June 9, 1994

		Weekly Earthquake Report for Southern California
		------------------------------------------------
		                June 2 - 8, 1994

	Prepared by:  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 818-395-6326.
	For daily updates, call our Earthquake Information Hotline:
	818-395-6977.

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

	This week's Report covers the time period from midnight Thursday
	morning, June 2, Pacific Daylight Time, to midnight Wednesday
	night, June 8, Pacific Daylight Time.  We recorded 372 earthquakes
	this week.
		The seismicity this week was "more of the same".  The
	largest quake was one of the three Northridge aftershocks that
	were felt, a M3.1 on Sunday evening.  The other two were: a M3.0
	on Saturday afternoon, near Newhall, and a M2.9 on Monday morning,
	near San Fernando.
		At least one insomniac in the Inland Empire felt a M2.5,
	near Loma Linda, in the wee hours of Tuesday morning.
		The most scientifically interesting event to be felt in
	the area this week actually occurred in Bolivia!  Yes, Bolivia.
	At 5:33 pm PDT on Wednesday (00:33 GMT on June 9), a large quake
	(body wave magnitude 7.8, moment magnitude 8.2) occurred there, at
	600 km depth.  According to Dr. Kanamori (Director of the Seismo-
	logical Laboratory), it was the largest deep-focus earthquake this
	century.  Deep focus earthquakes tend to not cause much damage,
	since no place on the Earth's surface is near the rupture, but they
	tend to be felt over a very wide area.  In Wednesday's case, the
	National Earthquake Information Service received calls from many
	areas of the United States, and the quake was felt by at least one
	seismologist at Caltech.  For further information about this
	unusual occurrance, contact the National Earthquake Information
	Service at 303-273-8500.
		The table lists the quakes 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 Daylight
	Time listed.

