Northern California Seismicity Report for the week ending Mar 22, 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

• 13 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 3.3, 9 miles WSW of Toms Place, CA at 02:55 AM UTC Saturday, 03 17, 2001 (06:55 PM PST Friday, Mar 16, 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 microearthquake of magnitude 3.0, 10 miles E of San Jose City Hall, CA at 03:46 AM UTC Friday, 03 16, 2001 (07:46 PM PST Thursday, Mar 15, 2001).

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

The largest event to occur this week in this region was a minor earthquake of magnitude 3.3, 9 miles WSW of Toms Place, CA at 02:55 AM UTC Saturday, 03 17, 2001 (06:55 PM PST Friday, Mar 16, 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 15 1134 40.37 40 40.92 123 27.67 31.36 21 .05  .2  .6 EUR    2.7D  71 17 NN
2001 MAR 15 1948 32.25 39 39.03 122 49.39  0.60 20 .15  .3 1.1 SAC    2.0D  63  9 NN
2001 MAR 16 0346 58.69 37 20.23 121 42.18  8.04 80 .05  .1  .3 ALU    3.0D  42  5 NN
2001 MAR 17 0255 42.34 37 31.22 118 49.71  6.93 38 .06  .2  .7 MOR    3.3L  78  8 NN
2001 MAR 17 1822  3.84 39 37.80 122 49.73  0.02 27 .25  .4 1.4 SAC  # 2.7D 108 10 NN
 
2001 MAR 18 0801 24.24 40 21.75 124 19.74 28.44 15 .11 1.0 1.2 MEN    2.7D 186 13 NN
2001 MAR 18 1501  9.70 37 46.68 122 35.36  9.46 49 .05  .2  .3 SFP    2.2D 164  8 NN
2001 MAR 18 1752 41.64 39  1.57 122 55.25 20.62 25 .11  .4  .6 MAA    2.0D  48  9 NN
2001 MAR 18 2117  1.89 38 48.16 122 43.96  3.81 37 .08  .1  .3 GEY    2.4D  45  4 NN
2001 MAR 19 2102 32.28 38 46.68 122 45.90  1.93 25 .07  .2  .4 GEY    2.2D  59  4 WW
 
2001 MAR 19 2103  7.50 38 49.41 122 49.97  0.98 12 .03  .2  .6 GEY    2.3D  72  4 WW
2001 MAR 20 1133 26.23 40 41.80 123 28.81 27.98  9 .13  .8 1.6 EUR    2.4D 135 18 WW
2001 MAR 21 2122  0.19 38 50.25 122 52.68  4.01 33 .07  .2  .5 GEY    2.6D  38  4 WW