SOUTHERN CALIFORNIA
SEISMOGRAPHIC NETWORK
A Cooperative Project of
Caltech and the U.S. Geological Survey
December 12, 1996
Weekly Earthquake Report for Southern California
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December 5 - 11, 1996
Prepared by: Kate Hutton, Seismological Laboratory
(kate@bombay.gps.caltech.edu)
Lucy Jones, U. S. Geological Survey
California Institute of Technology
For further information, please contact the authors or the
Caltech Public Relations Office at 818-395-6327. For daily
updates, call our Earthquake Information Hotline: 818-395-6977.
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This week's Report covers the time period from midnight Thursday
morning, December 5, Universal Time (ie. GMT), to midnight
Wednesday night, December 11, Universal Time. In local time,
the period of coverage is from 4 p.m., December 4, Pacific
Standard Time, to 4 p.m., December 11, Pacific Standard Time.
We detected and processed 540 earthquakes during the seven-day
period covered.
The high seismicity this week is because of the continuing
aftershocks of the M5.3 earthquake that occurred on November 27
near Coso Juntion in the Owens Valley. Since November 27, we have
processed 1220 aftershocks to that event. Of this week's earth-
quakes, 332 events were Coso aftershocks, including three above M3:
a M3.5 on Friday morning, a M3.3 on Tuesday evening and a M3.4
early Wednesday morning. We received no felt reports for any of
these events. Given the rate of aftershocks in the last two weeks
(slightly higher than an "average" California aftershock sequence,
but very typical for the Owens Valley), we would expect to have
one or two more M3 aftershocks in the next week. Except for the
Coso aftershocks it was a nice, seismically quiet week in southern
California.
Table 1 lists the quakes this 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.
Table 1
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Date Time N Lat. W Long. Mag
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12/4 7:35 pm 36 4.2 117 38.7 2.0 Coso Range, 17 mi. E of
Coso Junction
12/4 10:33 pm 36 3.6 117 38.5 2.0 "
12/4 10:45 pm 34 59.3 116 57.5 2.0 7 mi. NNE of Barstow
12/5 1:36 am 36 5.2 117 39.8 2.7 16 mi. E of Coso Junction
12/5 2:08 am 36 5.2 117 39.4 2.1 "
12/5 4:33 am 36 3.9 117 38.6 2.1 17 mi. E of Coso Junction
12/5 5:36 am 36 4.3 117 39.0 2.3 16 mi. E of Coso Junction
12/5 8:26 am 36 17.2 120 23.7 2.6 10 mi. N of Coalinga
12/5 8:36 am 36 4.0 117 38.1 2.1 17 mi. E of Coso Junction
12/5 9:03 am 36 4.2 117 38.3 2.5 "
12/5 9:05 am 36 4.1 117 38.4 2.5 "
12/5 9:06 am 36 17.9 120 24.8 3.3 11 mi. NNW of Coalinga
12/5 9:23 am 36 4.7 117 38.8 2.1 17 mi. E of Coso Junction
12/5 9:32 am 36 5.0 117 38.0 2.0 "
12/5 11:44 am 36 4.8 117 38.8 2.2 16 mi. E of Coso Junction
