From: cowen@jade.ucdavis.edu
Newsgroups: ca.earthquakes,sci.geo.geology
Subject: Caltech Weekly Earthquake Reports
Date: 9 Oct 92 22:55:39 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.
This is the 1 October report, which was placed in the ftp files only
recently (not a complaint!).
Weekly Earthquake Report for Southern California, September 24 - 30, 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 in the 7 days to midnight
Wednesday night, September 30, PDT, as they will for several years at least.

The map includes a nearly complete set of earthquakes of M2.5 or larger, 
plus many smaller ones that happen to have made it through the data 
processing. There are 563 in all.
  Seven of the week's quakes were reported felt by the general public; 
all were aftershocks of either the Landers (Mw7.4) or the Big Bear 
(Mw6.4) earthquakes of June 28. The largest was the M3.7 on Tuesday 
afternoon near Yucca Valley. In addition, a M3.9 occurred near Coalinga. 
This quake was located in the area traditionally covered by the 
USGS in Menlo Park; please see their weekly report for details.
 Table 1 lists only earthquakes of M2.5 or larger. Times are local; 
for GMT add 7 hrs. to the PDT listed.

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

-------------------------------------------------------------
9/24  1:42 am  34  6.3  116 59.3  2.7  9 mi. SE of Running Springs
9/24  1:57 pm  35 47.4  118  0.1  2.5  17 mi. S of Coso Junction
9/24  2:44 pm  34 20.3  116 40.4  3.3  11 mi. ENE of Big Bear City  Felt
9/25  1:47 am  34 16.7  116 25.8  2.6  11 mi. N of Yucca Valley
9/25  7:40 am  34 16.4  116 41.7  2.5  9 mi. E of Big Bear City
9/25  7:59 am  34 16.3  116 26.7  3.5  10 mi. N of Yucca Valley   Felt
9/25 12:11 pm  34 20.4  116 27.8  2.5  15 mi. N of Yucca Valley
9/25  2:12 pm  36 42.8  116 13.2  3.0  Nevada
9/25  2:16 pm  36 45.9  116 12.4  2.9  	"
9/25  2:22 pm  33 16.9  116 14.2  2.7  8 mi. ENE of Borrego Springs
9/26  1:41 am  34 38.9  116 20.4  2.7  37 mi. N of Yucca Valley
9/26  9:58 am  35  1.1  116 58.0  2.5  9 mi. NNE of Barstow
9/26  7:44 pm  34  1.7  116 21.9  2.6  7 mi. SE of Yucca Valley
9/27 12:25 am  34 15.6  116 27.2  2.6  9 mi. N of Yucca Valley
9/27  5:42 am  33 57.0  117 13.6  2.5  7 mi. SSW of Redlands
9/27  9:59 am  36  1.3  119 51.4  3.9  29 mi. ESE of Coalinga Presumably felt
9/27 10:44 am  34  9.9  116 24.7  2.9  3 mi. NNE of Yucca Valley  Felt
9/27  4:19 pm  34 10.2  116 24.6  2.6  "
9/28  5:07 am  34  7.6  116 23.8  3.4  2 mi. ENE of Yucca Valley  Felt
9/28 10:32 am  34 39.3  116 30.9  2.7  28 mi. ENE of Lucerne Valley
9/28  4:56 pm  35 31.2  117 29.1  2.8  12 mi. SE of Ridgecrest
9/28  9:13 pm  34  2.2  116 19.0  2.5  9 mi. SE of Yucca Valley
9/28 10:31 pm  34  8.9  116 25.1  2.7  2 mi. NE of Yucca Valley
9/29  2:56 am  34 13.8  116 47.8  2.5  4 mi. SE of Big Bear City
9/29  3:24 am  34 58.6  116 56.4  3.1  7 mi. NE of Barstow
9/29  3:57 am  34 15.1  116 26.0  2.6  9 mi. N of Yucca Valley
9/29  3:58 am  34 15.0  116 26.0  2.6  "
9/29 11:57 am  36  1.7  117 58.0  2.8  1 mi. SW of Coso Junction
9/29  3:16 pm  34  3.5  116 22.4  3.7  5 mi. SE of Yucca Valley  Felt
9/29  3:30 pm  34 31.7  116 31.9  2.7  25 mi. NE of Big Bear City
9/29  5:52 pm  34 12.6  116 26.3  2.9  6 mi. N of Yucca Valley
9/29  6:50 pm  34  6.1  116 24.2  2.7  2 mi. ESE of Yucca Valley
9/30  6:30 pm  35 50.2  117 40.2  2.8  14 mi. N of Ridgecrest
9/30  8:11 pm  34 58.6  116 56.4  3.6  7 mi. NE of Barstow  Felt
9/30 11:14 pm  34 17.4  116 43.0  2.7  7 mi. ENE of Big Bear City
-------------------------------------------------------------
Some readers may be interested in the status of the data processing of
aftershocks, 
and the other earthquakes in the past few months:

6/25 - 7/1	XXXXXX000000
7/2 - 7/8	XXXXXXXXX00000000000000000000000
7/9 - 7/15	XXXXXX00000000000000000000
7/16 - 7/22	XXXXX00000000000000000
7/23 - 7/29	XXXXX000000000000000000
7/30 - 8/5	XXXX0000000000000000
8/16 - 8/12	XXXX000000000000000
8/13 - 8/19	XXXX00000000000000
8/20 - 8/26	XXX0000000000000
8/27 - 9/2	XX000000000000
9/3 - 9/9	XXX000000000000
9/10 - 9/16	XXX0000000000
9/17 - 9/23	XXXXX0000000
9/24 - 9/30	XXXXX00000

X represents 100 processed events and 0 represents at least 100 unprocessed
ones, considering that many unprocessed on-line "triggers" contain multiple
earthquakes. It is clear that it will be awhile before we have a final 
catalog.

Richard Cowen
Newsgroups: ca.earthquakes