SCSN Earthquake Commentary

March 30, 2002

Commentary

Filed under: Old Commentary — kate @ 9:20 am

A quake was fairly widely felt from San Diego to Riverside, Palm Springs and
Indio, at about 5:50 am this morning. The magnitude was M3.8, and
the epicenter was located 2 miles northeast of Mesa Grande,
probably associated with the Elsinore fault zone. The peak intensity
was MMI V, in the Julian, Santa Ysabel, and Mesa Grande areas.

March 29, 2002

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

March 29, 2002

The time period covered is 4 pm on Thursday, March 21 (PST)
through 4 pm on Thursday, March 28 (PST). During this period
we dectected and analysed 187 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
        -------------------------------------------------------------------------------------------
 9772789  2.5  2002/03/21 22:55:11 33 58.0 N 117 44.1 W 13.0    7 km ( 4 mi) SW   of Chino, CA
               FELT in Chino Hills, Corona
 9772861  2.9  2002/03/22 13:15:03 33 38.6 N 119 18.1 W  7.0   29 km (18 mi) NW   of Santa Barbara Is., CA
 9772873  2.4  2002/03/22 14:01:10 32 43.3 N 115 31.0 W 17.1    6 km ( 4 mi) NNW  of Calexico, CA
               FELT in El Centro
 9772897  2.9  2002/03/22 15:37:53 35 46.8 N 118  2.6 W  6.8   31 km (19 mi) SSW  of Coso Junction, CA
 9772973  3.4  2002/03/23 04:27:32 34 16.0 N 116 46.5 W  3.0    7 km ( 5 mi) E    of Big Bear City, CA
               FELT in Big Bear area, San Bernardino, Riverside
 9772977  2.0  2002/03/23 04:29:08 34 16.1 N 116 46.0 W  5.5    8 km ( 5 mi) E    of Big Bear City, CA
 9773069  2.6  2002/03/23 19:00:05 32 24.8 N 115  6.6 W  7.0   46 km (29 mi) SE   of Calexico, CA
 9773073  2.0  2002/03/23 19:03:13 32 24.4 N 115  6.2 W  7.0   47 km (29 mi) SE   of Calexico, CA
 9773081  2.7  2002/03/23 19:48:19 32 19.3 N 115 18.3 W  7.0   42 km (26 mi) SSE  of Calexico, CA
 9773085  2.5  2002/03/23 19:59:52 32 21.4 N 115 10.2 W  7.0   46 km (29 mi) SE   of Calexico, CA
 9773121  2.1  2002/03/24 00:11:47 32 18.2 N 115 19.1 W  6.9   44 km (27 mi) SSE  of Calexico, CA
 9773189  2.3  2002/03/24 11:41:54 34 21.6 N 118 40.5 W 14.7   10 km ( 6 mi) NNE  of Simi Valley, CA
 9773197  2.3  2002/03/24 12:10:43 32 19.7 N 115 18.9 W  7.0   41 km (26 mi) SSE  of Calexico, CA
 9773261  2.2  2002/03/25 02:11:27 32 13.1 N 115 19.8 W  7.0   52 km (33 mi) SSE  of Calexico, CA
 9773269  2.8  2002/03/25 03:25:12 34 46.7 N 116 23.3 W 11.0   59 km (37 mi) ESE  of Barstow, CA
 9773277  2.6  2002/03/25 04:10:51 34 52.0 N 116 23.3 W  2.5   53 km (33 mi) SSW  of Baker, CA
 9773281  2.1  2002/03/25 04:21:15 34  2.6 N 117 15.6 W 16.3    1 km ( 0 mi) SW   of Loma Linda, CA
 9773533  3.0  2002/03/26 01:10:12 32 18.8 N 115 19.6 W  7.0   42 km (26 mi) SSE  of Calexico, CA
 9773557  3.0  2002/03/26 03:28:33 32 48.7 N 115 36.3 W 16.5    5 km ( 3 mi) WNW  of El Centro, CA
               FELT in El Centro, Imperial
 9773621  2.8  2002/03/26 10:20:47 32 17.1 N 115 18.3 W  7.0   46 km (29 mi) SSE  of Calexico, CA
 9773629  3.7  2002/03/26 11:44:27 32 17.6 N 115 19.3 W  7.0   45 km (28 mi) SSE  of Calexico, CA
               FELT in Mexicali, El Centro, Brawley
 9773785  3.0  2002/03/27 05:23:08 34 31.5 N 116 17.5 W  8.8   43 km (27 mi) N    of Joshua Tree, CA
 9773789  2.9  2002/03/27 05:23:18 32 15.9 N 115 19.0 W  7.0   48 km (30 mi) SSE  of Calexico, CA
 9773813  2.9  2002/03/27 07:08:02 32 18.7 N 115 19.2 W  7.0   43 km (27 mi) SSE  of Calexico, CA
 9773949  2.4  2002/03/27 13:28:42 32 18.7 N 115 19.3 W  7.0   43 km (27 mi) SSE  of Calexico, CA
 9774045  3.0  2002/03/27 22:56:08 33 21.0 N 115 45.1 W  5.1    2 km ( 1 mi) W    of Bombay Beach, CA
 9774081  1.9  2002/03/28 05:57:17 32 40.0 N 115 52.2 W  7.5   14 km ( 9 mi) ESE  of Ocotillo, CA
        -------------------------------------------------------------------------------------------


