SCSN Earthquake Commentary

August 28, 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

August 28, 2003

The time period covered is 5 pm on Thursday, August 21, 2003 (PDT)
through 5 pm on Thursday, August 28 (PDT). During this period
we dectected and analysed 197 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
-------------------------------------------------------------------------------------------

13986776  2.5  2003/08/22 07:08:51 32 53.4 N 116 14.9 W  9.8   29 km (18 mi) NW   of Ocotillo, CA
13986796  2.0  2003/08/22 08:11:31 32 57.9 N 115 34.4 W 13.2    4 km ( 2 mi) W    of Brawley, CA
 9940085  2.0  2003/08/22 13:45:23 35  4.5 N 119  5.0 W 25.9   15 km ( 9 mi) WNW  of Wheeler Ridge, CA
 9940433  2.2  2003/08/24 09:58:59 32 15.3 N 115 16.5 W  7.0   50 km (31 mi) SSE  of Calexico, CA
 9940565  3.2  2003/08/25 00:31:10 34 23.7 N 118 39.0 W 17.3    8 km ( 5 mi) W    of Valencia, CA
 FELT IN NORTHERN LOS ANGELES COUNTY
 9940601  2.2  2003/08/25 02:22:41 33 55.9 N 116 47.4 W 12.4    1 km ( 1 mi) NNW  of Cabazon, CA
 9940605  2.7  2003/08/25 02:30:22 33 39.6 N 118  1.7 W 18.3    3 km ( 2 mi) SSE  of Bolsa Chica Beach, CA
 FELT IN ORANGE COUNTY
 9940641  2.1  2003/08/25 08:10:15 33 53.4 N 117 55.3 W 14.7    2 km ( 1 mi) N    of Fullerton, CA
 9940681  2.6  2003/08/25 12:56:48 36  5.2 N 117 53.6 W  1.8    7 km ( 4 mi) NE   of Coso Junction, CA
 9940725  2.0  2003/08/25 14:29:14 34 23.5 N 118 38.9 W 17.2    8 km ( 5 mi) W    of Valencia, CA
 9940821  2.4  2003/08/25 19:43:00 33 56.6 N 116 44.8 W 18.8    4 km ( 3 mi) NE   of Cabazon, CA
 9941077  2.6  2003/08/26 23:00:59 34 24.0 N 118 39.1 W 19.0    8 km ( 5 mi) W    of Valencia, CA
 FELT IN VALENCIA
 9941081  3.9  2003/08/26 23:02:22 34 24.3 N 118 38.9 W 17.9    8 km ( 5 mi) W    of Valencia, CA
 FELT IN NORTHERN LOS ANGELES COUNTY, VENTURA,AND SANTA BARBARA
 9941085  2.4  2003/08/26 23:03:50 34 23.9 N 118 39.7 W 18.4    9 km ( 6 mi) W    of Valencia, CA
 9941109  2.2  2003/08/26 23:28:20 33 38.8 N 116 46.7 W 15.1   12 km ( 8 mi) SSW  of Idyllwild, CA
 9941145  2.4  2003/08/27 01:50:07 35 37.6 N 119 30.6 W  7.0   54 km (33 mi) NE   of Simmler, CA
 9941177  2.0  2003/08/27 09:07:48 33 35.1 N 116 49.4 W 13.7   14 km ( 9 mi) WNW  of Anza, CA  

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


August 27, 2003

Commentary

Filed under: Old Commentary — kate @ 7:38 am

There were more “felt” quakes in the Valencia area late last night. The largest was a M3.9 at 11:02 pm, located 5 miles west of Valencia. It was widely felt from Frazier Park (top of the Grapevine) to Santa Monica & Pasadena. Peak intensity was Modified Mecalli IV. There was a M2.6 foreshock at 11:01 pm & a M2.4 aftershock at just shy of 11:04 pm, both of which might have been felt in the immediate Valencia area. This epicenter is the same as that of the M3.2 on Monday.

August 25, 2003

Commentary

Filed under: Old Commentary — kate @ 9:52 am

A M3.2 at 12:31 am this morning was fairly widely felt in the San Fernando Valley & as far north as Castaic. The epicenter was located 5 miles west of Valencia.

