From: cowen@jade.ucdavis.edu
Newsgroups: ca.earthquakes,sci.geo.geology
Subject: Weekly Caltech Report, 13 August1992
Date: 17 Aug 92 23:17:39 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 very lightly, but the information is unaffected.

Weekly Earthquake Report for Southern California, August 6 - 12, 1992
By 
Helen Qian, Seismological Laboratory
Kathy Watts, 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.

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

This week's Report covers the seven days to midnight Wednesday 
night, August 12, PDT. Aftershocks of the Landers earthquake 
relentlessly continue. With the seismicity twenty times that of 
the pre-Landers days, it may be a while before we can expect to 
keep up with daily data processing. The map this week includes 
most earthquakes of M2.5 or larger, plus many smaller ones that 
happen to have got through the system. A few small events may 
appear twice (the consequence of using data from more than one 
computer), but we have tried to keep this to a minimum. 
There are 568 events on the map.
	The largest event this week was the M3.9 at 11:11 p.m. 
Monday night, 5 miles SE of Yucca Valley. We got very few 
inquiries, but it must have been widely felt in the desert towns.  
In fact, this week our real time processor located at least ten 
quakes that were large enough to be easily felt by the local 
residents. This does not include the smaller quakes (in the 
M2.5-3.0 range) that are being felt by everyone in Big Bear, 
Yucaipa, Barstow, Yucca Valley, Landers, and of course,
Ridgecrest.
		Table 1 lists earthquakes of M2.5 or larger this week, for a 
total of 63. Times are local times; if you want GMT, add 7 hrs.
to the PDT listed.



