From    : W6VIO @ W6VIO
To      : QUAKE
Date    : 921217/2120
Msgid   : BN 43497@W6VIO $43497_W6VIO
Subject : S. Cal Weekly Rpt 12/10 - 12/16

                                                December 17, 1992

                Weekly Earthquake Report for Southern California
                ------------------------------------------------
                             December 10 - 16, 1992

        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) 356-6326.

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

        This week's Report covers the time period from midnight Thursday
        morning, December 10, Pacific Standard Time, to midnight Wednesday
        night, December 16, Pacific Standard Time.  Aftershocks of the
        Landers earthquake continue, as they will for several years at
        least.  The map includes a virtually complete set of earthquakes of
        M2.0 or larger, plus many smaller ones that happen to have made
        it through the data processing.  There are 444 in all.
                The phrase for the week is simply "more of the same".
        The largest quake was a M3.9 north of Yucca Valley on Thursday
        afternoon.  The second largest was a M3.7 near Barstow on Saturday
        night.  Both were Landers aftershocks.
                For those interested in the progress of the data processing,
        here is the tally:
                                Processed        Still to do
                                ---------        -----------
                June 28 - 30           860                   541
                July                 2,888                 8,756
                August                 1,571                 6,300
                September         2,024                 3,838
                October                 2,561                 1,709
                November         2,294                 1,173
                December         1,249 so far           668 so far
                                ---------        -----------
                                13,447                22,985

        The numbers in the "still to to" column correspond to on-line
        system triggers, which may contain multiple earthquakes.
        Taking this into account, we easily have 45,000 earthquakes for
        the second half of 1992.  Our normal processing load for a six
        month period is about 5,000.
                The table lists the quakes that were M2.3 or larger.  Times
        are local times; if you want Greenwich Mean Time, add 8 hrs. to
        the Pacific Standard Time listed.

