Northern California Seismicity Report for the week ending Feb 14, 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

• 13 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 an earthquake of magnitude 3.1, 6 miles SSE of San Juan Bautista, CA at 01:51 AM UTC Sunday, 02 10, 2002 (05:51 PM PST Saturday, Feb 09, 2002).

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

The largest event to occur this week in this region was an earthquake of magnitude 3.1, 6 miles SSE of San Juan Bautista, CA at 01:51 AM UTC Sunday, 02 10, 2002 (05:51 PM PST Saturday, Feb 09, 2002).

• 8 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 1.8, 11 miles SW of Toms Place, CA at 02:04 PM UTC Friday, 02 08, 2002 (06:04 AM PST Friday, Feb 08, 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 FEB  7 0450 22.66 38 47.62 122 27.41 10.21 37 .11  .2  .4 GVL    2.4D  63  2 NN
2002 FEB  7 1557 40.05 36  1.67 120 34.93  5.77 42 .07  .2  .3 SLA    2.8D  58  6 WW
2002 FEB  7 2051 36.65 41 17.29 121 52.03  9.24  8 .09 1.1 4.7 MOD    2.2D 127  7 NN
2002 FEB  7 2259 57.07 36 37.22 121 13.48  4.72 46 .05  .1  .3 PIN    2.2D  55  6 NN
2002 FEB  7 2335 54.97 37 23.78 118 34.92  7.71 26 .07  .2  .5 RVL    2.4D 107  5 NN
 
2002 FEB 10 0151  5.95 36 46.01 121 28.37  6.75 64 .11  .2  .4 SJB    3.1L  34  6 NN
2002 FEB 10 0259 35.69 39  2.73 123  7.50  6.53 34 .07  .1  .5 MAA    2.5D  32  9 NN
2002 FEB 10 1722 59.08 37 24.02 118 58.04 18.38 36 .07  .2  .7 SIL    2.0D  98 19 NN
2002 FEB 10 2057 48.84 37 23.03 118 54.96  7.66  9 .02  .4 3.5 SIL    2.0D 165 21 NN
2002 FEB 10 2325 59.05 38 47.70 122 46.64  2.76 30 .05  .1  .3 GEY    2.1D  39  2 NN
 
2002 FEB 11 0450 58.05 38 46.50 122 44.47  4.27 38 .07  .1  .3 GEY    2.4D  33  2 NN
2002 FEB 12 0953 57.28 38 49.33 122 48.07  5.48 35 .05  .1  .3 GEY    2.4D  35  2 NN
2002 FEB 13 1403 37.71 38 47.04 122 43.52  1.85 15 .07  .2  .4 GEY    2.0D 100  1 WW