Northern California Seismicity Report for the week ending Jun 28, 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 3.1, 7 miles S of Tres Pinos, CA at 06:14 AM UTC Friday, 06 22, 2001 (11:14 PM PDT Thursday, Jun 21, 2001).

• 17 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, 14 miles SSW of Gustine, CA at 07:57 PM UTC Sunday, 06 24, 2001 (12:57 PM PDT Sunday, Jun 24, 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 3.0, 13 miles SW of Toms Place, CA at 11:08 PM UTC Friday, 06 22, 2001 (04:08 PM PDT Friday, Jun 22, 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 JUN 21 0820  3.17 38 49.55 122 47.74  4.23 30 .04  .1  .3 GEY    2.2D  38  2 NN
2001 JUN 22 0614 35.20 36 41.52 121 18.95  3.37 59 .07  .1  .3 STN    3.1D  42  3 WW
2001 JUN 22 1656 44.02 39 42.12 123 26.05  0.03 18 .11  .2 2.2 MAA    2.2D  65  7 NN
2001 JUN 22 2308 45.61 37 26.46 118 51.00  7.77 34 .07  .4 1.3 MOR    3.0D 142 12 WW
2001 JUN 23 1305 30.55 38 57.60 122 41.86  3.38 25 .09  .2  .6 KON    2.2D  66  3 NN
 
2001 JUN 23 1335 23.65 37 13.98 118 23.92 15.94 30 .06 1.1  .9 KAI    2.6D 200 11 NN
2001 JUN 23 2030 26.60 36 43.23 120 44.37  0.05 30 .06  .5 1.3 ORT  # 2.2D 229  8 NN
2001 JUN 24 0423 16.30 37 25.73 118 37.29 11.24 32 .05  .2  .7 RVL    2.2D 116  2 NN
2001 JUN 24 0851  1.69 37 29.45 118 50.30  3.48 34 .05  .2  .8 MOR    2.8D  82  7 NN
2001 JUN 24 1251 23.38 37 34.69 118 48.08  6.89 31 .06  .3  .7 MOR    2.1D  84  6 WW
 
2001 JUN 24 1936  5.20 37  5.53 121  7.32  0.03 56 .14  .3 2.4 ORT  # 2.4D 134  9 WW
2001 JUN 24 1957 21.47 37  5.36 121  7.68  0.01 69 .17  .3 2.7 ORT  # 3.1L 128  9 WW
2001 JUN 24 2048 34.34 37  6.19 121  6.19  0.03 52 .18  .4 3.3 ORT  # 2.1D  90 16 WW
2001 JUN 24 2134 21.50 37  5.12 121  8.57  0.01 67 .23  .6 3.7 ORT  # 3.0L 168  9 WW
2001 JUN 25 1004 52.67 37 29.53 118 50.28  3.50 32 .06  .3 1.0 MOR    2.6D 124  7 NN
 
2001 JUN 26 0151 44.49 37  6.09 121  6.62  0.63 44 .22  .5 9.7 ORT  # 2.2D 111 10 WW
2001 JUN 26 0405 56.79 38 52.96 123  0.07  4.36 16 .04  .2 1.0 MAA    2.0D  63  6 WW
2001 JUN 26 0524  3.07 40 31.09 123 31.46 11.55 11 .23  .8  .6 EUR    2.1D  97  2 WW
2001 JUN 26 0934 11.28 38 45.41 122 43.48  3.02 18 .07  .2  .5 GEY    2.1D  94  2 WW
2001 JUN 26 1325 39.28 37 31.59 118 49.30  4.79 30 .06  .3  .7 MOR    2.2D 113  4 WW
 
2001 JUN 26 2224 59.98 40 31.37 123 49.19 23.83 12 .06  .4  .6 EUR    2.5D  95 11 WW
2001 JUN 27 1508 34.91 38 23.99 122 38.13  4.55 40 .13  .2  .4 ROG    2.7D  43  3 WW