March 27, 2002

Commentary

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

At 10:56 pm this evening, there was a M3.0 quake, located 1 miles
west of Bombay Beach, along the northeastern edge of the Salton Sea.
This location is where the Brawley Seismic Zone joins the southern
end of the San Andreas fault, so the quake might be related to either
of those structures. So far, we have no reports that the quake was
felt.

Commentary

Filed under: Old Commentary — kate @ 7:23 am

There has also been another M3.0 quake in northern Baja, 25 miles
south-southeast of Calexico. This happened at 7:08 am this morning.

Commentary

Filed under: Old Commentary — kate @ 6:17 am

A M3.0 Hector Mines aftershock occurred early this morning, at 5:23
am. The location was 26 miles north of Joshua Tree. It was not,
as far as we know, felt.

March 26, 2002

Commentary

Filed under: Old Commentary — kate @ 12:03 pm

At 11:44 am this morning, there was a M3.5 quake south of the
U.S./Mexico border, 26 miles south-southeast of Calexico. There has
been significant acitivity in this general area for about the last
month, since a M5.2 on February 22. Today’s quake was felt in
Mexicali.

Commentary

Filed under: Old Commentary — kate @ 7:09 am

Early this morning, at 3:28 am, there was a M3.1 quake in the
western Imperial Valley. The epicenter was located 3 miles
west of El Centro. We have reports that the quake was felt in El
Centro and Imperial.

March 25, 2002

Commentary

Filed under: Old Commentary — kate @ 7:34 am

There were a few small quakes of note over the weekend, only one of
which has been reported felt. The first quake
was a M3.0 at 3:37 pm on Friday, in the southern Sierras 19 miles
west-southwest of Coso Jucntion. This is an isolated area, so we
received to “felt reports”.

The “felt” quake was a M3.4 at 4:27 am Saturday, located 5 miles
east of Big Bear City. It was felt in epicentral area, with a
maximum intensity of MMI III. The focal mechanism shows oblique
thrust.

Early this morning, at 3:25 am, there was a M2.8 in the Mojave Desert,
14 miles west-northwest of Ludlow. This quake was a Hector
Mines aftershock, which was not reported felt.

March 22, 2002

Commentary

Filed under: Old Commentary — kate @ 2:16 pm

Another small event was felt in Imperial Valley early this afternoon,
at 2:01 pm. This quake had a magnitude of M2.6, and was located
6 miles north-northwest of Calexico. It was felt in El Centro.

Commentary

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

At 1:15 pm today, we had a M2.9 aftershock to last Saturday’s offshore
M4.6 quake. Today’s quake was located 18 miles west-northwest of
Santa Barbara Island, which, incidently, is 30 miles or so due south
of Ventura, not near Santa Barbara.

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