February 16, 1995

		Weekly Earthquake Report for Southern California
		------------------------------------------------
        		      February 9 - 15, 1995

	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 818-395-6326.  For daily updates, call 
	our Earthquake Information Hotline: 818-395-6977.
			--------------------------------
	This week's Report covers the time period from midnight Thursday
	morning, February 9, Pacific Standard Time, to midnight 
	Wednesday night, February 15, 1995, Pacific Standard Time.  We 
	recorded 263 earthquakes of M1.0 or larger during the 7-day period 
	covered.
		Just about the only excitement this week was caused by
	the two "Valentine's Day earthquakes" on Tuesday night.  Both
	were aftershocks of the Northridge earthquake, and both were close
	to Granada Hills, although not at the same location.  The first
	and largest was a M3.2 at 6:54 pm, and the second was a M2.7 at
	12:40 the next morning.  There was initially some confusion with
	the 6:54 pm quake, since our automatic location software failed
	to locate it properly and, due to the poor location, failed to
	notify the duty seismologist.  Also possibly because of the poor
	location, the magnitude was underestimated at M2.9.  Other things 
	besides quakes can affect our signals, including electronic problems, 
	wind, and what we call "cultural noise" like traffic, etc.  Because 
	of these problems, one percent or so of the quakes have problems in 
	the automatic locator.  We are continually trying to improve the 
	percentages, but it's something to watch for if you are a user of 
	"finger quake@scec.gps.caltech.edu".  In the case of the Granada 
	Hills quake, we had improved information going out within a half 
	hour.
		Procedures went much more smoothly with the 12:40 am quake,
	although sometimes we wish folks would wait until 8 am to call about
	quakes that tiny!
		Speaking of tiny, we got one call about a M2.2 near Simi
	Valley on Sunday night.  We don't know whether to believe it was
	truly felt or just a coincidence that someone called at the right
	time.
		The table 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  
	-------------------------------------------------------------
         2/9   2:30 am  36 28.8  120 29.6  3.1  24 mi. NNW of Coalinga
         2/9   5:18 am  34 38.1  116 33.2  2.1  25 mi. ENE of Lucerne Valley
         2/9   7:38 am  34 16.4  118 22.7  2.3  3 mi. E of San Fernando
         2/9   9:58 pm  36  0.2  119 22.5  2.3  22 mi. SSW of Visalia
         2/10  2:02 am  32 34.1  117 59.5  2.2  26 mi. SE of San Clemente Is.
         2/10  4:53 am  34  2.9  117 16.9  2.3  Loma Linda, 1 mi. SE of the 
						I10/I215 interchange
         2/10 11:48 am  34 24.7  116 28.6  2.1  20 mi. N of Yucca Valley
         2/10 12:28 pm  33 14.9  116 21.9  2.2  Under Borrego Springs
         2/10  5:46 pm  35  4.5  118 23.8  2.2  4 mi. SE of Tehachapi
         2/11  7:00 am  35 33.2  118 54.3  2.0  12 mi. NNE of downtown 
						Bakersfield
         2/11  7:14 am  33 18.8  117 52.7  2.0  16 mi. SSW of Laguna Beach
         2/11 12:46 pm  35 55.8  117 40.0  2.3  17 mi. ESE of Coso Junction
         2/12  2:02 am  33 20.6  116 47.3  2.1  4 mi. E of Palomar 
						Observatory
         2/12  2:36 am  36 24.8  120 21.8  2.7  19 mi. N of Coalinga
         2/12  6:00 am  34  8.7  116 25.4  2.1  2 mi. NE of Yucca Valley
         2/12  6:29 am  32 48.4  116  8.8  2.3  10 mi. WNW of Ocotillo
         2/12  6:35 pm  35 50.5  118 19.6  2.1  16 mi. NNE of the town of 
						Lake Isabella
         2/12  8:42 pm  34 21.4  118 41.3  2.2  5 mi. NNE of Simi Valley
						FELT?
         2/12  8:43 pm  34 38.8  116 31.8  2.5  27 mi. ENE of Lucerne Valley
         2/13  6:00 am  34 23.9  116 27.3  2.4  19 mi. N of Yucca Valley
         2/13  2:02 pm  35 12.0  120 49.8  2.8  11 mi. S of Morro Bay
         2/13  2:37 pm  35 50.5  118 19.6  2.8  16 mi. NNE of the town of 
						Lake Isabella
         2/13  4:14 pm  34 17.6  118 27.2  2.0  1 mi. NW of San Fernando
         2/13  5:22 pm  32 48.9  118 18.0  2.1  2 mi. E of San Clemente Is.
         2/14  1:48 am  34 54.8  116 55.7  2.2  5 mi. ENE of Barstow
         2/14  6:09 am  35 31.6  118 15.1  2.5  14 mi. ESE of the town of 
						Lake Isabella
         2/14  7:25 am  36 11.7  118 18.3  2.6  17 mi. WSW of Olancha
         2/14  3:08 pm  35 12.1  120 52.9  2.4  11 mi. S of Morro Bay
         2/14  6:54 pm  34 15.2  118 28.8  3.2  2 mi. SE of Granada Hills
						FELT
         2/15 12:40 am  34 15.0  118 30.4  2.7  1 mi. S of Granada Hills
						FELT
         2/15  4:48 am  36 23.1  117 58.7  2.1  7 mi. NNE of Olancha
         2/15  7:38 am  34 34.1  116 35.6  2.1  21 mi. ENE of Lucerne Valley
         2/15 10:05 am  36 59.4  117 34.8  2.2  35 mi. NW  of Stovepipe Wells
         2/15  5:10 pm  34  7.2  116 23.9  2.1  2 mi. E of Yucca Valley
         2/15 10:33 pm  33 52.0  118 16.5  2.0  Near the I110/I405 
						interchange
        -------------------------------------------------------------