From: cowen@JADE.UCDAVIS.EDU
Newsgroups: ca.earthquakes,sci.geo.geology
Subject: Caltech Weekly Earthquake Report, to December 17, 1992
Date: 18 Dec 92 00:57:32 GMT
Reply-To: cowen@JADE.UCDAVIS.EDU
Followup-To: ca.earthquakes
Organization: Geology Department, University of California, Davis

Here is the text of the Caltech weekly report. It accompanies a postscript
map that I can't or won't re-post because it's a very big file. You can
ftp the text and map from seismo.gps.caltech.edu under successive
directories pub and ca.earthquakes.
I've edited the text lightly, but the information is unaffected.

Weekly Earthquake Report for Southern California, December 10 - 16, 1992

Kate Hutton, Seismological Laboratory (kate@bombay.gps.caltech.edu)
Lucy Jones, U.S. Geological Survey
California Institute of Technology

This document is a commentary on current seismic activity. The earthquakes
discussed have been detected and processed automatically. All epicenters and
magnitudes have been reviewed to exclude obvious blunders; however, they must
still be considered preliminary. For further information, please contact the
authors or the Caltech Public Relations Office at (818) 356-6326.

	--------------------------------
Aftershocks of the Landers earthquake continued during the 7 days to 
midnight Wednesday night, December 16, PST, as they will for several years 
at least. The map includes a virtually complete set of earthquakes of M2.0 
or larger, plus many smaller ones, 444 in all.
The phrase for the week is simply "more of the same". The largest quake was 
a M3.9 north of Yucca Valley on Thursday afternoon. The second largest was 
a M3.7 near Barstow on Saturday night. Both were Landers aftershocks. For 
those interested in the progress of the data processing, here is the tally:
				Processed	Still to do
				---------	-----------
June 28 - 30    860	541
July		 2,888	8,756
August	1,571	6,300
September	 2,024	3,838
October	2,561	1,709
November	 2,294	1,173
December	 1,249 so far	   668 so far
				---------	-----------
		13,447	22,985

The numbers in the "still to to" column correspond to on-line system 
triggers, which may contain multiple earthquakes. Taking this into account, 
we easily have 45,000 earthquakes for the second half of 1992. Our normal
processing load for a six month period is about 5,000.
The table lists the quakes that were M2.3 or larger. Times are local; for
GMT, add 8 hrs. to the PST listed.

