SCSN Earthquake Commentary

October 31, 2003

Commentary

Filed under: Old Commentary — kate @ 7:20 am

Yesterday at 5:07 pm, there was a M2.9 quake located 3 miles northwest of Malibu. This quake was originally reported as a M3.0; actually the final result was M2.94, so a slight increase in the number of readings used for the magnitude got it rounded down instead of up. Whatever the magnitude, the quake was felt in the Calabasas, Agoura Hills areas, Westlake Village, Thousand Oaks & nearby communities. The peak intensity was Modified Mercally III.

October 30, 2003

Commentary

Filed under: Old Commentary — kate @ 7:51 am

There was another in Simi Valley at 5:50 am this morning, a magnitude M2.6. It occurred about 1 mile north-northwest of Simi Valley & was felt in Simi Valley. There have been 6 quakes in this series, the largest one of course being the M3.6 yesterday.

We also saw a M2.7 this morning, under the southeastern end of the Salton Sea, 3 miles north-northeast of Obsidian Butte. This area is part of the Brawley Seismic Zone, which is a common source of small earthquakes. The time on today’s quake was 7:03 am.

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

October 30, 2003

The time period covered is 5 pm on Thursday, October 23, 2003 (PDT)
through 4 pm on Thursday, October 30 (PST). During this period
we dectected and analysed 153 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. PDT Date   PDT Time  Lat.       Long.    Depth  Descriptive location
-------------------------------------------------------------------------------------------

 #EVID     MAG  YYYY/MM/DD HH:mm:SS LAT       LON        DEP     LOCATION
13999224  2.0  2003/10/23 22:46:21 33 44.4 N 119  2.8 W  7.0   30 km (19 mi) N    of Santa Barbara Is., CA
13999236  2.0  2003/10/24 01:40:58 34 58.8 N 116 56.3 W  4.5   13 km ( 8 mi) NE   of Barstow, CA
13999244  3.1  2003/10/24 03:11:05 33  3.6 N 115 54.5 W  3.0   23 km (14 mi) ESE  of Ocotillo Wells, CA
POSSIBLY FELT IN OCOTILLO WELLS AND SALTON CITY
13999260  2.5  2003/10/24 05:21:38 32 12.4 N 115 26.5 W  7.0   52 km (32 mi) S    of Calexico, CA
13999440  2.0  2003/10/24 21:48:09 32 14.1 N 115 24.9 W  7.0   49 km (30 mi) S    of Calexico, CA
13999448  3.4  2003/10/24 22:49:52 32 11.6 N 115 25.2 W  7.0   53 km (33 mi) S    of Calexico, CA
13999516  2.5  2003/10/25 08:24:01 34 17.4 N 116 49.6 W  4.4    4 km ( 2 mi) NE   of Big Bear City, CA
13999552  2.1  2003/10/25 11:00:11 34  2.2 N 118 28.7 W 12.6    2 km ( 1 mi) NNE  of Santa Monica, CA
13999628  2.1  2003/10/25 15:24:34 32 12.5 N 115 26.9 W  6.0   51 km (32 mi) S    of Calexico, CA
13999696  2.3  2003/10/26 00:52:09 34 16.5 N 116 24.5 W  1.6   18 km (11 mi) NNW  of Joshua Tree, CA
13999700  2.0  2003/10/26 01:36:17 32 47.6 N 115 27.0 W 11.8   10 km ( 6 mi) E    of El Centro, CA
14000224  3.0  2003/10/28 23:18:30 34 39.5 N 116 17.7 W  4.5   58 km (36 mi) N    of Joshua Tree, CA
14000284  2.8  2003/10/29 08:36:19 34 16.4 N 118 44.3 W 10.0    3 km ( 2 mi) W    of Simi Valley, CA
FELT IN SIMI VALLEY AND THOUSAND OAKS
14000368  2.5  2003/10/29 15:14:51 32  2.7 N 116 18.5 W  6.0   82 km (51 mi) SSW  of Ocotillo, CA
14000376  3.6  2003/10/29 15:44:48 34 16.3 N 118 45.2 W 13.8    4 km ( 3 mi) W    of Simi Valley, CA
FELT WIDELY IN LOS ANGELES AND VENTURA COUNTIES (1428 FELT REPORTS)
14000388  2.2  2003/10/29 19:41:21 34 16.4 N 118 44.1 W 12.7    3 km ( 2 mi) WSW  of Simi Valley, CA
14000396  2.4  2003/10/29 22:48:59 32  9.3 N 115 26.6 W  7.0   57 km (36 mi) S    of Calexico, CA
14000432  2.6  2003/10/30 05:50:39 34 16.8 N 118 44.5 W 10.6    3 km ( 2 mi) W    of Simi Valley, CA
FELT IN SIMI VALLEY
14000436  2.7  2003/10/30 07:03:25 33 12.7 N 115 36.6 W  4.2    5 km ( 3 mi) NNE  of Obsidian Butte, CA
14000480  2.0  2003/10/30 08:33:47 33 54.4 N 118 42.6 W 18.1   14 km ( 8 mi) SE   of Pt. Dume, CA
14000536  2.0  2003/10/30 15:13:33 33 42.7 N 116 46.2 W 16.8    6 km ( 4 mi) SW   of Idyllwild, CA  

