SCSN Earthquake Commentary

October 31, 2002

Commentary

Filed under: Old Commentary — kate @ 4:36 pm

About 23 seconds before the cutoff time for the Weekly Summary, there was a ML3.1 quake in the Hemet area: 15 miles south of Hemet or 13 miles north-northwest of Palomar Observatory. It was felt in the Hemet, Menifee, Winchester & Temecula areas, with a peak intensity of Modified Mercalli III.

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

November 1, 2002

The time period covered is 5 pm on Thursday, October 24 (PDT)

through 4 pm on Thursday, October 31 (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

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

 9853705  2.4  2002/10/24 19:38:08 32  9.5 N 115 47.2 W  7.0   63 km (39 mi) SSW  of Calexico, CA
 9853717  2.1  2002/10/24 20:23:41 33 41.5 N 116 48.8 W 17.2   11 km ( 7 mi) WSW  of Idyllwild, CA
 9853737  2.2  2002/10/25 01:39:56 33 30.3 N 116 34.8 W 14.2   10 km ( 6 mi) ESE  of Anza, CA
 9853757  2.1  2002/10/25 05:07:29 34 51.9 N 116 23.6 W  3.8   53 km (33 mi) SSW  of Baker, CA
 9853773  2.0  2002/10/25 06:44:58 36  0.4 N 117 53.2 W  4.0    7 km ( 4 mi) SE   of Coso Junction, CA
 9853841  2.0  2002/10/25 11:34:40 34 34.4 N 116 16.1 W  5.0   49 km (30 mi) N    of Joshua Tree, CA
 9853845  2.9  2002/10/25 11:37:44 34 19.1 N 117  8.7 W  5.2    9 km ( 5 mi) NNE  of Lake Arrowhead, CA
               FELT in San Bernardino.
 9853961  2.0  2002/10/25 19:00:58 34 40.9 N 116 19.1 W  3.2   61 km (38 mi) N    of Joshua Tree, CA
 9854125  2.1  2002/10/26 20:49:24 34 51.5 N 118 53.9 W 12.8    6 km ( 4 mi) NE   of Frazier Park, CA
 9854341  2.0  2002/10/27 23:32:33 33 40.6 N 116 47.3 W 17.1   10 km ( 6 mi) SW   of Idyllwild, CA
 9854353  2.1  2002/10/28 02:49:32 33  2.1 N 116 34.0 W 14.3    6 km ( 4 mi) SSE  of Julian, CA
 9854381  2.0  2002/10/28 07:11:48 33 42.4 N 116 46.0 W 16.8    7 km ( 4 mi) SW   of Idyllwild, CA
 9854557  2.8  2002/10/29 02:58:01 33 20.7 N 116 21.5 W 13.7   10 km ( 6 mi) N    of Borrego Springs, CA
 9854597  4.8  2002/10/29 06:16:54 34 48.2 N 116 16.0 W  4.6   54 km (34 mi) SSW  of Baker, CA
               FELT in the High Desert.  Peak intensity MM IV in Newberry Springs, Barstow.
 9854617  2.1  2002/10/29 06:37:40 34 48.1 N 116 15.8 W  6.6   54 km (34 mi) SSW  of Baker, CA
 9854621  2.7  2002/10/29 06:42:51 33 25.6 N 117  1.6 W 13.7   17 km (11 mi) WNW  of Palomar Observatory, CA
