Northern California Seismicity Report for the week ending Jul 18, 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

• 26 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 light earthquake of magnitude 4.1, 2 miles NNW of Bishop, CA at 08:18 PM UTC Monday, 07 15, 2002 (01:18 PM PDT Monday, Jul 15, 2002).

• 25 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 3.1, 11 miles N of Morgan Hill, CA at 07:07 PM UTC Wednesday, 07 17, 2002 (12:07 PM PDT Wednesday, Jul 17, 2002).

• 10 M >1.2 earthquakes in the Long Valley region (map).

The largest event to occur this week in this region was an earthquake of magnitude 2.5, 11 miles WSW of Toms Place, CA at 06:29 AM UTC Wednesday, 07 17, 2002 (11:29 PM PDT Tuesday, Jul 16, 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 JUL 11 0410  9.83 38 48.14 122 46.58  1.60 34 .03  .1  .2 GEY    3.0D  39  2 NN
2002 JUL 11 0411  6.35 38 48.02 122 46.30  2.10 12 .02  .2  .4 GEY    2.1D  67  2 NN
2002 JUL 11 0527 22.40 40 34.88 121 50.59 15.08 16 .06  .4  .7 SHA    2.5D 103 11 AW
2002 JUL 11 0812 46.58 38 47.98 122 45.27  1.54 24 .06  .2  .4 GEY    2.2D  37  4 NN
2002 JUL 11 1220 49.75 37  6.85 121 31.44  7.21 76 .07  .1  .3 CYN    2.4D  48  1 NN
 
2002 JUL 12 0522 21.89 40 35.33 122 19.32 18.86 11 .06  .4  .6 SHA    2.2D  88 19 AW
2002 JUL 12 1918  3.45 35 44.31 119 46.83  8.87  8 .06 1.1 4.2 BAK         223 21 NN
2002 JUL 13 0009 46.74 35 23.27 120 54.61  4.44 31 .09  .3  .8 SSM    2.3D 146 14 NN
2002 JUL 13 1038  0.77 40 52.22 121 56.08 17.47 15 .07  .3 1.1 SHA    2.1D  91 12 AW
2002 JUL 13 1802  7.75 37 28.30 121 40.84  5.08 54 .05  .1  .4 HAM    2.3D  35  3 WW
 
2002 JUL 14 0647 37.50 38 45.52 122 41.91  0.01 16 .15  .3 1.5 NAP  # 2.2D  64  6 WW
2002 JUL 14 1038 58.84 38 46.37 122 44.57  3.21 16 .05  .2  .6 GEY    2.0D  36  2 WW
2002 JUL 14 1556 50.72 40 14.96 124 10.95 10.55  8 .09  .5  .8 MEN    2.5D 106  7 WW
2002 JUL 14 2321 46.11 36 17.33 120 24.49 10.42 53 .10  .2  .2 COA    2.9D  62  6 NN
2002 JUL 15 2018 17.56 37 23.03 118 24.40 13.63 34 .07  .6 1.3 CHV    4.1L 117 12 NW
 
2002 JUL 16 0112  9.89 40  9.76 122 16.18 34.92 20 .20  .6 1.5 KLA    2.8D  74 13 WW
2002 JUL 16 0214 57.71 36  5.29 121 17.23  8.10 66 .06  .1  .6 SSM    2.4D  89 11 NN
2002 JUL 16 1215 59.06 38 49.48 122 47.66  4.51 24 .06  .3  .4 GEY    2.4D  79  2 WW
2002 JUL 16 1356 36.21 36 35.12 121 10.77  3.37 49 .07  .1  .4 PIN    2.6D  39  2 NN
2002 JUL 16 1721 18.27 36 38.32 121 15.30  6.44 38 .06  .2  .4 STN    2.1D  64  4 WW
 
2002 JUL 17 0535 32.94 36 37.35 121  7.08  8.19 47 .10  .2  .4 BVL    2.2D  55  5 WW
2002 JUL 17 0629 32.87 37 29.90 118 52.19  6.28 31 .06  .3 1.0 MOR    2.5D 122  9 WW
2002 JUL 17 0705 47.57 37 29.82 118 52.26  6.09 28 .07  .3 1.0 MOR    2.0D 122 11 WW
2002 JUL 17 1204 46.12 37  2.01 121 29.41  7.60 64 .10  .2  .4 CYS    2.2D  53  1 WW
2002 JUL 17 1712  3.25 36 38.26 121 15.34 10.63 59 .07  .1  .3 STN    2.8D  61  4 WW
 
2002 JUL 17 1907 42.84 37 17.38 121 39.95  6.48 77 .07  .1  .3 SFL    3.1L  50  3 WW