Northern California Seismicity Report for the week ending Nov 01, 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

• 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 3.1, 4 miles ESE of The Geysers, CA at 07:38 PM UTC Tuesday, 10 30, 2001 (11:38 AM PST Tuesday, Oct 30, 2001).

• 8 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 2.4, 2 miles SE of Pacifica, CA at 05:07 AM UTC Tuesday, 10 30, 2001 (09:07 PM PST Monday, Oct 29, 2001).

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

The largest event to occur this week in this region was a microearthquake of magnitude 2.6, 13 miles SW of Toms Place, CA at 04:55 PM UTC Sunday, 10 28, 2001 (08:55 AM PST Sunday, Oct 28, 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 OCT 25 0054 30.68 36 10.58 120 23.23 19.04 10 .11 2.9 3.3 COA  # 2.0D 192 22 NN
2001 OCT 25 0333 20.48 37 32.41 118 25.50  6.54 31 .07  .3  .6 CHV    3.0D  96  2 NN
2001 OCT 25 1247 40.80 38 48.26 122 47.99  2.27 25 .04  .2  .3 GEY    2.3D  38  1 WW
2001 OCT 26 0531 27.88 38 48.47 122 48.82  4.85 37 .04  .1  .3 GEY    2.3D  32  2 NN
2001 OCT 27 0603 11.17 36 36.40 121 12.65  6.07 51 .06  .1  .3 PIN    2.0D  32  4 NN
 
2001 OCT 27 0620 25.64 37 28.26 122 16.02  4.55 49 .09  .1  .3 BLM    2.1D  70  4 NN
2001 OCT 27 0957 49.18 38 49.42 122 48.45  2.68 27 .07  .2 1.5 GEY    2.5D  51  7 WW
2001 OCT 27 2103 12.87 36 35.25 121  7.43  7.31 46 .07  .1  .3 BVL    2.3D  44  6 NN
2001 OCT 27 2239  9.52 38 48.53 122 44.98  1.12 24 .04  .1  .4 GEY    2.1D  54  4 WW
2001 OCT 28 1241 40.21 36 22.59 120 25.00 10.23 36 .10  .2  .2 COA    2.3D 103  6 NN
 
2001 OCT 28 1328  1.70 40 29.57 123 50.93 26.05 23 .10  .3  .6 EUR    2.5D  81  8 NN
2001 OCT 28 1655 38.13 37 26.23 118 51.09  7.64 32 .07  .4 1.4 MOR    2.6D 142 13 WW
2001 OCT 29 0244  2.90 39 47.93 123 12.42  4.82 24 .09  .2  .7 BAR    2.0D  49 10 NN
2001 OCT 30 0233 18.28 36 32.30 120 36.63 17.26 81 .23  .2  .5 CRV    2.5D  85 26 NN
2001 OCT 30 0507 39.89 37 35.59 122 27.36  8.17 45 .06  .2  .3 SFP    2.4D 101  3 WW
 
2001 OCT 30 0958 25.63 40 13.87 124 17.70 23.66 15 .12 1.2  .8 MEN    2.6D 194  2 NN
2001 OCT 30 1938 34.80 38 46.25 122 43.90  2.51 36 .11  .2  .4 GEY    3.1L  36  1 WW
2001 OCT 30 2107 43.18 38 50.29 122 46.63  2.30 33 .04  .1 1.0 GEY    3.0D  42  7 WW
2001 OCT 31 0146  1.51 35 47.90 120 20.84 10.64 38 .06  .2  .3 GOL    2.9D  55  4 WW
2001 OCT 31 1210 59.04 36 49.21 121 32.44  6.49 39 .08  .2  .3 SJB    2.2D  55  3 WW