There also was a M2.7 quake near Bolsa Chica that was fetl in the Orange County area. It occurred at 2:30 am & was located 2 miles south-southeast of Bolsa Chica Beach.

August 21, 2003

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

August 21, 2003

The time period covered is 5 pm on Thursday, August 14 (PDT)
through 5 pm on Thursday, August 21 (PDT). During this period
we dectected and analysed 201 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
    -------------------------------------------------------------------------------------------
13985096  2.4  2003/08/15 07:57:32 33 30.6 N 116 27.9 W  6.5   20 km (12 mi) ESE  of Anza, CA
13985192  2.0  2003/08/15 13:26:07 32 38.1 N 115 52.4 W  8.1   16 km (10 mi) SE   of Ocotillo, CA
13985204  2.5  2003/08/15 14:21:36 34 30.4 N 116 30.6 W  4.1   40 km (25 mi) E    of Lucerne Valley, CA
13985264  2.8  2003/08/15 19:53:43 34 15.7 N 117 34.0 W  5.0    8 km ( 5 mi) ESE  of Mt. Baldy, CA
13985312  2.5  2003/08/16 03:43:31 33 59.9 N 117 11.3 W 12.2    6 km ( 4 mi) S    of Redlands, CA
13985380  2.0  2003/08/16 08:14:38 32  4.9 N 116 18.4 W  6.0   78 km (49 mi) SSW  of Ocotillo, CA
13985432  2.1  2003/08/16 12:06:54 33 11.0 N 115 35.9 W  3.5    4 km ( 2 mi) ENE  of Obsidian Butte, CA
13985584  2.2  2003/08/17 06:21:47 33 59.1 N 118 47.3 W 13.4    2 km ( 1 mi) SE   of Pt. Dume, CA
13985924  2.6  2003/08/18 20:03:05 35  2.0 N 117  6.5 W  5.1   18 km (11 mi) NNW  of Barstow, CA
13986068  3.0  2003/08/19 13:07:57 32 43.4 N 116  1.2 W 14.7    3 km ( 2 mi) WSW  of Ocotillo, CA
13986088  2.3  2003/08/19 13:48:32 34 20.5 N 117 37.5 W  9.8    2 km ( 1 mi) S    of Wrightwood, CA
13986104  3.7  2003/08/19 15:02:08 36 27.9 N 118 17.4 W  9.5   13 km ( 8 mi) S    of Mt. Whitney, CA
13986108  2.1  2003/08/19 15:06:33 36 28.3 N 118 17.2 W 11.8   12 km ( 7 mi) S    of Mt. Whitney, CA
13986112  2.3  2003/08/19 15:09:38 36 28.0 N 118 17.5 W  5.5   13 km ( 8 mi) S    of Mt. Whitney, CA
13986164  2.2  2003/08/19 17:31:47 33 15.4 N 116 18.4 W 13.3    6 km ( 4 mi) E    of Borrego Springs, CA
13986236  2.1  2003/08/20 03:51:48 32 17.2 N 116 22.9 W  7.0   62 km (38 mi) SW   of Ocotillo, CA
13986248  2.1  2003/08/20 06:57:44 34 18.3 N 116 50.1 W  6.5    5 km ( 3 mi) NNE  of Big Bear City, CA


August 19, 2003

Commentary

Filed under: Old Commentary — kate @ 3:29 pm

We just had another small one in a different “isolated area”. There was a M3.6 near Mt. Whitney, in the Sierras, 16 miles southwest of Lone Pine. So far, we have reports that it was felt in Porterville, Three Rivers, Lone Pind & Yosemite National Park.

Commentary

Filed under: Old Commentary — kate @ 2:25 pm

There was a M3.0 quake early this afternoon, at 1:07 pm, 2 miles west-southwest of Ocotillo. We don’t have any felt reports yet, but it probably was felt in Ocotillo, judging from the size. This epicenter is close to the Elsinore fault.

