SCSN Earthquake Commentary

September 30, 2001

Commentary

Filed under: Old Commentary — kate @ 8:11 pm

Three unrelated small quakes of interest occurred overnight:

The first was a M3.0 at 11:51 pm last night, 4 miles southeast of
Mt. San Gorgonio (in the San Gorgonio Pass area).

The second was a M2.9 at 4:50 am this morning, 9 miles south of Taft,
or 35 miles southwest of Bakersfield.

The third was a M2.9 at 5:32 am this morning, in the Brawley Seismic
Zone (Imperial Valley), 2 miles east-northeast of Obsidian Butte.
Since they were all in sparsely inhabited areas, we have not “felt”
reports.

September 28, 2001

Commentary

Filed under: Weekly — kate @ 12:00 am



Southern California Earthquakes in the Past Week


Kate Hutton ,

Seismological Laboratory
Lucy Jones,

U. S. Geological Survey
California Institute of Technology

September 28, 2001

The time period covered is 5 pm on Thursday, September 20 (PDT)
through 5 pm on Thursday, September 27 (PDT). During this period
we dectected and analysed 268 earthquakes. Click
here to see a map.

The table below lists the quakes during the past week
that were M2.5 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
      -------------------------------------------------------------------------------------------
 9707785  2.9  2001/09/20 18:09:40 32 55.8 N 117 45.4 W  7.0   46 km (28 mi) SW   of Oceanside, CA
 9707793  2.1  2001/09/20 18:15:52 32 56.6 N 117 45.4 W  7.0   45 km (28 mi) SW   of Oceanside, CA
 9708025  2.3  2001/09/21 18:51:51 32 46.9 N 115 33.2 W 15.0    1 km ( 1 mi) S    of El Centro, CA
 9708093  2.1  2001/09/22 05:11:21 34 20.8 N 116 38.6 W  5.6   21 km (13 mi) ENE  of Big Bear City, CA
 9708257  2.2  2001/09/22 22:16:18 34 16.0 N 116 27.6 W  3.0   16 km (10 mi) N    of Yucca Valley, CA
 9708281  2.0  2001/09/23 03:29:05 33 58.7 N 116 17.4 W  5.3   18 km (11 mi) S    of Joshua Tree, CA
 9708321  2.0  2001/09/23 07:47:44 36  0.4 N 117 48.7 W  2.2   13 km ( 8 mi) ESE  of Coso Junction, CA
 9708333  1.9  2001/09/23 08:03:12 36  0.7 N 117 49.0 W  1.9   12 km ( 8 mi) ESE  of Coso Junction, CA
 9708341  2.2  2001/09/23 08:27:37 33 12.6 N 115 35.1 W 12.0    6 km ( 4 mi) NE   of Obsidian Butte, CA
 9708393  3.0  2001/09/23 15:44:32 33 30.5 N 116 30.8 W 15.1   16 km (10 mi) ESE  of Anza, CA
 9708497  2.5  2001/09/24 04:34:58 34 18.8 N 116 52.0 W  3.7    6 km ( 3 mi) NNW  of Big Bear City, CA
 9708533  2.3  2001/09/24 08:17:39 33 50.0 N 117 50.4 W 10.3    5 km ( 3 mi) NNE  of Orange, CA
               Felt in Orange, Fullerton, Anaheim, Anaheim Hills, Placentia
 9708577  2.5  2001/09/24 10:50:17 35 59.7 N 118 20.5 W  5.6   36 km (22 mi) W    of Coso Junction, CA
11988123  2.0  2001/09/24 11:58:53 35 19.6 N 118 39.9 W  5.3   20 km (12 mi) NE   of Arvin, CA
 9708645  2.7  2001/09/24 16:02:27 35 23.4 N 120 39.6 W  0.0    5 km ( 3 mi) W    of Santa Margarita, CA
 9708665  2.1  2001/09/24 20:51:49 36  0.7 N 117 53.1 W  4.7    7 km ( 4 mi) ESE  of Coso Junction, CA
 9708673  2.0  2001/09/24 21:35:54 33 56.4 N 118 18.8 W 14.8    3 km ( 2 mi) SSE  of Inglewood, CA
 9708693  2.2  2001/09/24 23:26:03 35 23.8 N 120 41.3 W  0.4    8 km ( 5 mi) W    of Santa Margarita, CA