 9854637  2.5  2002/10/29 07:01:03 34 48.1 N 116 16.2 W  6.7   55 km (34 mi) SSW  of Baker, CA
 9854645  1.9  2002/10/29 07:05:28 34 48.0 N 116 15.7 W  5.2   54 km (34 mi) SSW  of Baker, CA
 9854677  2.1  2002/10/29 07:40:43 34 48.2 N 116 16.2 W  7.2   54 km (34 mi) SSW  of Baker, CA
 9854681  2.4  2002/10/29 07:50:52 34 48.2 N 116 16.3 W  7.1   55 km (34 mi) SSW  of Baker, CA
 9854705  2.0  2002/10/29 08:16:28 34 48.0 N 116 15.8 W  7.8   55 km (34 mi) SSW  of Baker, CA
 9854713  2.4  2002/10/29 08:18:48 34 48.0 N 116 15.9 W  7.9   55 km (34 mi) SSW  of Baker, CA
 9854709  2.2  2002/10/29 08:18:58 33 46.1 N 118 16.3 W 14.7    7 km ( 4 mi) S    of Carson, CA
 9512386  2.1  2002/10/29 08:18:58 33 47.9 N 118 16.3 W 11.0    4 km ( 2 mi) S    of Carson, CA
 9854753  2.0  2002/10/29 08:55:29 34 48.2 N 116 16.4 W  7.2   54 km (34 mi) SSW  of Baker, CA
 9854809  2.3  2002/10/29 09:49:52 33 58.6 N 116 34.3 W 11.8    7 km ( 4 mi) WNW  of Desert Hot Springs, CA
 9854869  2.6  2002/10/29 11:25:46 34 48.2 N 116 16.4 W  6.9   55 km (34 mi) SSW  of Baker, CA
13895460  2.0  2002/10/29 20:24:15 32 43.9 N 117 22.9 W  7.0   13 km ( 8 mi) WSW  of Mission Beach, CA
13899428  2.0  2002/10/29 22:05:50 34 47.9 N 116 16.1 W  7.6   55 km (34 mi) SSW  of Baker, CA
13899432  2.2  2002/10/29 22:53:29 34 48.3 N 116 15.8 W  5.4   54 km (34 mi) SSW  of Baker, CA
 9855169  2.2  2002/10/30 16:08:31 34 18.1 N 116 53.3 W  8.1    5 km ( 3 mi) NW   of Big Bear City, CA
 9855201  2.4  2002/10/30 17:42:13 33 13.5 N 116  6.0 W 13.4   10 km ( 6 mi) NNE  of Ocotillo Wells, CA
 9855245  2.4  2002/10/30 22:03:30 32 58.1 N 117 43.6 W  7.0   41 km (25 mi) SW   of Oceanside, CA
 9855281  2.6  2002/10/31 06:01:03 34 48.6 N 116 16.0 W  5.8   54 km (33 mi) SSW  of Baker, CA
 9855289  2.7  2002/10/31 06:31:40 32 10.1 N 115 21.4 W  7.0   57 km (35 mi) SSE  of Calexico, CA
 9855369  2.0  2002/10/31 09:48:25 34 23.8 N 116  9.3 W  8.5   30 km (19 mi) NNW  of Twentynine Palms, CA
 9855381  2.1  2002/10/31 10:16:27 34 58.5 N 116 22.8 W  5.6   43 km (27 mi) SW   of Baker, CA
 9855477  3.1  2002/10/31 15:59:37 33 32.0 N 116 56.3 W  5.6   21 km (13 mi) NNW  of Palomar Observatory, CA
               FELT in Hemet, Menifee, Winchester, Temecula area.
        -------------------------------------------------------------------------------------------