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

	-------------------------------------------------------------
8/ 6 12:27 am  34  3.6  116 21.7  2.6   6 mi. SE of Yucca Valley 
8/ 6  1:19 am  34 58.8  116 56.7  2.6   7 mi. NE of Barstow       
8/ 6  1:24 am  34 33.5  116 33.5  2.8   23 mi. ENE of Lucerne Valley
8/ 6  6:14 am  34 20.6  116 27.2  3.0   15 mi. N of Yucca Valley  
8/ 6  7:49 am  34 37.7  116 37.7  3.0   22 mi. NE of Lucerne Valley
8/ 6  8:02 am  34 10.7  116 52.3  2.6   5 mi. SSE of town of Big Bear Lake 
8/ 6  8:30 am  35  0.7  116 57.8  2.6   9 mi. NNE of Barstow     
8/ 6  8:38 am  34 55.9  116 50.5  2.5   10 mi. ENE of Barstow     
8/ 6  9:51 am  34 13.6  116 15.3  3.4   13 mi. NE of Yucca Valley   
8/ 6 10:07 am  34 30.9  116 32.5  2.6   24 mi. NE of Big Bear City  
8/ 6 10:23 am  34 36.1  116 34.4  3.5   23 mi. ENE of Lucerne Valley 
8/ 6 11:09 am  34  6.0  116 53.5  2.5   3 mi. W of Mt. San Gorgonio
8/ 6  1:37 pm  34 26.8  116 30.9  2.6   23 mi. N of Yucca Valley  
8/ 6  3:00 pm  34 39.4  116 40.8  2.8   21 mi. NE of Lucerne Valley
8/ 6  3:15 pm  34 10.5  116 25.8  2.6   3 mi. NNE of Yucca Valley  
8/ 6  4:43 pm  34 59.0  116 57.2  2.7   7 mi. NNE of Barstow       
8/ 6  5:33 pm  34 58.6  116 57.4  2.6   7 mi. NNE of Barstow       
8/ 6  5:43 pm  34 16.1  116 46.4  3.7   4 mi. E of Big Bear City 
8/ 6  6:13 pm  34  6.6  116 23.4  2.8   3 mi. E of Yucca Valley  
8/ 6  6:13 pm  34  6.9  116 22.8  2.5   3 mi. E of Yucca Valley  
8/ 6  6:39 pm  34 14.7  116 25.8  2.6   8 mi. N of Yucca Valley  
8/ 6  7:01 pm  34  7.1  116 23.4  2.5   3 mi. E of Yucca Valley  
8/ 6  7:04 pm  34  6.9  116 23.4  3.0   3 mi. E of Yucca Valley  
8/ 6  7:11 pm  34 25.4  116 28.6  3.0   21 mi. N of Yucca Valley  
8/ 6  7:11 pm  34  6.7  116 23.6  3.1   2 mi. E of Yucca Valley  
8/ 6  7:21 pm  35  4.4  116 40.1  2.6   22 mi. SSE of Goldstone (dry) Lake
8/ 6  7:21 pm  34  6.3  116 23.2  3.4   3 mi. ESE of Yucca Valley
8/ 6 10:42 pm  34  6.4  116 59.1  2.7   9 mi. SE of Running Springs
8/ 7  5:44 am  34  7.3  116 23.5  2.5   3 mi. E of Yucca Valley  
8/ 7  5:51 am  34 56.9  116 55.7  2.7   6 mi. NE of Barstow       
8/ 7  6:56 am  34 14.2  116 53.2  2.9   1 mi. ESE of town of Big Bear Lake 
8/ 7  7:17 am  34 26.7  116 30.1  3.5   22 mi. N of Yucca Valley
8/ 7  8:22 am  34 34.9  116 28.9  2.7   32 mi. N of Yucca Valley
8/ 7  9:26 am  34  0.1  117 10.7  2.6   3 mi. S of Redlands     
8/ 7 10:32 am  34 56.7  116 55.9  2.7   6 mi. NE of Barstow     
8/ 7 11:39 am  34 37.7  116 38.4  2.5   21 mi. NE of Lucerne Valley
8/ 7 12:04 pm  34 13.1  116 44.6  3.2   7 mi. ESE of Big Bear City 
8/ 7 12:16 pm  36 49.0  118 39.2  3.1   25 mi. NW of Mt. Whitney   
8/ 7  1:01 pm  34 28.6  116 30.3  2.6   25 mi. N of Yucca Valley  
8/ 7  8:40 pm  34 30.5  116 31.0  2.9   27 mi. N of Yucca Valley   
8/ 7  9:26 pm  34 56.4  116 47.0  2.5   14 mi. ENE of Barstow        
8/ 7  9:37 pm  35 50.5  117 40.3  2.6   15 mi. N of Ridgecrest     
8/ 8  1:08 am  34 37.8  116 33.2  2.8   25 mi. ENE of Lucerne Valley
8/ 8  8:12 am  34 20.2  116 53.9  2.5   5 mi. NNW of Big Bear City 
8/ 8  8:37 am  34 22.6  116 27.5  3.4   17 mi. N of Yucca Valley  
8/ 8 11:01 am  34 58.8  116 57.0  2.6   7 mi. NNE of Barstow       
8/ 8  1:59 pm  35  0.9  116 57.8  2.5   9 mi. NNE of Barstow       
8/ 8  4:46 pm  34 56.8  116 55.6  3.1   6 mi. NE of Barstow       
8/ 8  6:39 pm  34  8.7  116 33.4  2.5   6 mi. WNW of Yucca Valley  
8/ 8  8:48 pm  34 16.2  116 42.7  2.5   8 mi. E of Big Bear City 
8/ 8  9:57 pm  35  0.6  116 58.4  3.1   8 mi. NNE of Barstow       
8/ 9  3:13 am  34  0.7  116 21.5  2.6   8 mi. SSE of Yucca Valley  
8/ 9  4:17 am  34 38.5  116 40.1  2.7   20 mi. NE of Lucerne Valley
8/ 9  4:27 am  35  7.4  116 48.4  2.6   16 mi. SSE of Goldstone (dry) Lake
8/ 9  8:30 am  34 21.4  116 27.5  2.7   16 mi. N of Yucca Valley    