        Table 1
        -------
        Date  Time      N Lat.   W Long.   Mag
        -------------------------------------------------------------
        12/10  4:20 am  34 16.1  116 54.3  2.7  1 mi. N of town of Big Bear
                                                Lake
        12/10  6:39 am  34 18.4  116 26.2  2.5  12 mi. N of Yucca Valley
        12/10  8:13 am  35  0.4  116 56.8  2.3  9 mi. NNE of Barstow
        12/10 10:23 am  34  9.1  116 24.8  3.4  2 mi. NE of Yucca Valley
        12/10 12:35 pm  34 57.8  116 56.0  2.4  7 mi. NE of Barstow
        12/10 12:47 pm  34 16.3  116 24.1  2.9  10 mi. NNE of Yucca Valley
        12/10  4:04 pm  34 36.9  116 37.8  2.8  21 mi. ENE of Lucerne Valley
        12/10  4:45 pm  34 22.5  116 52.4  3.0  6 mi. SE of Lucerne Valley
        12/10  5:38 pm  34 16.3  116 24.1  3.9  10 mi. NNE of Yucca Valley
                                                Felt.
        12/10  5:40 pm  34 16.5  116 23.9  2.9          "
        12/10  5:52 pm  34 16.2  116 24.2  2.7          "
        12/10  9:14 pm  34 21.3  116 56.0  2.5  6 mi. S of Lucerne Valley
        12/10 11:41 pm  35  7.8  116 50.4  2.6  15 mi. S of Goldstone (dry)
                                                Lake
        12/11  3:11 am  34 21.1  116 55.4  2.4  6 mi. S of Lucerne Valley
        12/11  3:11 am  32 36.3  117 20.0  2.7  12 mi. SW of the I5/I8
                                                interch., San Diego
        12/11  4:13 am  33 11.5  115 33.6  2.3  4 mi. SW of Niland
        12/11  4:47 am  33 11.5  115 34.0  2.9          "
        12/11  4:56 am  34 59.1  116 56.8  2.7  7 mi. NNE of Barstow
        12/11  7:39 am  34 21.2  116 53.8  2.7  6 mi. NNW of Big Bear City
        12/11 12:00 pm  34 22.9  116 27.4  2.7  18 mi. N of Yucca Valley
        12/11 12:45 pm  34 22.4  116 52.8  2.3  6 mi. SE of Lucerne Valley
        12/11  1:06 pm  34 16.1  116 24.0  2.8  10 mi. NNE of Yucca Valley
        12/11  1:46 pm  34 22.4  116 52.4  2.3  6 mi. SE of Lucerne Valley
        12/11  4:31 pm  34 21.4  116 53.7  3.4  6 mi. SSE of Lucerne Valley
                                                Felt.
        12/11  5:08 pm  34 11.2  116 47.0  2.7  6 mi. NNE of Mt. San Gorgonio
        12/11  7:25 pm  33 57.2  116 23.3  2.4  6 mi. E of Desert Hot Springs
        12/11  8:20 pm  35 56.4  117 40.9  2.3  16 mi. ESE of Coso Junction
        12/11  9:36 pm  34 16.5  116 24.3  3.1  11 mi. NNE of Yucca Valley
                                                Felt.
        12/12 12:07 am  34 22.4  116 54.3  2.7  5 mi. SSE of Lucerne Valley
        12/12  6:38 am  35  0.4  116 57.8  2.7  8 mi. NNE of Barstow
        12/12  7:10 am  32 59.7  117 48.0  2.3  27 mi. WSW of Oceanside
        12/12  7:28 am  34 38.2  116 30.7  2.3  28 mi. ENE of Lucerne Valley
        12/12 11:40 am  34 36.4  116 38.2  2.4  20 mi. ENE of Lucerne Valley
        12/12  3:59 pm  34 22.2  116 52.7  2.6  6 mi. SE of Lucerne Valley
        12/12  4:46 pm  34 30.9  116 31.1  2.3  27 mi. N of Yucca Valley
        12/12  8:14 pm  34 58.9  116 56.8  3.7  7 mi. NE of Barstow
                                                Felt.
        12/12  9:30 pm  34  0.9  116 20.6  3.1  9 mi. SE of Yucca Valley
        12/12 11:15 pm  34  0.0  116 20.3  2.5          "
        12/12 11:31 pm  36 25.5  117 53.6  2.6  11 mi. NNE of Olancha
        12/13  3:47 am  34 21.8  116 52.4  2.3  6 mi. N of Big Bear City
        12/13  3:48 am  34 56.7  116 55.8  2.4  6 mi. NE of Barstow
        12/13  4:12 am  34 58.7  116 56.7  2.3          "
        12/13  4:32 am  34  7.3  116 23.9  2.6  2 mi. E of Yucca Valley
        12/13  6:15 am  34 21.1  116 53.8  2.3  6 mi. NNW of Big Bear City
        12/13 11:14 am  34 34.6  116 35.2  2.4  22 mi. ENE of Lucerne Valley
        12/13 11:15 am  34 29.2  116 31.2  2.7  25 mi. N of Yucca Valley
        12/13  1:10 pm  33 58.7  116 18.8  2.9  10 mi. E of Desert Hot
                                                Springs
        12/13  1:57 pm  34 17.9  116 28.1  2.3  12 mi. N of Yucca Valley
        12/13  4:02 pm  34 32.6  116 33.3  2.5  23 mi. ENE of Lucerne Valley
        12/13  5:15 pm  34 18.5  116 25.0  3.0  13 mi. N of Yucca Valley
        12/13  5:21 pm  34 37.7  116 33.5  2.4  25 mi. ENE of Lucerne Valley
        12/13  6:13 pm  34 37.8  116 35.5  2.3          "
        12/13  7:23 pm  34 12.9  116 27.0  2.3  6 mi. N of Yucca Valley
        12/14  1:58 am  34 57.2  116 56.6  3.2  6 mi. NE of Barstow
        12/14  4:46 am  34 32.5  116 32.7  2.3  23 mi. ENE of Lucerne Valley
        12/14  5:19 am  34 57.2  116 55.6  2.3  7 mi. NE of Barstow
        12/14  6:08 am  34 55.7  116 42.8  2.4  17 mi. E of Barstow
        12/14  9:15 am  32 33.2  115 52.3  2.3  14 mi. SSE of Ocotillo
        12/14  9:35 am  34 20.2  116 54.6  2.6  5 mi. NNW of Big Bear City
        12/14  9:46 am  34 20.4  116 54.7  3.0  6 mi. NNW of Big Bear City
        12/14  9:57 am  34  4.2  116 23.0  2.6  4 mi. SE of Yucca Valley
        12/14 11:52 am  34 58.5  116 47.9  3.2  14 mi. ENE of Barstow
        12/14  1:39 pm  34 16.5  116 44.5  2.3  6 mi. E of Big Bear City
        12/14  2:12 pm  34 29.8  116 30.5  2.3  26 mi. N of Yucca Valley
        12/14  2:42 pm  35  0.1  116 57.0  2.4  8 mi. NNE of Barstow
        12/14  2:49 pm  34 23.7  116 27.6  2.3  19 mi. N of Yucca Valley
        12/14  4:52 pm  35  4.0  116 59.8  2.3  12 mi. N of Barstow
        12/14 10:48 pm  34 15.7  116 44.1  3.0  6 mi. E of Big Bear City
        12/15  2:17 am  34 12.9  116 50.4  2.4  3 mi. SSE of Big Bear City
        12/15  6:26 am  34 58.2  116 56.5  2.3  7 mi. NE of Barstow
        12/15  6:53 am  34 38.0  116 40.0  2.4  20 mi. NE of Lucerne Valley
        12/15 12:07 pm  34 20.1  116 53.2  3.2  5 mi. NNW of Big Bear City
        12/15  3:11 pm  34  3.1  116 23.5  2.8  5 mi. SE of Yucca Valley
        12/15  4:18 pm  34 21.0  116 53.4  2.4  6 mi. NNW of Big Bear City
        12/15  8:42 pm  34  1.1  116 18.7  2.4  10 mi. SE of Yucca Valley
        12/15  9:18 pm  34 21.2  116 53.3  2.7  6 mi. NNW of Big Bear City
        12/16  1:55 am  34 37.5  116 32.7  3.3  25 mi. ENE of Lucerne Valley
        12/16  1:57 am  34 37.3  116 32.8  2.5          "
        12/16  8:25 am  33 56.1  118 35.2  2.5  8 mi. SW of Santa Monica
        12/16 11:58 am  34 37.3  116 34.6  2.3  24 mi. ENE of Lucerne Valley
        12/16  2:03 pm  32 53.8  115 31.9  2.3  4 mi. S of Brawley
        12/16  2:31 pm  34 59.4  116 57.0  3.3  8 mi. NNE of Barstow
        12/16  4:07 pm  34 59.3  116 56.7  2.3          "
        12/16  6:53 pm  34 38.2  116 40.0  2.5  20 mi. NE of Lucerne Valley
        12/16  8:33 pm  35 40.9  117 37.2  2.3  4 mi. NNE of Ridgecrest

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