28 22:52:21 35 18.6 N 118 38.4 W  2.6   21 km (13 mi) ENE  of Arvin, CA
 9883781  2.2  2003/01/28 22:57:01 35 48.3 N 118  2.8 W  8.6   28 km (17 mi) SSW  of Coso Junction, CA
 9883841  2.3  2003/01/29 05:00:53 35 18.4 N 118 38.8 W  2.2   20 km (12 mi) NE   of Arvin, CA
 9884153  2.1  2003/01/29 15:33:14 35 18.9 N 118 39.2 W  5.6   20 km (12 mi) NE   of Arvin, CA
 9884193  2.4  2003/01/29 21:52:32 34  1.4 N 118 21.5 W 12.4    2 km ( 2 mi) NNE  of Baldwin Hills, CA
          Felt in Culver City, Santa Monica, West Hollywood areas & parts of Los Angeles
 9884217  2.0  2003/01/30 00:54:05 35 20.8 N 118 37.9 W  0.4   24 km (15 mi) NE   of Arvin, CA
13930332  2.1  2003/01/30 09:30:35 35 20.0 N 118 40.6 W  2.4   20 km (12 mi) NE   of Arvin, CA
13930360  2.8  2003/01/30 11:28:12 35 18.3 N 118 38.4 W  2.0   20 km (13 mi) ENE  of Arvin, CA
-------------------------------------------------------------------------------------------


January 29, 2003

Commentary

Filed under: Old Commentary — kate @ 8:17 am

Two small members of the Arvin sequence, a M2.9 at 6:19 pm and a M3.0 at 6:21 pm, were felt in Bear Valley Springs & California City early yesterday evening. As with the others, these quakes occurred 12 miles northeast of Arvin.

Readers should note that the Arvin swarm is not unprecedented. In late 1983 & early 1984, the Durwood swarm, 20 miles north of Lake Isabella, went on for about 6 months. The largest event in the Durwood swarm was M4.5.

January 28, 2003

Commentary

Filed under: Old Commentary — kate @ 6:26 am

Yesterday afternoon, at 1:48 pm, a small quake was felt in the Santa Maria area (with a couple of isolated reports from Santa Barbara & San Simeon). The epicenter was located 5 miles south of Santa Maria & the magnitude was M2.6.

January 25, 2003

Commentary

Filed under: Old Commentary — kate @ 1:55 am

We had another pair of twin quakes in the Arvin area (12 miles NE of Arvin, near Caliente). There was a M3.7 (later updated to M3.9) quake at 1:11 am followed by a M4.2 (later updated to M4.5) quake just five minutes later at 1:16 am. Both events were reported felt in the Bakersfield & Tehachapi areas. The larger of the two showed a peak intensity of Modified Mercalli V in the epicentral area & stimulated sporadic “felt reports” from as far away as Santa Monica. So far, these are the largest quakes of a continuing swarm in the Arvin area (which also produced a pair of M3.6 events on January 2). The focal mechanism for the M4.5 is thrust.

January 24, 2003

Commentary

Filed under: Old Commentary — kate @ 6:38 am

There were some very sensitive people in the Culver City area yesterday: we got several “felt” calls on a M1.9 at 5:09 pm, located 1 mile northeast of Culver City, in the Baldwin Hills. The reports came from Culver City & portions of Los Angeles.

January 23, 2003

Commentary

Filed under: Weekly — kate @ 12:00 am



Southern California Earthquakes in the Past Week


Anthony Guarino
,

Seismological Laboratory

Lucy Jones,

U. S. Geological Survey

California Institute of Technology

January 23, 2003


The time period covered is 4 pm on Thursday, January 16 (PST)
through 4 pm on Thursday, January 23 (PST). During this period
we dectected and analysed 214 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
-------------------------------------------------------------------------------------------