 9708697  2.2  2001/09/25 00:47:39 32 20.7 N 115 13.3 W  7.0   44 km (27 mi) SE   of Calexico, CA
 9708725  2.3  2001/09/25 04:26:18 34 40.4 N 116 17.2 W  8.7   60 km (37 mi) N    of Joshua Tree, CA
 9708729  3.1  2001/09/25 04:35:14 36  5.3 N 117 53.6 W  0.1    7 km ( 4 mi) NE   of Coso Junction, CA
 9708813  3.0  2001/09/25 11:34:08 36 26.6 N 117 51.9 W  5.7   22 km (14 mi) NE   of Olancha, CA
 9708849  2.2  2001/09/25 13:41:01 34 36.9 N 116 14.4 W  4.8   54 km (33 mi) N    of Joshua Tree, CA
 9708929  2.1  2001/09/25 15:49:34 35 19.6 N 118 39.6 W  5.5   20 km (13 mi) NE   of Arvin, CA
 9708973  2.0  2001/09/25 22:42:06 34 54.4 N 119  1.2 W 14.4    9 km ( 6 mi) WSW  of Grapevine, CA
 9708981  2.3  2001/09/25 23:01:15 32 20.4 N 115 15.1 W  7.0   43 km (27 mi) SSE  of Calexico, CA
 9708989  1.9  2001/09/25 23:14:43 34 15.3 N 116 45.8 W  3.9    8 km ( 5 mi) E    of Big Bear City, CA
 9709061  2.8  2001/09/26 06:37:55 34 22.3 N 116  8.6 W  5.4   27 km (17 mi) NNW  of Twentynine Palms, CA
 9709129  2.2  2001/09/26 12:02:40 33 12.5 N 115 35.8 W  2.2    6 km ( 4 mi) NE   of Obsidian Butte, CA
11992187  2.0  2001/09/26 12:02:47 33 10.7 N 115 35.9 W  0.0    4 km ( 2 mi) ENE  of Obsidian Butte, CA
11992191  2.2  2001/09/26 12:02:53 33 12.4 N 115 36.0 W  7.0    5 km ( 3 mi) NE   of Obsidian Butte, CA
 9709145  2.6  2001/09/26 12:07:42 33 11.8 N 115 37.2 W  0.7    3 km ( 2 mi) NNE  of Obsidian Butte, CA
11992179  2.3  2001/09/26 12:08:49 33 11.2 N 115 36.2 W  4.5    4 km ( 2 mi) ENE  of Obsidian Butte, CA
 9709149  2.5  2001/09/26 12:12:12 33 11.7 N 115 35.4 W  3.5    5 km ( 3 mi) ENE  of Obsidian Butte, CA
 9709169  2.3  2001/09/26 13:19:18 33 12.0 N 115 36.2 W  4.0    5 km ( 3 mi) NE   of Obsidian Butte, CA
 9709213  2.8  2001/09/26 18:49:07 34  6.7 N 118  6.6 W  9.0    1 km ( 1 mi) SSW  of San Marino, CA
               Felt in San Marino and surrounding communities
 9709273  2.0  2001/09/27 04:27:30 35 20.3 N 118 39.9 W  4.8   21 km (13 mi) NE   of Arvin, CA
 9709285  2.2  2001/09/27 05:30:53 35 20.5 N 118 41.4 W  5.5   20 km (12 mi) NE   of Arvin, CA
 9709293  2.1  2001/09/27 06:27:42 36  4.3 N 117 53.5 W  4.6    6 km ( 4 mi) ENE  of Coso Junction, CA
 9709337  2.8  2001/09/27 12:22:55 32 10.9 N 115 35.6 W  7.0   55 km (34 mi) S    of Calexico, CA
 9709369  2.1  2001/09/27 14:05:24 36  1.7 N 117 45.7 W  2.9   17 km (10 mi) E    of Coso Junction, CA
 9709389  2.2  2001/09/27 16:22:30 34 20.1 N 119  9.7 W 13.6   14 km ( 9 mi) ENE  of Ventura, CA
 9709397  2.2  2001/09/27 16:49:09 36  2.1 N 117 52.8 W  3.1    6 km ( 4 mi) E    of Coso Junction, CA
        -------------------------------------------------------------------------------------------


September 27, 2001

Commentary

Filed under: Old Commentary — kate @ 8:58 am

At 6:49 pm last night, a M2.8 quake was felt in San Marino and
vicinity. The epicenter was located 1 miles southwest of San Marino,
actually about 1 mile north of the San Gabriel Mission, not far
south of the Raymond Hill fault. A short list of towns where the
quake was felt include: San Marino, San Gabriel, South Pasadena,
Alhambra, Pasadena, Rosemead, Arcadia, Temple City, Monterey Park,
Sierra Madre, Glendale, Montebello, and Los Angeles.

