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                                        October 13, 1994

        Weekly Earthquake Report for Southern California
        ------------------------------------------------
                      October 6 - 12, 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, October 6, Pacific Daylight Time, to midnight Wednesday
night, October 12, Pacific Daylight Time.  We recorded 307
earthquakes of M1.0 or larger this week.
        Although the total number of events was up slightly from
last week (but still within the expected range), most of this
week's quakes were small.  Only two were felt, neither of which
was an aftershock.  The largest was a M3.9 in the Ocotillo Wells
area south of Borrego Springs.  This quake occurred on Saturday
night, and we got a few calls.  A much smaller quake (M2.8)
occurred in the Idyllwild area on Tuesday afternoon.  It was felt
in Idyllwild.
        Aside from these, not much of note occurred. Our two
aftershock sequences, namely Northridge and Landers/Big Bear,
still dominate the map.
        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 Daylight
Time listed.

Table 1
-------
Date  Time      N Lat.   W Long.   Mag
-------------------------------------------------------------
10/6   4:31 am  33 21.1  116 21.8  2.5  6 mi. N of Borrego Springs
10/6   5:25 am  34 43.5  120 44.2  2.6  10 mi. NNW of Pt. Arguello
10/6   8:04 am  34 42.8  120 44.1  2.8          "
10/6   4:00 pm  34  1.6  117 10.8  2.1  1 mi. S of Redlands
10/6   7:32 pm  34 47.0  116 17.9  2.5  35 mi. SSW of Baker
10/6   7:33 pm  34 22.3  118 39.6  2.4  5 mi. SW of Magic Mtn.
10/6   7:33 pm  34 22.3  118 39.6  2.0          "
10/6   9:01 pm  34 47.3  116 18.1  2.5  35 mi. SSW of Baker
10/6   9:01 pm  34 39.3  116 30.1  2.5  29 mi. ENE of Lucerne Valley
10/6  11:58 pm  34 18.5  119 16.8  2.6  2 mi. NNE of Ventura
10/7   3:50 am  34 12.3  118 35.5  2.1  Under Canoga Park
10/7   6:13 am  34 36.6  116 37.5  2.5  21 mi. ENE of Lucerne Valley
10/7   9:14 am  34 59.0  116 56.8  2.7  7 mi. NNE of Barstow
10/7  12:14 pm  34 46.5  116 17.8  2.0  36 mi. SSW of Baker
10/7   1:57 pm  35  0.1  116 57.5  2.5  8 mi. NNE of Barstow
10/7   4:20 pm  34 20.9  116 28.7  2.4  15 mi. N of Yucca Valley
10/8   5:32 am  33 24.0  116 22.8  2.1  10 mi. N of Borrego Springs
10/8   5:49 am  35 48.7  117 57.4  2.7  16 mi. S of Coso Junction
10/8  11:46 am  33 30.2  116 58.0  2.0  11 mi. NNW of Palomar
                                        Observatory
10/8  12:18 pm  34 45.4  116 17.7  2.1  37 mi. SSW of Baker
10/8  12:40 pm  36  6.1  119 57.2  2.3  22 mi. E of Coalinga
10/8  12:49 pm  36  6.0  119 58.1  2.7          "
10/8   2:20 pm  33 44.1  118  2.6  2.0  3 mi. E of Seal Beach
10/8   2:38 pm  34 46.8  116 17.9  2.4  35 mi. SSW of Baker
10/8   9:10 pm  33 13.8  116  6.0  3.9  6 mi. NNE of Ocotillo Wells
                                        FELT
10/8   9:41 pm  34  9.9  116 26.3  2.0  3 mi. N of Yucca Valley
10/8   9:48 pm  34 27.1  116 30.1  2.2  23 mi. N of Yucca Valley
10/8  11:34 pm  33 41.8  117 24.9  2.4  3 mi. NW of Lake Elsinore
10/8  11:49 pm  35 33.0  118 25.6  2.2  6 mi. SSE of the town of
                                        Lake Isabella
10/9   2:56 am  32 40.3  115 54.7  2.4  6 mi. SE of Ocotillo
10/9   7:13 am  34 19.8  116 38.0  2.1  13 mi. ENE of Big Bear City
10/9   7:42 am  35 37.2  116  1.5  2.0  24 mi. N of Baker
10/9  12:20 pm  32 19.4  115 13.7  3.1  Baja, 28 mi. SSE of Calexico
10/9   5:39 pm  34 14.8  118 29.0  2.0  2 mi. ENE of Northridge
10/10 12:02 am  33 55.7  116 19.6  2.7  10 mi. ESE of Desert Hot
                                        Springs
10/10  5:01 am  34 18.0  118 25.5  2.0  1 mi. NNE of San Fernando
10/10  9:46 am  35 56.4  118 23.0  2.0  21 mi. NNE of the town of
                                        Lake Isabella
10/10  6:51 pm  36 12.7  120 47.6  2.5  24 mi. WNW of Coalinga
10/10 10:15 pm  34 21.9  116 28.1  2.0  17 mi. N of Yucca Valley
10/10 10:51 pm  34  2.3  117 15.4  2.2  Loma Linda, 2 mi. SE of the
                                        I10/I215 interchange
10/10 11:58 pm  34 47.5  118 55.4  2.6  2 mi. SSE of Frazier Park
10/11  1:28 am  34 11.8  116 48.4  2.2  5 mi. SSE of Big Bear City
10/11  5:35 am  33 59.6  116 16.4  2.1  13 mi. SE of Yucca Valley
10/11 12:03 pm  34 55.1  116 22.1  2.1  29 mi. SW of Baker
10/11 12:20 pm  34 46.9  116 18.3  2.3  35 mi. SSW of Baker
10/11  4:05 pm  36  0.6  117 49.1  2.7  7 mi. ESE of Coso Junction
10/11  4:14 pm  33 40.4  116 43.3  2.8  4 mi. S of Idyllwild; FELT
10/11  4:15 pm  33 40.4  116 43.0  2.0          "
10/11  4:22 pm  33 40.6  116 43.3  2.1          "
10/11  7:33 pm  34 55.3  116 21.8  2.2  28 mi. SW of Baker
10/11  8:38 pm  34 47.5  116 18.0  2.9  35 mi. SSW of Baker
10/12  7:22 am  34 58.3  116 34.7  2.3  25 mi. ENE of Barstow
10/12 11:33 am  34 16.4  118 32.4  2.0  2 mi. N of Northridge
10/12 11:39 am  34 45.7  116 17.5  2.2  36 mi. SSW of Baker
10/12  1:18 pm  34 28.1  116 31.0  2.0  24 mi. N of Yucca Valley
10/12  2:13 pm  34 28.4  116 29.9  2.2          "
10/12  3:24 pm  34 58.2  116 56.7  2.3  7 mi. NE of Barstow
10/12  8:46 pm  34 34.4  116 34.8  2.0  22 mi. ENE of Lucerne Valley
10/12 10:36 pm  34 17.5  118 27.8  2.5  1 mi. WNW of San Fernando
10/12 11:17 pm  34 30.5  116 30.8  2.4  27 mi. N 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.

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

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