Northern California Seismicity Report for the week ending Apr 05, 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

• 15 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 an earthquake of magnitude 3.0, 8 miles S of Tres Pinos, CA at 12:26 PM UTC Tuesday, 04 03, 2001 (05:26 AM PDT Tuesday, Apr 03, 2001).

• 9 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, 11 miles W of Los Banos, CA at 12:49 AM UTC Tuesday, 04 03, 2001 (05:49 PM PDT Monday, Apr 02, 2001).

• 20 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 3.0, 10 miles SE of Mammoth Lakes, CA at 05:57 PM UTC Saturday, 03 31, 2001 (09:57 AM PST Saturday, Mar 31, 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 MAR 29 0651 40.79 37 19.94 121 41.91  7.53 60 .05  .1  .3 SFL    2.0D  55  6 NN
2001 MAR 29 1958 33.32 37  7.00 118  2.02  1.72 16 .08 1.1 2.3 DEV    2.1D 218 35 NN
2001 MAR 29 2345 17.60 38 48.25 122 48.53  2.29 24 .05  .2  .3 GEY    2.4D  69  1 NN
2001 MAR 30 0003 48.15 40 36.82 123 49.31 23.13 20 .05  .5  .3 EUR    2.5D  94 21 NN
2001 MAR 30 0711 14.70 38 49.64 122 48.01  4.66 40 .05  .1  .3 GEY    2.7D  48  2 NN
 
2001 MAR 31 0209 15.92 38 48.96 122 49.78  1.80 38 .05  .1  .3 GEY    3.0D  42  3 NN
2001 MAR 31 0651 15.93 38 48.34 122 47.94  1.97 28 .03  .1  .2 GEY    2.1D  39  0 NN
2001 MAR 31 1430 14.12 37 58.81 121 22.42 16.55 26 .17  .4  .8 JQN    2.2D  72 30 NN
2001 MAR 31 1757  8.18 37 32.10 118 51.96  7.55 35 .06  .2  .6 MOR    3.0D 111  7 NN
2001 APR  1 1218  0.27 38 47.37 122 27.45  8.26 34 .18  .2  .6 GVL    2.2D  46  2 NN
 
2001 APR  2 0522 17.43 37 31.87 118 26.77  9.25 26 .06  .2  .5 CHV    2.3D  89  2 NN
2001 APR  3 0049 26.54 37  4.99 121  2.51  4.98 37 .14  .3  .9 ORT    2.3D 128  8 WW
2001 APR  3 0121 43.27 36 12.79 120 34.80  7.84 16 .07  .2  .2 COA    2.1D  70  2 WW
2001 APR  3 1226  3.92 36 40.89 121 18.24  4.36 63 .07  .1  .3 STN    3.0D  59  3 WW
2001 APR  3 1427 46.61 36 24.59 120 59.26  5.54 41 .06  .1  .3 BIT    2.0D  67  3 NN