September 26, 2001

Commentary

Filed under: Old Commentary — kate @ 7:21 am

At 6:37 am this morning, we had a M2.8 Hector aftershock, located
17 miles north-northwest of Twentynine Palms. Almost none of the
Hector aftershocks smaller than about M3.5 were reported felt, and
this one is probably no exception.

September 25, 2001

Commentary

Filed under: Old Commentary — kate @ 12:00 pm

There has also been a M3.0 quake 12 miles northeast of Olancha
(southern Owens Valley), at 11:34 am today. As with the Coso quake
earlier this morning, we have received no “felt” reports.

Commentary

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

There was a small quake in the Rose Valley area, 3 miles northeast of
Coso Junction, early (4:35 am) this morning. The magnitude was M3.0.
As is usual for quakes in this area, we have no “felt” reports.

September 24, 2001

Commentary

Filed under: Old Commentary — kate @ 2:35 pm

The Anza quake yesterday afternoon was felt in Hemet.

Another small quake has been felt in Orange County this morning. Its
magnitude was M2.3, and it occurred at 8:17 am this morning, 3 miles
north of Orange. It was felt slightly in Orange, Fullerton, Anaheim, Anaheim
hills, and Placentia.

Commentary

Filed under: Old Commentary — kate @ 7:39 am

On Sunday afternoon, at 3:44 pm, there was a M3.0 quake in the San
Jacinto fault zone 9 miles east-southeast of Anza. It could possibly
have been felt, but we don’t have any reports as yet.

September 21, 2001

Commentary

Filed under: Weekly — kate @ 12:00 am



Southern California Earthquakes in the Past Week


Kate Hutton ,

Seismological Laboratory
Lucy Jones,

U. S. Geological Survey
California Institute of Technology

September 21, 2001

The time period covered is 5 pm on Thursday, September 13 (PDT)
through 5 pm on Thursday, September 20 (PDT). During this period
we dectected and analysed 242 earthquakes. Click
here to see a map.

