Northern California Seismicity Report for the week ending Jul 19, 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 3.3, 9 miles SSW of Somes Bar, CA at 06:10 AM UTC Thursday, 07 12, 2001 (11:10 PM PDT Wednesday, Jul 11, 2001).

• 14 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 2.6, 4 miles W of Cupertino, CA at 07:34 PM UTC Thursday, 07 12, 2001 (12:34 PM PDT Thursday, Jul 12, 2001).

• 9 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, 12 miles SW of Toms Place, CA at 09:15 PM UTC Saturday, 07 14, 2001 (02:15 PM PDT Saturday, Jul 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 JUL 12 0610 33.91 41 14.68 123 30.98 39.18 40 .19  .3  .4 KLA    3.3D  56  7 NN
2001 JUL 12 1934 20.76 37 19.49 122  6.30  0.04 14 .13  .3  .8 BLM  # 2.6D  71  1 WW
2001 JUL 12 2301 37.71 40 24.16 124  5.14 21.89 12 .09  .4  .6 MEN    2.2D  90  3 NN
2001 JUL 13 1311 59.08 39 12.79 123  7.44  6.17 17 .04  .2 1.0 MAA    2.2D  56 10 WW
2001 JUL 13 1713 26.83 40 32.95 121 40.86  8.23 10 .08  .5 1.0 SHA    2.4D  95  9 WW
 
2001 JUL 14 0023 49.79 36 16.14 120 50.61  7.25 63 .14  .2  .4 BIT  # 3.2L  62  7 NN
2001 JUL 14 1722 32.99 41  7.67 122 21.92 12.42 20 .14  .4  .8 SHA    2.5D  90  8 NN
2001 JUL 14 2115  3.07 37 27.02 118 50.70  7.30 30 .07  .3  .9 MOR    2.2D 138 11 NN
2001 JUL 14 2209 57.02 36 36.06 121 12.24  7.16 60 .06  .1  .3 PIN    2.8D  32  3 NN
2001 JUL 15 0141 25.99 37 22.72 122 15.55 10.47 71 .08  .1  .2 BLM    2.5D  80  6 AN
 
2001 JUL 15 1103 25.27 38 50.57 124 24.64  0.36 46 .22 1.7 5.1 PON    2.3D 229 79 WW
2001 JUL 16 0958  5.54 37 27.19 118 50.71  6.62 25 .07  .3 1.2 MOR    2.0D 136 11 WW
2001 JUL 16 1827 17.95 36  9.73 120 44.00  9.22 38 .09  .2  .4 BIT    2.5D  77  6 WW
2001 JUL 16 2008  2.72 35 47.83 120 20.85 10.45 42 .04  .2  .3 GOL    2.9D  56  4 WW
2001 JUL 17 1019 16.97 39 57.75 122 44.82  0.02 15 .35  .5 3.7 SAC  # 2.4D  79  8 WW
 
2001 JUL 17 1601 57.28 36 27.67 121  2.35  5.88 47 .07  .2  .5 BIT    2.7D  72  4 WW
2001 JUL 18 0117 13.50 40 56.61 123 23.28  9.77 10 .25  .9 2.0 KLA    2.2D  83 30 WW
2001 JUL 18 0939 47.16 38 48.79 122 48.82  4.49 18 .03  .2  .4 GEY    2.2D  44  2 WW
2001 JUL 18 0944 27.17 37 50.37 121 46.78 19.34 47 .13  .3  .2 GRN    2.4D 104 12 WW
2001 JUL 18 1611 49.46 36 43.90 121 23.08  2.92 38 .07  .2  .3 SJB    2.2D  36  3 WW
 
2001 JUL 18 1736 33.78 36 43.88 121 23.19  2.89 54 .07  .1  .3 SJB    3.2L  36  3 WW
2001 JUL 18 2205 28.97 40 36.22 122 10.19  1.14  9 .14  .512.3 SHA -  2.3D 136 19 WW