8/ 9 12:20 pm  36  2.8  117 35.5  2.8   21 mi. SSW of Panamint Springs
8/ 9  2:20 pm  34  3.4  116 22.1  2.5   6 mi. SE of Yucca Valley  
8/ 9  7:06 pm  34 58.5  116 57.2  3.2   7 mi. NNE of Barstow       
8/ 9 11:05 pm  34 34.5  116 33.9  2.8   23 mi. ENE of Lucerne Valley
8/ 9 11:05 pm  34 26.2  116 27.5  2.9   22 mi. N of Yucca Valley
8/ 9 11:07 pm  34 26.5  116 27.9  2.5   22 mi. N of Yucca Valley
8/ 9 11:37 pm  34 55.7  116 55.5  2.6   6 mi. ENE of Barstow
8/10  3:03 am  35  6.8  116 40.9  2.5   20 mi. SE of Goldstone (dry) Lake  
8/10  5:22 am  34 34.4  116 25.7  2.5   31 mi. N of Yucca Valley   
8/10 12:44 pm  33 59.9  116 19.5  2.5   10 mi. SE of Yucca Valley   
8/10 12:44 pm  34  0.0  116 19.1  3.2   10 mi. SE of Yucca Valley   
8/10  2:37 pm  35 49.2  118  4.2  3.5   16 mi. SSW of Coso Junction  
8/10  2:46 pm  35  1.0  116 57.8  2.5   9 mi. NNE of Barstow        
8/10  2:54 pm  34  5.8  116 24.0  2.8   2 mi. ESE of Yucca Valley   
8/10  2:59 pm  34 27.6  116 29.3  2.5   23 mi. N of Yucca Valley   
8/10  4:11 pm  34 58.4  116 57.7  2.5   6 mi. NNE of Barstow        
8/10  5:49 pm  34  8.8  116 25.5  2.5   2 mi. NNE of Yucca Valley   
8/10 10:24 pm  35 41.4  117 36.3  2.5   5 mi. NE of Ridgecrest     
8/10 11:11 pm  34  3.6  116 22.4  3.9   5 mi. SE of Yucca Valley   
8/10 11:14 pm  33  3.2  114 49.5  2.7   27 mi. NNW of Yuma, Arizona  
8/11  4:28 am  34 37.5  116 36.5  3.1   22 mi. ENE of Lucerne Valley 
8/11  5:29 am  34 57.7  116 56.4  2.6   6 mi. NE of Barstow        
8/11  5:52 am  34 43.4  116  5.1  2.6   37 mi. S of Baker          
8/11  9:23 am  36  1.2  118  3.5  2.5   6 mi. WSW of Coso Junction  
8/11  9:31 am  34 37.9  116 40.2  2.6   20 mi. NE of Lucerne Valley 
8/11  2:13 pm  34 33.8  116 26.7  2.8   30 mi. N of Yucca Valley   
8/11  2:23 pm  34 56.5  116 46.7  2.5   14 mi. ENE of Barstow        
8/11  4:08 pm  34 14.9  116 26.0  3.4   8 mi. N of Yucca Valley   
8/11  4:10 pm  34 14.9  116 26.0  2.8   8 mi. N of Yucca Valley   
8/11  4:27 pm  34 14.6  116 25.6  3.4   8 mi. N of Yucca Valley   
8/11  5:36 pm  35  1.1  116 58.0  2.5   9 mi. NNE of Barstow        
8/11  8:26 pm  33  3.9  116 36.9  3.0   1 mi. SW of Julian         
8/11  8:26 pm  33  3.9  116 36.8  3.3   1 mi. SW of Julian         
8/11  8:28 pm  33  4.0  116 36.6  2.6   1 mi. SW of Julian         
8/11  8:28 pm  33 32.1  115 41.0  2.7   13 mi. NNE of Bombay Beach   
8/12  1:17 am  34 32.7  116 33.0  2.5   23 mi. ENE of Lucerne Valley 
8/12  1:52 am  34  6.3  116 22.6  2.8   3 mi. ESE of Yucca Valley   
8/12  1:52 am  34  8.7  116 24.2  2.6   3 mi. NE of Yucca Valley   
8/12  1:52 am  33 59.5  116 16.9  2.7   12 mi. SE of Yucca Valley   
8/12  2:23 am  34  4.1  116 43.9  2.5   5 mi. ESE of Mt. San Gorgonio
8/12  4:00 am  34 56.0  116 51.2  2.5   10 mi. ENE of Barstow        
8/12  5:49 am  34 30.8  116 31.8  2.8   27 mi. N of Yucca Valley   
8/12  6:26 am  34  6.6  116 59.2  2.6   9 mi. SE of Running Springs
8/12  8:12 am  34  6.7  116 59.5  3.4   9 mi. SE of Running Springs
8/12  8:35 am  34 55.8  116 51.8  2.5   9 mi. ENE of Barstow   
8/12  8:44 am  34  6.4  116 58.9  2.8   10 mi. SSW of town of Big Bear Lake
8/12  8:56 am  34  6.7  116 59.0  2.6   10 mi. SSW of town of Big Bear Lake
8/12  9:02 am  34  6.9  116 59.3  2.5   8 mi. SE of Running Springs
8/12  9:09 am  34  6.6  116 59.3  3.1   9 mi. SE of Running Springs
8/12  9:34 am  34 29.5  116 30.9  2.6   26 mi. N of Yucca Valley   
8/12  9:37 am  34  8.5  117  1.8  2.7   6 mi. SE of Running Springs
8/12  3:41 pm  34 55.7  116 55.3  2.5   6 mi. ENE of Barstow        
8/12  3:59 pm  34 56.0  116 51.3  2.6   10 mi. ENE of Barstow        
8/12  8:00 pm  34  9.1  116 25.5  2.6   2 mi. NNE of Yucca Valley   
8/12 10:04 pm  34  6.7  116 59.2  2.5   9 mi. SE of Running Springs
         
	-------------------------------------------------------------
Richard Cowen