October 29, 2002

Commentary

Filed under: Old Commentary — kate @ 10:40 am

A (preliminary) M4.5 aftershock to the Hector Mines earthquake (Mw 7.1, October 16, 1999) occurred this morning at 6:16 am and was felt widely across San Bernardino county; from Baker to Victorville to Twentynine Palms. The aftershock was located 8 miles northwest of Ludlow (or 34 miles south-soutwest of Baker) and occurred in the northern region of the Hector Mines aftershock zone. The focal mechanism showed mostly strike-slip movement along the fault with some slight vertical offset. The last time we had an aftershock of this size was over two years ago in June of 2000. It took place in the same general location as today’s earthquake and was also a M4.5.

October 25, 2002

Commentary

Filed under: Old Commentary — kate @ 1:25 pm

Surprisingly enough there were no inquiries or “felt” reports about the M2.9 earthquake that occurred 5 miles north-northeast of Lake Arrowhead at 11:37 am. This earthquake is about 13 miles west of the M3.6 earthquake that shook Big Bear City Tuesday afternoon.

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

October 25, 2002

The time period covered is 5 pm on Thursday, October 18 (PDT)

through 5 pm on Thursday, October 24 (PDT). During this period

we dectected and analysed 184 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

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

 9851749  3.2  2002/10/17 21:45:42 32 38.0 N 118  4.8 W  7.0   32 km (20 mi) SE   of San Clemente Is.
 9851761  3.0  2002/10/18 01:04:55 34 42.4 N 116 17.7 W  2.3   63 km (39 mi) N    of Joshua Tree, CA
 9852049  2.1  2002/10/19 01:54:46 32 56.9 N 115 31.4 W 16.0    2 km ( 1 mi) SE   of Brawley, CA
 9852053  2.4  2002/10/19 01:56:36 32 16.9 N 115 47.7 W  7.3   51 km (32 mi) SSW  of Calexico, CA
 9852169  2.3  2002/10/19 13:30:08 33 58.6 N 117  8.8 W 15.5    9 km ( 6 mi) SSE  of Redlands, CA
 9852249  2.4  2002/10/20 02:25:34 32 41.1 N 117 56.1 W  7.0   41 km (26 mi) ESE  of San Clemente Is.
 9852257  2.9  2002/10/20 03:50:25 33 51.9 N 119 18.7 W  5.6   27 km (17 mi) SE   of Santa Cruz Is.
 9852281  2.4  2002/10/20 06:20:18 33 51.9 N 119 23.5 W  7.0   22 km (14 mi) SSE  of Santa Cruz Is.
 9852397  2.3  2002/10/20 18:18:49 32 21.3 N 115 14.6 W  7.0   42 km (26 mi) SE   of Calexico, CA
 9852413  2.1  2002/10/20 21:17:33 32 34.7 N 115 46.5 W  4.2   27 km (17 mi) SE   of Ocotillo, CA
 9852637  3.6  2002/10/22 00:15:26 34 18.1 N 116 53.0 W  7.1    5 km ( 3 mi) NW   of Big Bear City, CA
               FELT in Big Bear/Arrowhead area to Victorville, San Bernardion & Riverside
 9852945  2.3  2002/10/23 01:46:43 34  4.0 N 118 52.7 W 14.5    6 km ( 4 mi) ENE  of Leo Carrillo State Beach, CA
 9853053  2.3  2002/10/23 09:53:21 34 17.8 N 116 53.0 W  7.7    4 km ( 3 mi) NW   of Big Bear City, CA
 9853165  2.1  2002/10/23 16:58:54 36 32.3 N 117 59.2 W  4.7   10 km ( 6 mi) SE   of Lone Pine, CA
 9853201  2.5  2002/10/23 20:24:38 36  0.6 N 117 52.5 W  3.5    8 km ( 5 mi) ESE  of Coso Junction, CA
 9853417  3.8  2002/10/24 10:18:32 33 30.3 N 116 34.9 W 14.5   10 km ( 6 mi) ESE  of Anza, CA
               FELT widely in Anza area, Palm Springs/Indio area west to Temecula
 9853421  2.0  2002/10/24 10:21:15 33 31.0 N 116 34.3 W 14.8   10 km ( 6 mi) ESE  of Anza, CA
 9853437  2.3  2002/10/24 10:22:46 33 30.8 N 116 34.1 W 15.0   11 km ( 7 mi) ESE  of Anza, CA
 9853449  2.4  2002/10/24 10:25:16 33 31.0 N 116 34.2 W 14.7   10 km ( 6 mi) ESE  of Anza, CA
 9853453  2.5  2002/10/24 10:25:31 33 30.6 N 116 35.0 W 14.8   10 km ( 6 mi) ESE  of Anza, CA
 9853461  2.0  2002/10/24 10:26:30 33 30.9 N 116 34.4 W 14.8   10 km ( 6 mi) ESE  of Anza, CA
 9853489  2.1  2002/10/24 10:42:01 33 18.9 N 115 40.1 W 11.1    7 km ( 4 mi) ESE  of Bombay Beach, CA
 9512138  2.2  2002/10/24 11:12:14 33  9.1 N 115 57.2 W  9.8   14 km ( 9 mi) S    of Salton City, CA
        -------------------------------------------------------------------------------------------

October 24, 2002

Commentary

Filed under: Old Commentary — kate @ 10:53 am

There has been a M3.6 quake in the Anza area this morning … at 10:18 am. The epicenter was located 6 miles southeast of the town of Anza. It was reported felt in the Anza area, as well as the Palm Springs, Palm Desert, Rancho Mirage areas & as far west as Temecula & Fallbrook. There is a preliminary focal mechanism, indicating strike-slip motion, but not with the same strike as the San Jacinto fault. If correct, this means that some adjacent minor fault would be responsible. Numerous small aftershocks are being recorded.

October 22, 2002

Commentary

Filed under: Old Commentary — kate @ 6:39 am

A M3.4 quake was fairly widely felt in the Big Bear area early this morning (1:34 am). The epicenter was located 3 miles northwest of Big Bear City. The quake was felt in Big Bear City, Big Bear Lake, Fawnskin, Lake Arrowhead, Lucerne Valley & San Bernardino.

