Northern California Seismicity Report for the week ending Aug 09, 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

• 22 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, 6 miles ENE of Petrolia, CA at 02:59 PM UTC Tuesday, 08 07, 2001 (07:59 AM PDT Tuesday, Aug 07, 2001).

• 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 3.0, 2 miles WSW of San Juan Bautista, CA at 08:31 PM UTC Tuesday, 08 07, 2001 (01:31 PM PDT Tuesday, Aug 07, 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 2.2, 13 miles SW of Toms Place, CA at 11:10 AM UTC Wednesday, 08 08, 2001 (04:10 AM PDT Wednesday, Aug 08, 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 AUG  2 0348 47.90 38 49.17 122 49.29  1.50 17 .03  .2  .4 GEY    2.1D  43  3 NN
2001 AUG  2 0352  3.45 38 48.96 122 49.13  1.16 19 .04  .2  .4 GEY    2.2D  39  2 WW
2001 AUG  2 0921 36.35 38 48.29 122 48.37  1.58 17 .02  .2  .3 GEY    2.3D  45  1 WW
2001 AUG  2 2243 35.92 36 35.08 121 11.24  6.51 37 .07  .2  .5 PIN    2.1D  37  1 WW
2001 AUG  3 0649 20.93 38 48.22 122 46.11  2.63 26 .05  .2  .4 GEY    2.3D  44  2 WW
 
2001 AUG  3 1811  4.46 40 18.56 124 16.14  8.53 11 .04  .3  .4 MEN    2.2D 136  8 NN
2001 AUG  3 1843 18.68 38 30.00 123 19.25  4.12 26 .04  .3  .6 MAR    2.2D 185 14 NN
2001 AUG  4 0258 41.02 35 49.53 121 22.38  4.65 36 .06  .4  .2 SSM    2.0D 182  8 NN
2001 AUG  4 1715 59.57 38 49.92 122 46.81  1.72 17 .04  .2  .4 GEY    2.1D  43  3 WW
2001 AUG  4 1734 17.29 38 49.57 122 46.78  1.54 14 .02  .2  .5 GEY    2.1D  42  2 WW
 
2001 AUG  4 1942 24.03 38 49.44 122 46.84  1.65 19 .04  .2  .4 GEY    2.1D  78  2 WW
2001 AUG  5 0648 55.44 38 57.70 123 22.44  7.66 21 .05  .2  .8 PAR    2.0D  80 16 NN
2001 AUG  6 0823  2.56 36 12.70 120 21.99  9.89 39 .06  .1  .2 COA    2.2D  54  5 NN
2001 AUG  6 0837 11.53 36 12.56 120 22.37  9.60 42 .09  .1  .2 COA    2.2D  49  5 NN
2001 AUG  7 1338 44.74 37 16.74 120  2.60 16.54 19 .16  .3  .7 KAI    2.2D  82 22 NN
 
2001 AUG  7 1459 43.31 40 20.94 124 10.66 31.04 16 .10  .6 1.1 MEN    3.2D  92  9 NN
2001 AUG  7 2028 50.07 36 49.89 121 33.55  6.43 63 .11  .2  .3 SJB    2.9D  31  2 WW
2001 AUG  7 2031 31.96 36 50.03 121 33.78  6.61 66 .10  .2  .3 SJB    3.0L  33  2 WW
2001 AUG  7 2255 28.95 36 49.74 121 33.23  6.03 59 .10  .2  .3 SJB    2.7D  31  2 WW
2001 AUG  8 0806 15.96 35 49.70 121 22.99  5.50  9 .02 1.5  .4 SSM    2.1D 227  8 WW
 
2001 AUG  8 1110 33.06 37 26.33 118 51.07  7.76 30 .06  .4 1.3 MOR    2.2D 142 12 WW
2001 AUG  8 1755  7.00 39 30.11 122 56.50 10.14 32 .12  .2  .8 BAR    2.7D  77 22 WW