 9880613  2.5  2003/01/16 10:21:11 34 15.2 N 117 33.6 W  7.1    9 km ( 6 mi) ESE  of Mt. Baldy, CA
 9880657  2.1  2003/01/16 13:01:45 34 31.5 N 118 46.1 W 16.7   14 km ( 9 mi) W    of Castaic Lake dam, CA
 9880749  2.3  2003/01/16 21:30:05 32 29.2 N 115 29.2 W 12.0   20 km (13 mi) S    of Calexico, CA
 9880769  2.1  2003/01/17 00:05:15 35 18.7 N 118 38.2 W  2.2   21 km (13 mi) NE   of Arvin, CA
 9880781  2.8  2003/01/17 02:05:34 35 18.9 N 118 39.3 W  1.5   20 km (12 mi) NE   of Arvin, CA
 9880785  2.7  2003/01/17 02:09:04 35 18.9 N 118 39.6 W  1.2   19 km (12 mi) NE   of Arvin, CA
 9880805  2.0  2003/01/17 03:48:03 35 19.4 N 118 40.2 W  1.5   19 km (12 mi) NE   of Arvin, CA
 9880821  2.4  2003/01/17 04:18:00 35 19.5 N 118 39.6 W  1.5   20 km (13 mi) NE   of Arvin, CA
 9880825  2.1  2003/01/17 04:21:56 35 19.5 N 118 39.8 W  1.7   20 km (12 mi) NE   of Arvin, CA
 9880937  2.1  2003/01/17 14:44:41 33 49.5 N 117 39.6 W  5.0   10 km ( 6 mi) WSW  of Corona, CA
 9881009  2.2  2003/01/17 21:13:10 35 18.9 N 118 39.9 W  1.7   19 km (12 mi) NE   of Arvin, CA
 9881041  3.1  2003/01/18 02:43:37 34 18.0 N 118 34.7 W  2.1    5 km ( 3 mi) NNE  of Chatsworth, CA
 FELT IN SAN FERNANDO VALLEY AND SIMI VALLEY
 9881137  2.4  2003/01/18 18:11:10 33 49.5 N 117 39.1 W  5.2   10 km ( 6 mi) SW   of Corona, CA
 9881145  2.1  2003/01/18 18:21:47 36 20.6 N 118  6.2 W  5.6   11 km ( 7 mi) NW   of Olancha, CA
 9881177  2.0  2003/01/19 01:33:40 32 13.5 N 116  7.5 W  7.0   58 km (36 mi) SSW  of Ocotillo, CA
 9881205  2.1  2003/01/19 05:57:23 34 19.2 N 116 50.8 W  5.5    6 km ( 4 mi) N    of Big Bear City, CA
 9881209  2.1  2003/01/19 06:51:30 32 13.8 N 115 46.7 W  7.0   56 km (35 mi) SSW  of Calexico, CA
 9881241  2.1  2003/01/19 11:02:42 34 25.7 N 116 15.4 W  7.5   33 km (20 mi) N    of Joshua Tree, CA
 9881261  2.2  2003/01/19 14:01:48 34 19.4 N 116 50.9 W  5.3    6 km ( 4 mi) N    of Big Bear City, CA
 9881269  3.1  2003/01/19 14:59:46 32 12.1 N 115 47.9 W  7.0   59 km (37 mi) SSW  of Calexico, CA
 9881373  3.4  2003/01/20 06:57:02 32 46.1 N 115 33.0 W 21.6    3 km ( 2 mi) S    of El Centro, CA
 FELT IN EL CENTRO, CALEXICO, AND HEBER
 9881473  2.2  2003/01/20 16:20:27 34  0.3 N 118 22.1 W 15.5    0 km ( 0 mi) ENE  of Baldwin Hills, CA
 FELT IN BALDWIN HILLS
 9881485  2.4  2003/01/20 18:24:16 32 14.8 N 115 48.8 W  7.0   56 km (35 mi) SSW  of Calexico, CA
 9881545  2.0  2003/01/21 02:10:22 34  2.0 N 117 15.0 W 19.7    2 km ( 1 mi) S    of Loma Linda, CA
 9881557  2.1  2003/01/21 05:08:02 36 39.8 N 117 11.4 W  7.0    8 km ( 5 mi) NNW  of Stovepipe Wells, CA
 9881613  2.5  2003/01/21 09:07:21 36 10.9 N 118  1.3 W  5.6   11 km ( 7 mi) S    of Olancha, CA
 9881689  2.6  2003/01/21 18:29:41 34  0.2 N 116 45.8 W 22.2    9 km ( 6 mi) NNE  of Cabazon, CA
 FELT IN CABAZON AND PALM SPRINGS
 9881745  2.1  2003/01/22 04:37:29 33 53.1 N 116 15.5 W 11.6   19 km (12 mi) NNW  of Indio, CA
 9881873  3.0  2003/01/22 12:28:22 33 53.7 N 118 33.0 W 13.6   12 km ( 7 mi) WSW  of Los Angeles Airport, CA
 FELT IN SANTA MONICA, VENICE, AND SURROUNDING BEACH COMMUNITIES 

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


January 22, 2003

Commentary

Filed under: Old Commentary — kate @ 1:19 pm

A quake was felt in the Santa Monica & Venice areas & other beach communities at 12:28 pm today (just after noon). It was a M3.0, which occurred offshore, 8 miles west-southwest of Los Angeles airport.

Commentary

Filed under: Old Commentary — kate @ 6:14 am

Upon further inspection, the Cabazon quake yesterday evening was M2.6. The real-time computer was apparently confused by the waves coming in from the Mexico earthquake. Our M2.6 quake occurred at 6:29 pm, 6 miles north-northeast of Cabazon. It was felt in Palm Springs.

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