	Table 1
	-------
	Date  Time      N Lat.   W Long.   Mag

	-------------------------------------------------------------
        12/10  4:20 am  34 16.1  116 54.3  2.7  1 mi. N of town of Big Bear Lake
        12/10  6:39 am  34 18.4  116 26.2  2.5  12 mi. N of Yucca Valley
        12/10  8:13 am  35  0.4  116 56.8  2.3  9 mi. NNE of Barstow
        12/10 10:23 am  34  9.1  116 24.8  3.4  2 mi. NE of Yucca Valley
        12/10 12:35 pm  34 57.8  116 56.0  2.4  7 mi. NE of Barstow
        12/10 12:47 pm  34 16.3  116 24.1  2.9  10 mi. NNE of Yucca Valley
        12/10  4:04 pm  34 36.9  116 37.8  2.8  21 mi. ENE of Lucerne Valley
        12/10  4:45 pm  34 22.5  116 52.4  3.0  6 mi. SE of Lucerne Valley
        12/10  5:38 pm  34 16.3  116 24.1  3.9  10 mi. NNE of Yucca Valley Felt.
        12/10  5:40 pm  34 16.5  116 23.9  2.9  	"
        12/10  5:52 pm  34 16.2  116 24.2  2.7  	"
        12/10  9:14 pm  34 21.3  116 56.0  2.5  6 mi. S of Lucerne Valley
        12/10 11:41 pm  35  7.8  116 50.4  2.6  15 mi. S of Goldstone (dry) Lake
        12/11  3:11 am  34 21.1  116 55.4  2.4  6 mi. S of Lucerne Valley
        12/11  3:11 am  32 36.3  117 20.0  2.7  12 mi. SW of the I5/I8
interch., San Diego
        12/11  4:13 am  33 11.5  115 33.6  2.3  4 mi. SW of Niland
        12/11  4:47 am  33 11.5  115 34.0  2.9  	"
        12/11  4:56 am  34 59.1  116 56.8  2.7  7 mi. NNE of Barstow
        12/11  7:39 am  34 21.2  116 53.8  2.7  6 mi. NNW of Big Bear City
        12/11 12:00 pm  34 22.9  116 27.4  2.7  18 mi. N of Yucca Valley
        12/11 12:45 pm  34 22.4  116 52.8  2.3  6 mi. SE of Lucerne Valley
        12/11  1:06 pm  34 16.1  116 24.0  2.8  10 mi. NNE of Yucca Valley
        12/11  1:46 pm  34 22.4  116 52.4  2.3  6 mi. SE of Lucerne Valley
        12/11  4:31 pm  34 21.4  116 53.7  3.4  6 mi. SSE of Lucerne Valley
Felt.
        12/11  5:08 pm  34 11.2  116 47.0  2.7  6 mi. NNE of Mt. San Gorgonio
        12/11  7:25 pm  33 57.2  116 23.3  2.4  6 mi. E of Desert Hot Springs
        12/11  8:20 pm  35 56.4  117 40.9  2.3  16 mi. ESE of Coso Junction
        12/11  9:36 pm  34 16.5  116 24.3  3.1  11 mi. NNE of Yucca Valley Felt.
        12/12 12:07 am  34 22.4  116 54.3  2.7  5 mi. SSE of Lucerne Valley
        12/12  6:38 am  35  0.4  116 57.8  2.7  8 mi. NNE of Barstow
        12/12  7:10 am  32 59.7  117 48.0  2.3  27 mi. WSW of Oceanside
        12/12  7:28 am  34 38.2  116 30.7  2.3  28 mi. ENE of Lucerne Valley
        12/12 11:40 am  34 36.4  116 38.2  2.4  20 mi. ENE of Lucerne Valley
        12/12  3:59 pm  34 22.2  116 52.7  2.6  6 mi. SE of Lucerne Valley
        12/12  4:46 pm  34 30.9  116 31.1  2.3  27 mi. N of Yucca Valley
        12/12  8:14 pm  34 58.9  116 56.8  3.7  7 mi. NE of Barstow Felt.
        12/12  9:30 pm  34  0.9  116 20.6  3.1  9 mi. SE of Yucca Valley
        12/12 11:15 pm  34  0.0  116 20.3  2.5  	"
        12/12 11:31 pm  36 25.5  117 53.6  2.6  11 mi. NNE of Olancha
        12/13  3:47 am  34 21.8  116 52.4  2.3  6 mi. N of Big Bear City
        12/13  3:48 am  34 56.7  116 55.8  2.4  6 mi. NE of Barstow
        12/13  4:12 am  34 58.7  116 56.7  2.3  	"