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


October 29, 2003

Commentary

Filed under: Old Commentary — kate @ 4:18 pm

At 3:44 pm today, there was a M3.7 about 1 mile north of Simi Valley, in the same location where the earlier quakes occurred today. There have been more than 900 (and growing) “felt reports” on the CIIM website (”Did You Feel It?” link above), indicating a peak intensity of Modified Mercalli IV in Simi Valley. The quake was felt as far away as Pasadena, the Santa Monica area & Castaic.

Commentary

Filed under: Old Commentary — kate @ 10:29 am

We had another small quake this morning: a M2.8 under Simi Valley. It was felt in the Simi Valley & Thousand Oaks area. The time was 8:36 am this morning. Between the Hector Mines quake last night & this one, we are getting a pretty good survey of which of our seismic stations are still working.

Commentary

Filed under: Old Commentary — kate @ 8:28 am

There was a M3.0 Hector Mines quake at 11:18 pm last night. The epicenter was located 9 miles west-southwest of Ludlow. The quake was probably not felt, due to its remote location.

October 24, 2003

Commentary

Filed under: Old Commentary — kate @ 9:19 am

There was a M3.1 early this morning near Ocotillo Wells, west of the Imperial Valley. The time was 3:11 am & the epicenter was located in the complex San Jacinto fault zone 14 miles east-southeast of Ocotillo Wells. The ShakeMap indicates that the peak instrumental intensity should have been about Modified Mercalli III near the southwestern shore of the Salton Sea, but we have not received any actual “felt reports” yet.

October 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

October 23, 2003

The time period covered is 5 pm on Thursday, October 16, 2003 (PDT)
through 5 pm on Thursday, October 23 (PDT). During this period
we dectected and analysed 202 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. PDT Date   PDT Time  Lat.       Long.    Depth  Descriptive location
-------------------------------------------------------------------------------------------

