Northern California Seismicity Report for the week ending Oct 04, 2001

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

• 15 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 3.1, 5 miles W of Toms Place, CA at 05:39 PM UTC Monday, 10 01, 2001 (10:39 AM PDT Monday, Oct 01, 2001).

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

The largest event to occur this week in this region was a microearthquake of magnitude 2.5, 1 miles S of Saratoga, CA at 12:59 AM UTC Tuesday, 10 02, 2001 (05:59 PM PDT Monday, Oct 01, 2001).

• 13 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, 5 miles W of Toms Place, CA at 05:39 PM UTC Monday, 10 01, 2001 (10:39 AM PDT Monday, Oct 01, 2001).

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

2001 SEP 27 1452 42.48 36 34.48 121 10.19  5.79 50 .06  .1  .3 PIN    2.2D  36  2 NN
2001 SEP 28 0109 27.34 37 17.17 119 23.28 33.06 24 .06  .3  .6 KAI    2.5D 160 21 NN
2001 SEP 28 0858 40.14 38 46.42 122 44.46  1.10 21 .05  .2  .4 GEY    2.1D  33  2 NN
2001 SEP 28 2356 17.32 41 16.47 123 59.49 26.33 11 .05  .5  .8 DEL    3.0D 176 13 AN
2001 SEP 29 1333 34.50 38 49.85 122 45.48  1.63 22 .08  .2  .6 GEY    2.1D  48  4 NN
 
2001 OCT  1 0557 13.61 40 58.43 121 41.94  5.02 10 .11  .4 9.8 SHA  - 2.1D  79 29 NN
2001 OCT  1 1523  1.87 38 24.07 122 13.11  6.41 39 .27  .2  .6 GVL    2.2D  74  5 NN
2001 OCT  1 1739 35.90 37 32.84 118 46.70 11.18 32 .06  .3  .6 MOR    3.1D  81  2 NN
2001 OCT  2 0059 23.94 37 14.62 122  1.58  9.41 63 .07  .1  .3 BLM    2.5D  67  5 NN
2001 OCT  2 0424  0.30 38 49.18 122 48.28  4.70 27 .05  .2  .4 GEY    2.2D  36  2 NN
 
2001 OCT  2 0807 26.79 38 45.28 122 43.48  2.87 25 .05  .2  .3 GEY    2.1D  48  2 NN
2001 OCT  2 1637 42.29 39 15.74 123 26.82  6.03 27 .06  .1  .8 PAR    2.3D  83 14 NN
2001 OCT  2 1921 48.76 37 32.86 118 46.73 11.26 33 .06  .3  .5 MOR    3.1L  82  2 NN
2001 OCT  2 2211 24.53 37 32.81 118 46.76 11.23 33 .06  .2  .5 MOR    2.6D  84  2 NN
2001 OCT  3 1436 51.72 38 25.16 122 14.78  6.62 45 .21  .2  .4 GVL    2.3D  70  2 NN