Northern California Seismicity Report for the week ending May 17, 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

• 21 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 3.9, 9 miles NNW of San Simeon, CA at 02:39 AM UTC Tuesday, 05 15, 2001 (07:39 PM PDT Monday, May 14, 2001).

• 12 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 2.3, 3 miles SW of Gilroy, CA at 02:55 PM UTC Tuesday, 05 15, 2001 (07:55 AM PDT Tuesday, May 15, 2001).

• 19 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 2.8, 8 miles WSW of Toms Place, CA at 08:06 AM UTC Monday, 05 14, 2001 (01:06 AM PDT Monday, May 14, 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 10 1430 39.47 38 46.45 122 43.15  2.97 32 .07  .2  .3 GEY    2.3D  46  0 NN
2001 MAY 11 0109  4.09 35 57.30 119  9.79 15.11  8 .03  .8 3.0 BAK    2.2D 177 49 NN
2001 MAY 11 1536 52.58 35 58.10 120 31.19  7.85 38 .04  .2  .2 MID    2.0D 134  2 NN
2001 MAY 11 1842 53.46 36 52.43 121 36.50  7.82 51 .07  .2  .3 SJB    2.0D  52  2 NN
2001 MAY 12 0209 29.62 36 12.19 120 21.80 10.78 38 .07  .2  .2 COA    2.2D  51  5 NN
 
2001 MAY 12 0646 14.45 40 59.48 123 27.72 26.15 11 .06  .3 1.4 KLA    2.1D  79 26 NN
2001 MAY 12 0847 10.17 36 34.81 121 10.50  5.44 46 .05  .1  .6 PIN    2.3D  37  9 WW
2001 MAY 12 0853 43.34 36 34.77 121 10.43  6.01 56 .06  .1  .5 PIN    2.4D  37  9 NN
2001 MAY 12 0855 38.85 36 34.81 121 10.48  6.20 53 .06  .1  .4 PIN    2.3D  37  9 NN
2001 MAY 12 0905 55.29 36 27.63 121  1.65  2.64 38 .07  .2  .4 BIT    2.0D  81  7 NN
 
2001 MAY 12 1537 27.32 38 49.26 122 48.18  4.29 32 .05  .1  .3 GEY    2.2D  36  2 NN
2001 MAY 12 1756 31.89 40 29.40 123 29.91  6.07 36 .50  .6  .9 EUR    2.7D  60  5 NN
2001 MAY 12 2028  0.84 40 24.03 124 25.92 22.72 13 .03  .7  .3 MEN    2.0D 234 12 NN
2001 MAY 13 1218  9.25 40 24.38 122 41.11  0.02  9 .47 1.811.8 KLA  # 2.1D 124 26 NN
2001 MAY 14 0806 55.66 37 31.82 118 49.11  4.84  8 .02 1.0 1.4 MOR    2.8D 191  7 NN
 
2001 MAY 15 0239 51.15 35 46.12 121 14.26  5.14 55 .06  .2  .6 SSM    3.9L 171 12 NN
2001 MAY 15 0307 39.76 39 42.87 123 41.86  4.44 15 .05  .4  .7 PAR    2.1D 145 10 NN
2001 MAY 15 1455  9.59 36 58.08 121 36.49  4.59 63 .11  .1  .3 SAR    2.3D  45  3 NN
2001 MAY 16 0049 28.05 37 28.31 118 46.89  6.73 31 .07  .3  .7 MOR    2.1D 128  6 WW
2001 MAY 16 0538 48.13 40 38.36 124 23.20  7.61 15 .11  .9  .8 EUR    2.8D 216 19 WW
 
2001 MAY 16 0553 45.68 38 49.37 122 47.90  4.95 22 .03  .2  .4 GEY    2.1D  43  2 WW