#EVID     MAG  YYYY/MM/DD HH:mm:SS LAT       LON        DEP     LOCATION
13997900  2.3  2003/10/17 02:53:03 33 50.4 N 118 50.7 W  0.6   18 km (11 mi) SSW  of Pt. Dume, CA
13998056  2.2  2003/10/17 20:27:05 35 37.1 N 117 21.8 W 11.5   17 km (10 mi) S    of Trona, CA
13998096  3.2  2003/10/18 00:27:19 35 13.2 N 120 47.7 W  0.1   14 km ( 9 mi) WSW  of San Luis Obispo, CA
FELT IN SAN LUIS OBISPO, SANTA MARIA, AND LOMPOC
13998100  3.0  2003/10/18 00:39:00 35 13.4 N 120 47.6 W  0.0   14 km ( 9 mi) WSW  of San Luis Obispo, CA
FELT IN SAN LUIS OBISPO, SANTA MARIA, AND LOMPOC
13998116  2.0  2003/10/18 02:49:16 33  9.1 N 115 39.2 W  3.9    3 km ( 2 mi) SW   of Obsidian Butte, CA
13998156  2.7  2003/10/18 07:13:25 36  1.6 N 117 47.2 W  2.8   15 km ( 9 mi) E    of Coso Junction, CA
13998180  2.9  2003/10/18 08:42:40 32 10.0 N 115 26.4 W  7.0   56 km (35 mi) S    of Calexico, CA
13998184  2.0  2003/10/18 09:01:46 34  4.9 N 116 45.2 W  9.8    7 km ( 4 mi) ESE  of Mt. San Gorgonio, CA
13998344  2.0  2003/10/19 07:44:02 34 40.8 N 116 17.9 W  5.3   60 km (38 mi) N    of Joshua Tree, CA
13998368  2.2  2003/10/19 10:03:01 32 12.1 N 115 26.7 W  7.9   52 km (32 mi) S    of Calexico, CA
13998372  2.1  2003/10/19 10:26:11 32 13.5 N 115 26.1 W  7.0   50 km (31 mi) S    of Calexico, CA
13998468  2.4  2003/10/20 09:13:26 32 13.0 N 115 26.5 W  7.0   50 km (31 mi) S    of Calexico, CA
13998500  2.1  2003/10/20 13:03:42 36  5.5 N 118 15.9 W 10.3   29 km (18 mi) W    of Coso Junction, CA
13998520  3.2  2003/10/20 13:53:51 32  9.2 N 115 25.7 W  7.0   58 km (36 mi) S    of Calexico, CA
13998588  2.0  2003/10/20 19:45:43 32 12.3 N 115 25.4 W  7.0   52 km (32 mi) S    of Calexico, CA
13998596  2.0  2003/10/20 21:20:13 34 58.8 N 119  9.3 W 18.8   19 km (12 mi) W    of Wheeler Ridge, CA
13998640  2.2  2003/10/21 04:42:30 36  5.6 N 118 15.9 W 11.9   29 km (18 mi) W    of Coso Junction, CA
13998652  2.1  2003/10/21 05:08:04 32 11.6 N 115 26.6 W  7.0   53 km (33 mi) S    of Calexico, CA
13998676  2.2  2003/10/21 06:43:38 35 13.8 N 120 46.5 W 11.9   12 km ( 8 mi) WSW  of San Luis Obispo, CA
13998708  2.3  2003/10/21 11:57:31 36  5.5 N 118 15.5 W 10.9   28 km (18 mi) W    of Coso Junction, CA
13998768  3.6  2003/10/21 17:04:03 32 20.1 N 115 15.1 W 28.9   44 km (27 mi) SSE  of Calexico, CA
FELT IN EL CENTRO  

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


October 22, 2003

Commentary

Filed under: Old Commentary — kate @ 3:17 pm

There was a M3.5 quake in northern Baja late yesterday afternoon. It was located 27 miles south-southeast of Calexico & took place at 5:04 pm. The quake was felt in El Centro.

October 20, 2003

Commentary

Filed under: Old Commentary — kate @ 7:53 am

Very early Saturday morning (12:27 am & 12:38 am), there was a pair of M3.4’s in the Pismo Beach/San Luis Obispo area. The epicenters were located 10 miles southwest of San Luis Obispo. The quakes were reported felt in the San Luis Obispo area, Santa Maria & Lompoc.

We also had a M2.7 9 miles east of Coso Junction on Saturday morning. The time was 7:13 am. It was accompanied by about half a dozen smaller quakes, all in the M1 range.

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