Northern California Seismicity Report for the week ending Oct 24, 2002

This report provides a brief summary of earthquake activity recorded by the U.S. Geological Survey Northern California Seismic Network in Menlo Park and the University of California Berkeley Seismological Laboratory. It is automatically generated each Wednesday shortly after midnight, Universal time (UT). UT (ie., Greenwich Mean Time) is 8 hours ahead of PST or 7 hours ahead of PDT.

Because it is not possible to review all of the earthquakes before this report is generated, it may contain errors. Please report errors or provide suggestions and comments to ncsn@andreas.wr.usgs.gov

The report no longer includes maps showing earthquakes for the entire US or world. Those maps are now available from the U.S.G.S. National Earthquake Information Center. In addition, all earthquake data can be retrieved from the Northern California Earthquake Data Center.

Please note that some of the earthquake data in this report have been reviewed by seismic analysts. Consequently, the parameters that describe the hypocenter, magnitude, origin time, and solution statistics may differ slightly from the information contained on the real-time earthquake web page. The differences reflect revised arrival times at seismic stations and the analysts' decisions to include or exclude information from seismic stations.

The minimum magnitude ( M) values in the following bullets reflect the smallest earthquake which the network can routinely record within the region. During the previous seven-day period ending at midnight (UT) Wednesday, our seismic networks recorded

• 20 M >2.0 earthquakes in Northern and Central California (map) (within dashed polygon of figure).

The largest event to occur this week in this region was a minor earthquake of magnitude 3.8, 2 miles S of San Juan Bautista, CA at 01:34 PM UTC Wednesday, 10 23, 2002 (06:34 AM PDT Wednesday, Oct 23, 2002).

• 15 M >1.2 earthquakes in the San Francisco Bay area (map).

The largest event to occur this week in this region was a minor earthquake of magnitude 3.8, 2 miles S of San Juan Bautista, CA at 01:34 PM UTC Wednesday, 10 23, 2002 (06:34 AM PDT Wednesday, Oct 23, 2002).

• 5 M >1.2 earthquakes in the Long Valley region (map).

The largest event to occur this week in this region was a minor earthquake of magnitude 3.1, 7 miles W of Toms Place, CA at 11:56 PM UTC Tuesday, 10 22, 2002 (04:56 PM PDT Tuesday, Oct 22, 2002).

The following table provides a listing of all M >2 earthquakes that occurred this week. An explanation of the entries in the table is available.

---ORIGIN TIME (UT)--- -LAT N-- --LON W-- DEPTH  N RMS ERH ERZ LOC    PREF AZ MIN S. PAGE   1
YEAR MON DA HRMN  SEC  DEG MIN  DEG  MIN    KM  RD SEC  KM  KM REMKS  MAG  GAP DS PF

2002 OCT 17 0656 59.67 38 49.63 122 45.96  3.18 21 .04  .2  .5 GEY    2.0D  47  3 WW
2002 OCT 17 1011 41.92 36 35.96 121 12.43  8.68 44 .06  .2  .4 PIN    2.3D  39  3 WW
2002 OCT 17 1310 36.59 39 32.88 123 33.08  3.84 19 .12  .4 1.3 MAA    2.0D 133 40 NN
2002 OCT 19 2006 15.41 36  1.24 120 57.81  8.44 29 .05  .2  .6 ROB    2.0D  49  7 WW
2002 OCT 20 0800 52.34 40 15.02 122  7.13  6.50 14 .03  .7  .5 SHA    2.3D 166  5 WW
 
2002 OCT 20 1045 31.01 36 50.74 121 34.44  5.21 71 .12  .2  .3 SJB    3.1D  45  2 WW
2002 OCT 20 1224 17.23 36 50.98 121 34.77  4.86 63 .13  .2  .3 SJB    2.9D  47  2 WW
2002 OCT 20 2137 37.44 36 56.62 121 35.83  5.83 63 .11  .1  .3 SAR    2.2D  35  2 NN
2002 OCT 21 0219  6.17 36 44.08 121 24.11  6.19 56 .09  .1  .3 SJB    2.4D  32  2 NN
2002 OCT 21 0438 59.79 36 50.25 121 34.25  7.74 50 .09  .2  .3 SJB    2.1D  43  2 WW
 
2002 OCT 21 1157 34.50 38 51.25 122 50.52  1.84  8 .02  .4  .8 GEY    2.4D  87  3 WW
2002 OCT 21 1158 58.88 38 51.26 122 50.34  1.75 24 .04  .2  .4 GEY    2.6D  56  3 WW
2002 OCT 22 1954  5.30 36 46.15 121 16.87  7.73 41 .07  .2  .3 PAI    2.2D  78  5 WW
2002 OCT 22 2114 31.68 37 44.98 122  9.17  6.80 46 .17  .2  .5 HAY    2.1D  37  4 WW
2002 OCT 22 2356 14.28 37 32.53 118 48.72  9.11 42 .07  .3  .6 MOR    3.1D 111  9 WW
 
2002 OCT 23 0908 50.65 38 47.62 122 44.08  2.72 28 .06  .2  .4 GEY    2.3D  45  3 WW
2002 OCT 23 1334 32.87 36 48.95 121 31.92  5.30 70 .16  .2  .4 SJB    3.8L  34  3 WW
2002 OCT 23 1419 37.32 36 48.57 121 31.20  5.09 53 .11  .2  .4 SJB    2.9D  52  5 WW
2002 OCT 23 1827 33.21 37 32.46 118 49.04  9.52 33 .08  .3  .7 MOR    2.1D  92  6 WW
2002 OCT 23 2232 47.68 36 48.24 121 30.73  5.23 47 .09  .2  .4 SJB    2.7D  35  6 WW