Northern California Seismicity Report for the week ending Jun 27, 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

• 19 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 3.4, 1 miles S of Lopez Point, CA at 07:43 AM UTC Friday, 06 21, 2002 (12:43 AM PDT Friday, Jun 21, 2002).

• 4 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 2.1, 4 miles S of Hollister, CA at 09:10 PM UTC Tuesday, 06 25, 2002 (02:10 PM PDT Tuesday, Jun 25, 2002).

• 16 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 2.9, 4 miles WSW of Mammoth Lakes, CA at 08:00 PM UTC Tuesday, 06 25, 2002 (01:00 PM PDT Tuesday, Jun 25, 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 JUN 20 0512 24.83 38 47.65 122 48.07  5.29 39 .06  .1  .3 GEY    2.6D  34  2 NN
2002 JUN 21 0019 12.78 40 26.24 121 16.61  4.79 10 .02  .8 1.5 ALM    2.1D 207 13 AW
2002 JUN 21 0042 58.42 36 35.91 121 12.40  8.70 48 .05  .1  .4 PIN    2.6D  31  8 WW
2002 JUN 21 0743 10.01 36  0.64 121 33.97  2.03 72 .05  .2  .9 SUR    3.4L 181 20 NN
2002 JUN 22 0856 24.87 40 43.46 123 50.88 21.58 38 .12  .2  .6 EUR    3.2L 113 33 AN
 
2002 JUN 22 1124  0.21 36  4.36 120  2.65 17.16 26 .11  .3  .5 COA    2.1D 181  6 NN
2002 JUN 22 1226 23.68 36 17.68 119 42.34 18.87 66 .31  .5  .6 JQN    2.6D  53 34 NN
2002 JUN 22 1233  6.77 36 18.71 119 43.26 20.34  8 .03 2.2  .7 JQN         211 54 NN
2002 JUN 22 1355  5.89 37 30.86 118 26.05 10.03 14 .06  .4  .9 CHV    2.2D 150  4 WW
2002 JUN 23 1006 44.70 39 41.19 120 51.10  5.00 11 .10  .5 8.9 WAK  - 2.3D 120 48 NN
 
2002 JUN 25 1933 56.43 37 37.73 119  3.23  4.48 30 .09  .3  .4 MAM    2.5D  62  2 WW
2002 JUN 25 2000 34.65 37 37.77 119  2.71  3.74  8 .02  .4  .7 MAM    2.9D 140  1 WW
2002 JUN 25 2000 36.64 37 36.71 119  3.83  4.50 11 .13 1.010.1 MAM  - 2.3D 161 33 WW
2002 JUN 25 2110 51.06 36 48.06 121 23.33  6.63 46 .08  .2  .4 HOL    2.1D  58  4 WW
2002 JUN 25 2246 50.34 36 38.36 121 15.13  5.92 48 .06  .1  .5 STN    2.5D  61  4 WW
 
2002 JUN 25 2352 15.31 36 57.97 121 35.78  7.71 62 .14  .2  .5 SAR    2.1D  30  2 WW
2002 JUN 26 0357  7.85 36 38.43 121 15.22  6.16 51 .06  .1  .5 STN    2.7D  61  6 WW
2002 JUN 26 0402  1.69 36 38.41 121 15.20  6.07 46 .06  .2  .4 STN    2.4D  61  3 WW
2002 JUN 26 0637 24.89 36  1.38 120 57.90  7.89 38 .05  .2  .5 ROB    2.2D  87  7 WW