	Table 1
	-------
	Date  Time      N Lat.   W Long.   Mag  
	-------------------------------------------------------------
         6/2   4:10 am  34 21.2  118 39.3  2.2  6 mi. NNE of Simi Valley
         6/2   4:34 am  34 21.2  118 33.0  2.2  2 mi. SW of Newhall
         6/2   7:12 am  34 18.8  118 27.3  2.0  2 mi. NNW of San Fernando
         6/2   9:16 am  34 23.3  116 28.0  2.2  18 mi. N of Yucca Valley
         6/2   9:22 am  34 23.3  116 28.0  2.5  	"
         6/2   9:31 am  34 23.2  116 28.3  2.1  	"
         6/2   9:34 am  34 23.4  116 28.2  2.1  	"
         6/2  10:29 am  34 23.3  116 28.1  2.4  	"
         6/2  12:12 pm  34 56.3  116 35.9  2.0  24 mi. E of Barstow
         6/2  12:26 pm  34 18.6  118 36.3  2.1  6 mi. NW of Northridge
         6/2   6:37 pm  34 16.3  118 27.9  2.1  1 mi. WSW of San Fernando
         6/2   8:56 pm  33  1.1  118 16.4  2.4  14 mi. NNE of SE tip of San 
						Clemente Is.
         6/2  10:48 pm  33 52.4  119 22.5  2.0  13 mi. SE of Santa Cruz Is. 
         6/2  11:12 pm  33 57.2  116 21.8  2.0  7 mi. E of Desert Hot 
						Springs
         6/2  11:14 pm  34 17.3  118 37.1  2.7  6 mi. N of Canoga Park
         6/3   1:04 am  34 33.7  116 31.5  2.2  25 mi. ENE of Lucerne Valley
         6/3   2:41 am  34  1.8  116 21.0  2.1  8 mi. SE of Yucca Valley
         6/3   5:47 am  34 16.1  116 42.5  2.2  8 mi. E of Big Bear City
         6/3   9:56 am  34 20.7  116 28.0  2.1  15 mi. N of Yucca Valley
         6/3  10:23 am  34 24.1  116 27.7  2.2  19 mi. N of Yucca Valley
         6/3  10:42 am  33 57.8  116 19.3  2.0  10 mi. E of Desert Hot 
						Springs
         6/3   1:18 pm  34 28.0  116 30.4  2.3  24 mi. N of Yucca Valley
         6/3   2:42 pm  35  4.8  118 51.1  2.0  7 mi. NE of the I5/99 inter-
						change         
         6/3   8:36 pm  32 53.1  116 15.9  2.3  19 mi. SSW of Ocotillo Wells
         6/3  10:50 pm  36 49.1  118  8.6  2.8  3 mi. ENE of Independence
         6/3  11:56 pm  36 49.4  118  8.2  2.2  	"
         6/4   1:28 am  36 49.4  118  9.1  2.0  	"
         6/4   1:46 am  34 23.4  116 27.5  2.0  18 mi. N of Yucca Valley
         6/4   3:34 am  34 25.7  116 28.5  2.0  21 mi. N of Yucca Valley
         6/4   4:20 am  34 23.5  116 27.8  2.1  18 mi. N of Yucca Valley
         6/4   9:43 am  33 58.6  116 38.2  2.5  7 mi. W of Desert Hot Springs
         6/4   3:38 pm  34 35.7  116 37.3  2.0  21 mi. ENE of Lucerne Valley
         6/4   4:31 pm  34 21.0  118 34.7  3.0  3 mi. SW of Newhall; FELT
         6/4   5:43 pm  34 21.1  118 34.5  2.0  	"
         6/4   7:21 pm  34 37.7  116 39.2  2.1  21 mi. NE of Lucerne Valley
         6/4   8:21 pm  35 48.6  118 18.3  2.1  15 mi. NE of the town of 
						Lake Isabella
         6/5  12:17 am  36  3.6  117 34.1  2.1  20 mi. SSW of Panamint 
						Springs
         6/5   1:59 pm  34 18.9  118 36.8  2.0  5 mi. ENE of Simi Valley
         6/5   2:10 pm  33 59.8  119 13.0  2.0  10 mi. S of Port Hueneme
         6/5   4:00 pm  34 22.8  118 35.2  2.2  3 mi. S of Magic Mtn.
         6/5   4:32 pm  34 22.0  118 36.0  2.0  	"
         6/5   5:43 pm  34 37.4  116 34.5  2.6  24 mi. ENE of Lucerne Valley
         6/5   6:27 pm  34 19.3  118 36.9  2.2  6 mi. ENE of Simi Valley
         6/5   6:42 pm  34 19.3  118 37.1  2.3  	"
         6/5   9:18 pm  33 15.0  115 39.5  2.5  8 mi. SSE of Bombay Beach
         6/5  10:14 pm  34 16.3  118 35.8  3.1  4 mi. NW of Northridge; FELT
         6/5  10:31 pm  33 54.5  116 17.7  2.1  14 mi. NNW of Indio
         6/6   2:09 am  32  7.0  115 48.2  2.6  42 mi. SSW of Calexico
         6/6   6:24 am  34 22.3  118 37.3  2.2  4 mi. SSW of Magic Mtn.
         6/6   8:31 am  34 17.2  118 29.5  2.9  3 mi. W of San Fernando; FELT
         6/6  10:34 am  33 59.8  118 23.4  2.1  1 mi. WSW of Baldwin Hills
         6/6   3:16 pm  34 29.3  116 30.4  2.1  25 mi. N of Yucca Valley
         6/6   7:12 pm  34 21.4  116 27.9  2.1  16 mi. N of Yucca Valley
         6/6   7:13 pm  34 22.1  116 27.9  2.3  	"
         6/6  10:14 pm  34  5.9  116 23.9  2.5  2 mi. ESE of Yucca Valley
         6/7  12:36 am  34 15.8  118 29.6  2.1  2 mi. NE of Northridge
         6/7   2:51 am  34  2.8  117 15.9  2.5  2 mi. ESE of the I10/I215 
						interchange, Loma Linda; FELT   
         6/7   5:56 am  34 17.5  118 37.4  2.1  4 mi. E of Simi Valley
         6/7  10:32 am  35 18.3  118 33.1  2.0  13 mi. NNW of Tehachapi
         6/7   1:57 pm  34 56.2  116 46.8  2.1  14 mi. ENE of Barstow
         6/7   3:46 pm  34 17.2  118 34.0  2.3  3 mi. NNW of Northridge
         6/7   4:57 pm  34 22.4  118 36.9  2.3  3 mi. SSW of Magic Mtn.
         6/7   6:19 pm  34 17.0  118 30.8  2.6  3 mi. NNE of Northridge
         6/7   6:30 pm  34 16.6  118 30.7  2.0  	"
         6/7   7:17 pm  34 50.9  119 41.4  2.1  24 mi. SW of Taft
         6/7   8:56 pm  33 10.3  115 39.0  2.2  9 mi. N of Westmorland
         6/8  12:12 am  33 34.2  116 43.9  2.0  3 mi. WNW of Anza
         6/8   2:06 pm  34 22.7  116 27.7  2.7  18 mi. N of Yucca Valley
         6/8   4:01 pm  34 15.9  118 29.8  2.6  2 mi. NE of Northridge
         6/8   4:16 pm  34 22.6  116 28.0  2.5  17 mi. N of Yucca Valley
         6/8   9:07 pm  34 34.3  116 17.0  2.1  32 mi. NNE of Yucca Valley
        -------------------------------------------------------------

        Figure 1. A map of southern California showing the earthquakes
        recorded during the past week by the Caltech/USGS Seismic
        Network.  Major faults are marked, as well as the metropolitan
        areas of Los Angeles (L.A.), Palm Springs (P.S.), San Diego
        (S.D.), and Santa Barbara (S.B.).  The circles denote the
	earthquakes, the size of the circle indicating the magnitude.