Northern California Seismicity Report for the week ending May 10, 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

• 34 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, 8 miles WSW of Toms Place, CA at 08:22 AM UTC Friday, 05 04, 2001 (01:22 AM PDT Friday, May 04, 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 2.2, 5 miles NE of San Martin, CA at 05:15 AM UTC Friday, 05 04, 2001 (10:15 PM PDT Thursday, May 03, 2001).

• 18 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 3.2, 8 miles WSW of Toms Place, CA at 08:22 AM UTC Friday, 05 04, 2001 (01:22 AM PDT Friday, May 04, 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 MAY  3 0235 40.06 36 34.30 118 12.42  4.24 39 .11  .6 1.2 WWF    2.7D 152 47 NN
2001 MAY  3 0329 55.65 37 52.46 121 49.66 11.83 30 .08  .3  .4 GRN    2.1D 107  7 NN
2001 MAY  3 0939 54.60 36 36.34 121 10.67  6.65 54 .06  .1  .3 PIN    2.5D  49  7 NN
2001 MAY  3 2133 31.11 36 36.55 121 10.64  7.68 62 .08  .1  .3 PIN    3.0L  40  6 NN
2001 MAY  3 2235 28.98 36 33.03 121  8.52  6.38 38 .05  .1  .5 PIN    2.0D  56  7 NN
 
2001 MAY  4 0158 12.08 38 46.12 122 42.79  2.94 35 .06  .2  .2 GEY    2.2D  52  1 NN
2001 MAY  4 0307 34.61 40  7.13 123  3.15 38.30 30 .14  .4 1.2 KLA    2.2D  40 26 NN
2001 MAY  4 0515  3.24 37  7.79 121 31.79  7.46 74 .07  .1  .3 CYN    2.2D  71  2 NN
2001 MAY  4 0822 13.01 37 32.35 118 48.88  6.60 35 .07  .3  .6 MOR    3.2L 109  6 NN
2001 MAY  4 1009 40.90 40 16.09 121 52.57 16.01 12 .08  .3 1.5 SHA    2.2D  87 22 NN
 
2001 MAY  4 1847 33.75 37 59.07 122 27.61  0.04  8 .15  .5 1.8 MAR  # 2.2D  97  6 NN
2001 MAY  4 1923 55.23 38 47.82 122 46.21  5.13 37 .05  .1  .3 GEY    2.1D  35  2 NN
2001 MAY  4 1928  5.10 36  0.80 119 55.44 14.05 20 .15 1.4 1.6 COA    2.0D 214 18 NN
2001 MAY  4 2326 13.83 36 14.79 120 19.77  8.97 35 .10  .2  .2 COA    2.7D  63  1 NN
2001 MAY  5 0003 44.03 35 57.49 120 30.53  9.12 37 .03  .2  .2 MID    2.1D 104  1 NN
 
2001 MAY  5 0358 19.15 41  3.37 122  8.08  4.03  9 .22  .815.4 SHA  -       84 31 WW
2001 MAY  5 1153 53.07 38 48.37 122 46.50  2.68 41 .10  .2  .4 GEY    3.2L  42  2 WW
2001 MAY  5 1200 54.07 38 48.39 122 46.39  1.02 15 .02  .2  .4 GEY    2.0D  44  2 WW
2001 MAY  5 2358 47.69 38 47.24 122 43.37  3.02 34 .06  .1  .3 GEY    2.3D  36  2 NN
2001 MAY  6 1636  0.37 36  1.38 120 36.33  6.41 39 .12  .2  .3 SLA    2.1D 110  5 NN
 
2001 MAY  6 1940 24.38 38 50.04 122 52.28  2.11 21 .05  .2  .5 GEY    2.1D  38  4 WW
2001 MAY  6 2011  6.70 37 54.47 121 57.94 13.60 43 .10  .2  .3 CON    2.0D  57  5 NN
2001 MAY  6 2221 13.80 38 46.51 122 44.76  3.59 37 .07  .1  .3 GEY    2.5D  31  3 NN
2001 MAY  7 0217  9.24 38 48.39 122 44.09  3.81 31 .06  .1  .4 GEY    2.2D  59  4 NN
2001 MAY  7 0323 19.20 36 35.64 121 11.42  5.45 57 .06  .1  .4 PIN    2.6D  39  8 NN
 
2001 MAY  7 0404 57.26 38 45.25 122 26.72  6.11 30 .10  .2  .4 GVL    2.2D  46  6 NN
2001 MAY  7 1300 25.25 36 28.28 121  2.82  5.74 39 .06  .2  .5 BIT    2.2D  57  5 WW
2001 MAY  7 1409 39.87 37 32.33 118 48.82  6.83 30 .06  .3  .6 MOR    2.3D 109  6 WW
2001 MAY  8 1028 22.01 39 47.24 122 54.29  3.68 23 .05  .2 7.0 SAC  - 2.1D  78 22 NN
2001 MAY  8 1041 36.76 38 48.03 122 43.90  3.65 36 .07  .1  .3 GEY    2.1D  52  3 NN
 
2001 MAY  8 1356 41.94 37 17.00 119 28.01 36.86 12 .08  .5 1.1 KAI    2.2D  94 27 NN
2001 MAY  9 1758 46.64 37 29.28 118 50.26  3.21 27 .06  .3 1.1 MOR    2.4D 125 10 WW
2001 MAY  9 2141  5.13 38 49.18 122 47.63  3.84  9 .04  .3  .8 GEY    2.2D  67  1 WW
2001 MAY  9 2209  9.96 39 45.11 122 51.52  0.45 34 .18  .2 1.6 SAC    2.8D  41 16 WW