        12/13  4:32 am  34  7.3  116 23.9  2.6  2 mi. E of Yucca Valley
        12/13  6:15 am  34 21.1  116 53.8  2.3  6 mi. NNW of Big Bear City
        12/13 11:14 am  34 34.6  116 35.2  2.4  22 mi. ENE of Lucerne Valley
        12/13 11:15 am  34 29.2  116 31.2  2.7  25 mi. N of Yucca Valley
        12/13  1:10 pm  33 58.7  116 18.8  2.9  10 mi. E of Desert Hot Springs
        12/13  1:57 pm  34 17.9  116 28.1  2.3  12 mi. N of Yucca Valley
        12/13  4:02 pm  34 32.6  116 33.3  2.5  23 mi. ENE of Lucerne Valley
        12/13  5:15 pm  34 18.5  116 25.0  3.0  13 mi. N of Yucca Valley
        12/13  5:21 pm  34 37.7  116 33.5  2.4  25 mi. ENE of Lucerne Valley
        12/13  6:13 pm  34 37.8  116 35.5  2.3  	"
        12/13  7:23 pm  34 12.9  116 27.0  2.3  6 mi. N of Yucca Valley
        12/14  1:58 am  34 57.2  116 56.6  3.2  6 mi. NE of Barstow
        12/14  4:46 am  34 32.5  116 32.7  2.3  23 mi. ENE of Lucerne Valley
        12/14  5:19 am  34 57.2  116 55.6  2.3  7 mi. NE of Barstow
        12/14  6:08 am  34 55.7  116 42.8  2.4  17 mi. E of Barstow
        12/14  9:15 am  32 33.2  115 52.3  2.3  14 mi. SSE of Ocotillo
        12/14  9:35 am  34 20.2  116 54.6  2.6  5 mi. NNW of Big Bear City
        12/14  9:46 am  34 20.4  116 54.7  3.0  6 mi. NNW of Big Bear City
        12/14  9:57 am  34  4.2  116 23.0  2.6  4 mi. SE of Yucca Valley
        12/14 11:52 am  34 58.5  116 47.9  3.2  14 mi. ENE of Barstow
        12/14  1:39 pm  34 16.5  116 44.5  2.3  6 mi. E of Big Bear City
        12/14  2:12 pm  34 29.8  116 30.5  2.3  26 mi. N of Yucca Valley
        12/14  2:42 pm  35  0.1  116 57.0  2.4  8 mi. NNE of Barstow
        12/14  2:49 pm  34 23.7  116 27.6  2.3  19 mi. N of Yucca Valley
        12/14  4:52 pm  35  4.0  116 59.8  2.3  12 mi. N of Barstow
        12/14 10:48 pm  34 15.7  116 44.1  3.0  6 mi. E of Big Bear City
        12/15  2:17 am  34 12.9  116 50.4  2.4  3 mi. SSE of Big Bear City
        12/15  6:26 am  34 58.2  116 56.5  2.3  7 mi. NE of Barstow
        12/15  6:53 am  34 38.0  116 40.0  2.4  20 mi. NE of Lucerne Valley
        12/15 12:07 pm  34 20.1  116 53.2  3.2  5 mi. NNW of Big Bear City
        12/15  3:11 pm  34  3.1  116 23.5  2.8  5 mi. SE of Yucca Valley
        12/15  4:18 pm  34 21.0  116 53.4  2.4  6 mi. NNW of Big Bear City
        12/15  8:42 pm  34  1.1  116 18.7  2.4  10 mi. SE of Yucca Valley
        12/15  9:18 pm  34 21.2  116 53.3  2.7  6 mi. NNW of Big Bear City
        12/16  1:55 am  34 37.5  116 32.7  3.3  25 mi. ENE of Lucerne Valley
        12/16  1:57 am  34 37.3  116 32.8  2.5  	"
        12/16  8:25 am  33 56.1  118 35.2  2.5  8 mi. SW of Santa Monica
        12/16 11:58 am  34 37.3  116 34.6  2.3  24 mi. ENE of Lucerne Valley
        12/16  2:03 pm  32 53.8  115 31.9  2.3  4 mi. S of Brawley
        12/16  2:31 pm  34 59.4  116 57.0  3.3  8 mi. NNE of Barstow
        12/16  4:07 pm  34 59.3  116 56.7  2.3  	"
        12/16  6:53 pm  34 38.2  116 40.0  2.5  20 mi. NE of Lucerne Valley
        12/16  8:33 pm  35 40.9  117 37.2  2.3  4 mi. NNE of Ridgecrest
	-------------------------------------------------------------
	
Newsgroups: ca.earthquakes