12/5 2:43 pm 36 3.6 117 38.8 2.3 "
12/5 3:10 pm 36 3.5 117 38.8 2.7 "
12/5 3:33 pm 36 5.3 117 39.2 2.6 "
12/5 4:36 pm 36 4.6 117 38.6 2.9 17 mi. E of Coso Junction
12/5 5:04 pm 36 4.3 117 38.8 2.2 16 mi. E of Coso Junction
12/5 5:06 pm 36 4.0 117 38.7 2.2 "
12/6 7:49 am 36 4.5 117 38.7 2.4 17 mi. E of Coso Junction
12/6 10:30 am 36 4.6 117 39.0 3.5 16 mi. E of Coso Junction
12/6 10:44 am 36 4.4 117 38.9 2.6 "
12/6 12:51 pm 34 59.3 116 56.6 2.4 8 mi. NNE of Barstow
12/6 3:49 pm 36 4.8 117 39.1 2.1 16 mi. E of Coso Junction
12/6 5:58 pm 36 4.9 117 39.3 2.0 "
12/6 10:24 pm 33 23.3 116 24.3 2.6 9 mi. NNW of Borrego
Springs
12/7 5:20 am 36 4.2 117 38.9 2.4 16 mi. E of Coso Junction
12/7 9:18 am 36 4.1 117 39.0 2.4 "
12/7 10:49 am 35 47.0 117 40.1 2.5 11 mi. N of Ridgecrest
12/8 12:39 am 36 4.5 117 39.2 2.3 16 mi. E of Coso Junction
12/8 3:56 pm 34 13.0 118 35.2 2.0 1 mi. NE of Canoga Park
12/8 4:34 pm 36 3.8 117 38.6 2.0 17 mi. E of Coso Junction
12/8 8:27 pm 36 4.6 117 38.0 2.3 "
12/9 1:13 am 35 59.8 117 55.2 2.2 3 mi. SSE of Coso Junction
12/9 2:32 am 34 19.7 116 27.6 2.1 14 mi. N of Yucca Valley
12/9 8:53 am 34 56.4 118 59.2 2.0 3 mi. W of Grapevine
12/9 12:40 pm 35 39.6 117 32.0 2.0 7 mi. ENE of Ridgecrest
12/9 3:19 pm 36 4.5 117 38.5 2.4 17 mi. E of Coso Junction
12/9 4:30 pm 36 4.7 117 38.2 2.4 "
12/9 5:06 pm 36 4.0 117 38.2 2.8 "
12/9 5:06 pm 36 3.8 117 38.0 2.5 "
12/9 5:10 pm 35 39.5 117 32.2 2.6 7 mi. ENE of Ridgecrest
12/9 5:33 pm 36 4.1 117 37.9 2.1 17 mi. E of Coso Junction
12/9 5:47 pm 36 3.8 117 39.9 2.2 15 mi. E of Coso Junction
12/9 6:06 pm 35 39.5 117 32.3 2.2 7 mi. ENE of Ridgecrest
12/9 6:31 pm 35 39.6 117 32.1 2.1 "
12/9 7:15 pm 33 51.7 116 49.7 2.0 4 mi. SSW of Cabazon
12/9 8:33 pm 36 4.1 117 38.2 2.2 17 mi. E of Coso Junction
12/9 8:50 pm 36 24.7 117 51.8 2.4 11 mi. NE of Olancha
12/10 5:43 am 36 4.1 117 38.8 2.3 16 mi. E of Coso Junction
12/10 5:46 am 33 8.9 115 35.5 2.1 3 mi. ESE of Obsidian
Butte
12/10 8:21 am 34 9.5 116 25.8 2.2 2 mi. NNE of Yucca Valley
12/10 10:16 am 36 4.1 117 38.0 2.1 17 mi. E of Coso Junction
12/10 11:22 am 34 5.4 117 18.9 2.0 1 mi. SW of San Bernardino
12/10 9:01 pm 36 5.0 117 39.3 3.3 16 mi. E of Coso Junction
12/11 12:01 am 36 4.0 117 38.3 2.0 17 mi. E of Coso Junction
12/11 1:05 am 36 5.4 117 39.3 3.4 16 mi. E of Coso Junction
12/11 1:08 am 36 5.5 117 39.3 2.2 "
12/11 1:27 am 34 35.9 116 16.5 2.5 32 mi. N of Joshua Tree
12/11 3:54 am 36 5.0 117 40.1 2.0 15 mi. E of Coso Junction
12/11 6:03 am 32 39.7 115 40.8 2.1 11 mi. SW of El Centro
12/11 7:27 am 36 4.1 117 38.4 2.3 17 mi. E of Coso Junction
12/11 11:10 am 36 5.0 117 39.3 2.2 16 mi. E of Coso Junction
12/11 11:48 am 36 3.8 117 38.5 2.0 17 mi. E of Coso Junction
12/11 2:15 pm 32 39.3 115 40.4 2.0 10 mi. W of Calexico
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