Northern California Seismicity Report for the week ending Feb 07, 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

• 19 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 3.2, 9 miles W of Eureka, CA at 12:03 PM UTC Monday, 02 04, 2002 (04:03 AM PST Monday, Feb 04, 2002).

• 13 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, 3 miles WSW of Cupertino, CA at 02:00 AM UTC Saturday, 02 02, 2002 (06:00 PM PST Friday, Feb 01, 2002).

• 3 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 2.0, 8 miles WSW of Toms Place, CA at 08:01 AM UTC Thursday, 01 31, 2002 (12:01 AM PST Thursday, Jan 31, 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 JAN 31 0242 38.37 40 25.28 124 38.98 17.94 41 .11  .7  .4 MEN    2.8D 233 35 NN
2002 JAN 31 0559 20.18 36 33.80 121  6.85  3.65 46 .09  .1  .4 BVL    2.4D  52  7 NN
2002 JAN 31 0704 22.21 36 25.88 120 59.46  2.35 43 .07  .2  .8 BIT    2.3D  66 12 NN
2002 JAN 31 0801 11.78 37 32.19 118 49.77  2.15 20 .06  .3 3.3 MOR    2.0D 176  9 WW
2002 JAN 31 0915 45.46 40 44.44 122 31.30 20.02 10 .16  .7  .8 SHA    2.9D 119  9 WW
 
2002 JAN 31 0920 10.72 36 25.81 120 59.19  1.77 27 .08  .2 1.2 BIT    2.2D  79 12 WW
2002 JAN 31 1526 37.68 37 31.03 119 25.43 23.49 26 .05  .5  .9 KAI    2.1D 190 27 NN
2002 FEB  1 0834 28.24 39 16.44 123 11.41  8.57 36 .06  .2  .7 MAA    2.7D  42 12 NN
2002 FEB  1 1300 16.35 39 16.48 123 11.26  8.37 37 .06  .1  .6 MAA    2.5D  42 12 NN
2002 FEB  2 0200 46.68 37 17.78 122  5.04  7.23 82 .10  .1  .2 BLM    2.4D  26  3 NN
 
2002 FEB  2 0339 52.73 38 47.40 122 46.79  3.67 25 .04  .2  .5 GEY    2.1D  39  2 WW
2002 FEB  2 1913  9.06 37 31.13 121 53.40  6.22 68 .07  .1  .3 MIS    2.2D  22  1 NN
2002 FEB  4 0032 38.60 40 44.56 122 31.71 18.24 14 .20  .9  .6 SHA    3.0D  79  9 WW
2002 FEB  4 0155 20.29 38 47.98 122 47.88  2.21 26 .04  .2  .3 GEY    2.4D  38  1 WW
2002 FEB  4 1203 47.01 40 48.18 124 19.90 23.78 24 .11  .5 3.7 EUR    3.2L 182 36 WW
 
2002 FEB  4 1346 30.80 40 48.30 124 20.16 24.07 11 .08  .910.3 EUR  - 2.4D 201 47 WW
2002 FEB  4 1438 57.53 39  4.34 120 53.91  2.11 22 .17  .4 3.8 AUB    3.0D  95 10 WW
2002 FEB  4 1836 35.39 40 44.40 122 31.01 19.36 10 .06  .3  .4 SHA    3.0D  80  9 NN
2002 FEB  6 0126 28.86 37 32.35 121 55.24  9.53 54 .08  .1  .4 MIS    2.2D  37  3 WW