Northern California Seismicity Report for the week ending Mar 29, 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

• 14 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 ENE of The Geysers, CA at 06:26 AM UTC Saturday, 03 24, 2001 (10:26 PM PST Friday, Mar 23, 2001).

• 8 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 3.2, 9 miles N of Morgan Hill, CA at 08:47 AM UTC Friday, 03 23, 2001 (12:47 AM PST Friday, Mar 23, 2001).

• 6 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 1.9, 6 miles ESE of Mammoth Lakes, CA at 05:21 PM UTC Wednesday, 03 28, 2001 (09:21 AM PST Wednesday, Mar 28, 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 22 0312 44.43 39 13.88 122 47.54  6.21 35 .12  .2  .8 BAR    2.3D  53 12 NN
2001 MAR 22 0640  2.47 37 19.44 120  2.11 15.07 19 .20  .5  .5 KAI    2.0D 131 26 NN
2001 MAR 22 1102 53.26 36 39.40 121 16.47  5.72 59 .06  .1  .3 STN    2.6D  57  1 NN
2001 MAR 22 1231 54.10 40  8.46 123 13.16 35.37 54 .12  .2  .6 MEN    3.0D  39 21 NN
2001 MAR 22 1255 52.81 40  7.43 123 11.74 35.22 40 .12  .2  .7 KLA    3.0D  39 23 NN
 
2001 MAR 22 1310 47.16 40  8.37 123 12.99 37.37 20 .09  .3 1.1 MEN    2.3D  62 22 NN
2001 MAR 23 0013 24.56 38 48.50 122 46.71  2.77 35 .05  .1  .3 GEY    2.6D  43  1 NN
2001 MAR 23 0847 13.85 37 15.73 121 38.50  7.43 81 .06  .1  .3 SFL    3.2D  55  3 NN
2001 MAR 23 1502  7.58 40 14.60 124  9.63 12.75 18 .17  .5  .6 MEN    3.3D  81  6 NN
2001 MAR 24 0352  5.50 39 36.03 122  0.32 20.96 38 .17  .3  .6 SAC    2.5D  44 34 NN
 
2001 MAR 24 0626 24.05 38 48.23 122 47.53  4.87 44 .08  .1  .3 GEY    3.4L  46  0 WW
2001 MAR 26 1728 45.80 39 15.93 123  5.17  6.22 13 .05  .9 1.6 MAA    2.2D 212 15 WW
2001 MAR 26 2200 59.66 38 50.22 122 48.32  1.39 14 .03  .2  .7 GEY    2.1D  91  3 WW
2001 MAR 27 1221 49.99 40 25.69 124 20.63 27.18 13 .06 1.0 1.0 MEN    3.0D 215  5 WW