October 17, 2002

Commentary

Filed under: Old Commentary — kate @ 10:00 pm

There was another offshore earthquake near San Clemente Island today. It occurred at 9:45 pm. Like its earlier companion (see the October 16 20:38 entry) it had a magnitude of 3.2 and was located 20 miles southeast of the island’s southeast tip.

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

October 17, 2002

The time period covered is 5 pm on Thursday, October 11 (PDT)
through 5 pm on Thursday, October 17 (PDT). During this period
we dectected and analysed 177 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
-------------------------------------------------------------------------------------------
 9849645  2.0  2002/10/11 07:24:26 34 15.1 N 118 31.7 W 15.4    2 km ( 1 mi) NNE  of Northridge, CA
 9849941  2.5  2002/10/11 20:48:31 35 38.2 N 119 34.4 W  7.0   50 km (31 mi) NE   of Simmler, CA
 9849949  2.0  2002/10/11 21:39:32 35 58.7 N 117 52.1 W  3.9   10 km ( 6 mi) SE   of Coso Junction, CA
 9850105  3.0  2002/10/12 08:29:23 33 44.8 N 116  1.5 W  8.8   18 km (11 mi) E    of Indio, CA
 9850373  2.3  2002/10/12 23:48:38 32  4.7 N 115 21.7 W  7.0   67 km (42 mi) S    of Calexico, CA
 9850385  2.0  2002/10/13 01:40:39 32 52.7 N 116 57.2 W 14.0    9 km ( 6 mi) N    of El Cajon, CA
 9850441  2.6  2002/10/13 07:20:10 32 29.4 N 115 24.3 W  7.0   22 km (13 mi) SSE  of Calexico, CA
 9850761  2.9  2002/10/14 04:26:09 33 38.0 N 117 59.4 W 19.0    6 km ( 4 mi) WNW  of Newport Beach, CA
 9850793  2.6  2002/10/14 08:16:33 32 52.8 N 116 15.6 W  7.6   30 km (18 mi) WNW  of Ocotillo, CA
 9850901  2.0  2002/10/14 12:04:58 32 43.1 N 115 25.1 W  3.3    9 km ( 6 mi) NE   of Calexico, CA
 9851093  2.0  2002/10/15 00:22:58 32 24.5 N 115 25.2 W  7.0   30 km (18 mi) SSE  of Calexico, CA
 9851125  2.3  2002/10/15 05:37:31 34 19.0 N 116 27.0 W  7.7   22 km (14 mi) N    of Yucca Valley, CA
 9851193  2.0  2002/10/15 10:58:46 34 39.8 N 116 17.2 W  5.0   59 km (36 mi) N    of Joshua Tree, CA
 9851305  2.5  2002/10/15 20:46:44 32  6.5 N 114 59.3 W  7.0   74 km (46 mi) SSW  of Yuma, AZ
 9851309  2.0  2002/10/15 22:16:57 32  6.3 N 115  3.6 W  7.0   75 km (46 mi) SSE  of Calexico, CA
 9851349  2.0  2002/10/16 02:50:37 34 23.9 N 116  9.4 W  7.1   31 km (19 mi) NNW  of Twentynine Palms, CA
13859884  3.2  2002/10/16 13:21:59 32 37.1 N 118  5.1 W 11.4   33 km (21 mi) SE   of San Clemente Is.
 9851505  3.1  2002/10/16 20:26:34 33 28.9 N 116 30.0 W 14.9   18 km (11 mi) ESE  of Anza, CA
 9851509  2.6  2002/10/16 20:42:06 32 26.5 N 115 24.4 W  7.0   27 km (16 mi) SSE  of Calexico, CA
 9851521  2.0  2002/10/16 22:23:38 32 52.5 N 115 46.6 W  9.8   23 km (14 mi) WNW  of El Centro, CA
 9851585  2.3  2002/10/17 07:19:25 35 21.2 N 117 20.5 W  5.5   41 km (26 mi) W    of Goldstone Lake, CA
-------------------------------------------------------------------------------------------


October 16, 2002

Commentary

Filed under: Old Commentary — kate @ 8:38 pm

Today there were a pair of earthquakes greater than M3.0 though neither of them were reported as being felt. This came as no great surprise since their locations are pretty remote. The first quake, a M3.2, occurred at 1:21pm 20 miles southeast of the (southeast) tip of San Clemente Island. Then tonight at 8:26 pm a M3.1 occurred 11 miles east-southeast of Anza.

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