August 18, 2003

Commentary

Filed under: Old Commentary — kate @ 9:07 am

Two small quakes were felt over the weekend. The first was a M2.8 at 7:53 pm Friday night. This quake occurred 5 miles east-southeast of Mt. Baldy & was reported felt in Wrightwood & Lytle Creek.

The other one was a M2.5 at 3:43 am, 4 miles south of Redlands. It was felt in Moreno Valley.

August 14, 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

August 14, 2003

The time period covered is 5 pm on Thursday, August 7, 2003 (PDT)
through 5 pm on Thursday, August 14 (PDT). During this period
we dectected and analysed 180 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
-------------------------------------------------------------------------------------------

 9936525  3.0  2003/08/07 21:55:04 33 23.4 N 118 39.9 W  2.8   32 km (20 mi) W    of Avalon Catalina Island, CA
FELT ON CATALINA ISLAND
 9936797  2.3  2003/08/08 21:03:06 33 22.6 N 116 24.9 W 13.2   14 km ( 9 mi) NNW  of Borrego Springs, CA
 9936817  2.5  2003/08/08 23:38:20 33 22.5 N 116 55.9 W 13.9    7 km ( 4 mi) WNW  of Palomar Observatory, CA
 9936925  2.3  2003/08/09 10:47:51 34 33.3 N 116 15.2 W  5.6   47 km (29 mi) N    of Joshua Tree, CA
 9936941  2.2  2003/08/09 12:06:53 34 39.5 N 116 18.0 W  5.6   58 km (36 mi) N    of Joshua Tree, CA
 9937013  2.1  2003/08/09 21:33:54 34 18.2 N 116 27.2 W  6.3   20 km (13 mi) N    of Yucca Valley, CA
 9937221  2.5  2003/08/11 06:15:42 32  4.1 N 116 17.5 W  7.0   79 km (49 mi) SSW  of Ocotillo, CA
13984284  2.3  2003/08/11 23:44:08 33 10.1 N 115 39.0 W  3.3    1 km ( 1 mi) W    of Obsidian Butte, CA
13984428  2.0  2003/08/12 15:36:16 36  6.7 N 117 47.1 W  5.3   16 km (10 mi) ENE  of Coso Junction, CA
13984452  2.4  2003/08/12 17:35:59 32 45.8 N 115 26.2 W 21.1   11 km ( 7 mi) ESE  of El Centro, CA
13984504  2.2  2003/08/12 23:45:40 32 46.8 N 115 26.7 W 13.6   10 km ( 6 mi) E    of El Centro, CA
13984512  2.4  2003/08/13 00:40:06 32 47.3 N 115 26.5 W 14.1   10 km ( 6 mi) E    of El Centro, CA
13984548  2.2  2003/08/13 04:11:23 33 38.3 N 116 43.7 W 18.6   11 km ( 7 mi) NNW  of Anza, CA
13984552  2.2  2003/08/13 04:15:26 33 55.6 N 117 46.8 W 11.6    5 km ( 3 mi) NE   of Yorba Linda, CA
13984568  2.2  2003/08/13 07:12:39 32 53.2 N 116 14.7 W  9.2   29 km (18 mi) NW   of Ocotillo, CA
13984608  2.1  2003/08/13 09:16:27 33 55.1 N 117 47.7 W 11.9    4 km ( 2 mi) NNE  of Yorba Linda, CA
13984940  2.4  2003/08/14 13:38:56 34  1.8 N 117 33.8 W  8.4    9 km ( 6 mi) ESE  of Ontario, CA
FELT IN ONTARIO

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


August 8, 2003

Commentary

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

At 9:55 pm last night, there was a M3.0 offshore, 20 miles west of Avalon, Catalina Is. Although the quake was probably felt on Catalina Is., we have no reports so far.

August 7, 2003

Commentary

Filed under: Old Commentary — kate @ 8:07 am

There was a M2.9 quake at 10:48 pm last night, located 16 miles east of Barstow. As far as we know, it was not felt. This quake might or might not (statistically speaking) be a Landers aftershock. The epicenter is in a detached (from the main fault) group of such aftershocks & the aftershock sequence in general can still be easily seen on the seismicity maps. However, that particular region has been inactive for quite awhile.

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