SOUTHERN CALIFORNIA
	     	           SEISMOGRAPHIC NETWORK

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


						March 6, 1997

		Weekly Earthquake Report for Southern California
		------------------------------------------------
        	          February 27 - March 5, 1997

	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, February 27, Universal Time (ie. GMT), to midnight 
	Wednesday night, March 5, Universal Time.  In local time, 
	the period of coverage is from 4 p.m., February 26, Pacific 
	Standard Time, to 4 p.m., March 5, Pacific Standard Time.
	We detected and processed 256 earthquakes during the seven-day
	period covered.
		Although the total number of quakes this week was
	not much smaller than it has been, there were no M3+'s.  The
	largest event was a M2.9 early Tuesday morning near the 
	Garlock Fault in the northern Mojave Desert.  It's focal
	mechanism was left-lateral strike slip consistent with that
	fault.
		The only quake reported felt was a small (M2.1), 
	shallow event underneath of Fontana last Friday morning.
                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  
	-------------------------------------------------------------
         2/27  1:53 am  34 47.7  116 17.9  2.1  34 mi. SSW of Baker
         2/27  4:36 pm  35 43.0  117 43.4  2.4  7 mi. NNW of Ridgecrest
         2/28  2:17 am  34  7.0  117 26.8  2.1  Under Fontana; FELT
         2/28  4:09 am  36  4.6  117 38.5  2.1  17 mi. E of Coso Junction
         2/28  3:08 pm  32 25.4  118  8.9  2.8  29 mi. SSE of San Clemente 
						Is. (SE tip)
         2/28  5:16 pm  36  5.6  117 39.8  2.1  16 mi. E of Coso Junction
         2/28  5:18 pm  36  5.4  117 40.0  2.3  	"
         2/28  5:41 pm  36  5.5  117 40.0  2.4  	"
         2/28  6:14 pm  36  6.3  117 40.2  2.3  	"
         2/28  6:28 pm  34  0.1  117 34.8  2.1  6 mi. SE of Ontario
         3/1   3:31 am  32 57.2  115 32.4  2.1  Under Brawley
         3/1  12:40 pm  33 59.8  117  9.1  2.6  4 mi. SSE of Redlands
         3/1   1:05 pm  34  7.1  117 26.8  2.1  Under Fontana
         3/1   2:42 pm  36  5.5  117 40.0  2.4  16 mi. E of Coso Junction
         3/1   7:35 pm  33 59.8  116 56.6  2.4  5 mi. NNE of Beaumont
         3/2   1:45 am  34  5.8  116 59.5  2.2  5 mi. NNE of Yucaipa
         3/2   2:15 am  34  9.8  116 25.5  2.1  3 mi. NNE of Yucca Valley
         3/2   7:52 am  33 19.0  116 53.5  2.0  3 mi. SSW of Palomar 
						Observatory
         3/2   8:04 am  32  7.5  116 40.1  2.0  36 mi. SE of San Ysidro
         3/2   8:45 am  36  5.7  117 38.5  2.0  17 mi. E of Coso Junction
         3/3   4:16 am  33 11.4  115 36.4  2.6  2 mi. NE of Obsidian Butte
         3/3   4:55 am  33 11.5  115 36.2  2.4  	"
         3/3   6:42 am  35  0.1  116 57.5  2.1  8 mi. NNE of Barstow
         3/4   2:54 am  35 34.8  117  9.6  2.9  17 mi. SE of Trona
         3/4   6:45 am  36  5.5  117 40.0  2.2  16 mi. E of Coso Junction
         3/4   6:48 am  34 28.1  116 30.1  2.0  24 mi. N of Yucca Valley
         3/4   6:59 am  35 40.7  118  6.5  2.7  20 mi. E of town of Lake 
						Isabella
         3/4  11:53 am  36  4.6  117 39.0  2.7  16 mi. E of Coso Junction
         3/5  12:40 am  36  5.4  117 39.9  2.3  	"
         3/5   7:56 am  35 35.0  117  9.3  2.2  17 mi. SE of Trona
	-------------------------------------------------------------