The table below lists the quakes during the past week
that were M2.5 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
      -------------------------------------------------------------------------------------------
 9706217  2.1  2001/09/13 20:51:32 35 31.5 N 118 26.5 W  5.1   13 km ( 8 mi) S    of town of Lake Isabella, CA
 9706441  2.4  2001/09/14 13:24:43 33  9.5 N 115 36.5 W  3.7    3 km ( 2 mi) ESE  of Obsidian Butte, CA
 9706445  2.3  2001/09/14 13:26:27 33  9.6 N 115 37.5 W  4.1    2 km ( 1 mi) SE   of Obsidian Butte, CA
 9706449  2.1  2001/09/14 13:31:26 33  9.9 N 115 36.3 W  3.3    3 km ( 2 mi) ESE  of Obsidian Butte, CA
 9706473  2.1  2001/09/14 14:29:58 34 56.6 N 116 47.3 W  5.6   22 km (14 mi) ENE  of Barstow, CA
 9706513  2.3  2001/09/14 19:46:27 33 27.4 N 116 37.7 W  9.7   12 km ( 7 mi) SSE  of Anza, CA
 9706525  2.7  2001/09/14 20:57:46 33 33.7 N 117  3.4 W 13.0   22 km (14 mi) SSW  of Hemet, CA
 9706617  2.2  2001/09/15 09:59:49 36  1.8 N 117 49.2 W  1.1   12 km ( 7 mi) E    of Coso Junction, CA
 9706633  2.4  2001/09/15 11:48:51 32 54.0 N 115 32.0 W 15.3    7 km ( 4 mi) S    of Brawley, CA
 9706677  2.0  2001/09/15 15:41:50 36  0.8 N 117 53.3 W  6.0    6 km ( 4 mi) SE   of Coso Junction, CA
 9706717  2.2  2001/09/15 20:53:10 34 22.3 N 119 55.1 W  6.2    8 km ( 5 mi) SW   of Isla Vista, CA
 9706721  2.2  2001/09/15 20:54:45 34 26.8 N 119 52.8 W  0.7    4 km ( 3 mi) NNW  of Isla Vista, CA
 9706725  2.2  2001/09/15 21:45:18 32 29.7 N 116 54.2 W  8.3   15 km ( 9 mi) ESE  of San Ysidro, CA
 9706729  2.0  2001/09/15 21:53:30 32 29.6 N 116 54.5 W  8.3   14 km ( 9 mi) ESE  of San Ysidro, CA
 9706801  1.9  2001/09/16 03:38:04 32 55.1 N 115 31.9 W 15.9    5 km ( 3 mi) S    of Brawley, CA
 9706853  2.3  2001/09/16 11:30:19 33 12.9 N 116  4.6 W  9.2   10 km ( 6 mi) NNE  of Ocotillo Wells, CA
 9706865  2.1  2001/09/16 12:50:44 36  4.5 N 117 49.9 W  4.6   11 km ( 7 mi) ENE  of Coso Junction, CA
 9706897  3.1  2001/09/16 18:14:49 33 55.3 N 117 46.4 W 11.8    5 km ( 3 mi) NE   of Yorba Linda, CA
               Felt in Puente/Chino Hills areas
 9706945  2.0  2001/09/17 03:32:56 34 50.4 N 118 57.8 W 13.9    3 km ( 2 mi) NW   of Frazier Park, CA
 9707045  2.0  2001/09/17 13:30:31 34 49.6 N 118 58.2 W 15.7    2 km ( 2 mi) WNW  of Frazier Park, CA
 9707157  2.1  2001/09/18 05:32:10 34  1.8 N 117 14.7 W 16.9    2 km ( 1 mi) SSE  of Loma Linda, CA
 9707189  2.0  2001/09/18 07:51:47 32 30.0 N 116 54.0 W 10.1   15 km ( 9 mi) ESE  of San Ysidro, CA
 9707229  2.1  2001/09/18 11:47:00 36 27.2 N 116 58.2 W  6.5   11 km ( 7 mi) W    of Furnace Creek, CA
 9707285  2.0  2001/09/18 18:07:30 33 60.0 N 118 54.3 W  5.1    6 km ( 4 mi) SSE  of Leo Carrillo State Beach, CA
 9707293  2.2  2001/09/18 18:58:07 34 47.9 N 116 15.7 W  5.8   55 km (34 mi) SSW  of Baker, CA
 9707297  2.4  2001/09/18 19:51:23 33 13.6 N 116  2.6 W 11.7    9 km ( 6 mi) SW   of Salton City, CA
 9707473  2.3  2001/09/19 20:02:03 34 18.6 N 116 51.0 W  6.9    5 km ( 3 mi) N    of Big Bear City, CA
 9707493  1.9  2001/09/19 21:34:24 34 18.5 N 116 51.1 W  6.0    5 km ( 3 mi) N    of Big Bear City, CA
 9707521  2.1  2001/09/20 00:59:48 33 25.7 N 116 24.3 W 12.7   20 km (12 mi) N    of Borrego Springs, CA
 9707561  2.0  2001/09/20 04:33:15 35 19.8 N 118 39.2 W  2.5   21 km (13 mi) NE   of Arvin, CA
 9707609  2.0  2001/09/20 09:01:33 34 31.5 N 116 16.9 W  5.3   43 km (27 mi) N    of Joshua Tree, CA
 9707629  2.9  2001/09/20 10:15:19 36  1.9 N 117 52.7 W  3.6    6 km ( 4 mi) ESE  of Coso Junction, CA
 9707757  3.2  2001/09/20 16:43:23 32 55.5 N 117 46.2 W  7.0   47 km (29 mi) SW   of Oceanside, CA
        -------------------------------------------------------------------------------------------



—————————–218581408531080–

September 20, 2001

Commentary

Filed under: Old Commentary — kate @ 4:54 pm

There has been a small quake, M3.1, located offshore 28 miles
southwest of Oceanside. The time was 4:43 pm. Because of the
location, it was probably not felt.

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