SOUTHERN CALIFORNIA
	     	           SEISMOGRAPHIC NETWORK

			  A Cooperative Project of
	          Caltech and the U.S. Geological Survey


						September 19, 1996

		Weekly Earthquake Report for Southern California
		------------------------------------------------
        	             September 12 - 18, 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.
			--------------------------------
	This week's Report covers the time period from midnight Thursday
	morning, September 12, Universal Time (ie. GMT), to midnight 
	Wednesday night, September 18, Universal Time.  In local time, 
	the period of coverage is from 5 p.m., September 11, Pacific 
	Daylight Time, to 5 p.m., September 18, Pacific Daylight Time.  
	We detected and processed 295 earthquakes during the seven-day 
	period covered.
		Compared to the last two weeks, seismicity was very low,
	although the total number of quakes was about average for the
	year so far.  We only had one quake within our Seismographic
	Network that was above M3: that was a M3.8 last Thursday after-
	noon in the San Jacinto Fault Zone near Lake Perris.  It was
	felt, in the Idyllwild area and in Palm Desert.  The focal 
	mechanism was strike-slip, consistent with the strike of the
	San Jacinto Fault.
		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
	-------
	Date  Time      N Lat.   W Long.   Mag  
	-------------------------------------------------------------
         9/11  8:18 pm  35  5.6  117 29.3  2.1  11 mi. NE of Boron
         9/12  2:52 am  34 37.8  116 39.9  2.8  20 mi. NE of Lucerne 
						Valley
         9/12  4:15 am  36 17.0  120 22.3  3.2  10 mi. N of Coalinga
         9/12  4:41 am  33  3.1  117 45.8  2.3  26 mi. SSW of San Clemente
         9/12  4:42 am  33  4.1  117 45.7  2.1  	"
         9/12  7:48 am  34  3.5  117 15.6  2.2  Under Loma Linda
         9/12  9:50 am  33 10.9  115 36.3  2.8  1 mi. ENE of Obsidian 
						Butte
         9/12 10:56 am  34  1.8  117 15.2  2.2  1 mi. S of Loma Linda
         9/12  1:23 pm  34 14.2  119 43.7  2.2  12 mi. S of downtown Santa 
						Barbara
         9/12  2:18 pm  33 54.3  117  8.7  3.8  8 mi. N of Perris
						FELT
         9/13  3:09 am  35 58.9  117 50.8  2.5  7 mi. SE of Coso Junction
         9/13  8:52 pm  33 57.6  116 21.2  2.0  8 mi. E of Desert Hot 
						Springs
         9/13 10:18 pm  32 43.4  115 24.8  2.0  6 mi. NE of Calexico
         9/14  4:29 pm  32 21.6  118 18.3  2.3  31 mi. S of San Clemente 
						Is. 
         9/14  8:02 pm  34 25.8  116 29.4  2.1  21 mi. N of Yucca Valley
         9/14  8:30 pm  33 10.1  116 33.7  2.0  6 mi. NNE of Julian
         9/16  5:49 am  34 15.1  116 27.1  2.0  9 mi. N of Yucca Valley
         9/16  5:42 pm  33 26.9  117 58.3  2.1  11 mi. SSW of Newport 
						Beach
         9/17  1:59 am  36  6.9  117 51.1  2.3  Coso Range, 5 mi. ESE of 
						Haiwee Reservoir 
         9/17  3:14 pm  32 39.7  115 56.3  2.1  6 mi. SSE of Ocotillo
         9/17  5:59 pm  36 17.1  120 22.1  2.7  10 mi. N of Coalinga
         9/17  6:38 pm  36  0.7  117 49.7  2.1  7 mi. ESE of Coso Junction
         9/17 11:25 pm  35 58.1  117 39.2  2.2  17 mi. ESE of Coso 
						Junction
         9/18  1:44 am  34 18.3  118 25.0  2.0  1 mi. NE of San Fernando
         9/18  2:02 am  35  5.7  117 29.4  2.1  11 mi. NE of Boron
         9/18  2:18 am  36 18.5  120 20.7  2.6  11 mi. N of Coalinga
         9/18  8:53 am  34 37.3  116 34.9  2.1  24 mi. ENE of Lucerne 
						Valley
	-------------------------------------------------------------