Northern California Seismicity Report for the week ending Jan 18, 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

• 16 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 moderate earthquake of magnitude 5.2, 55 miles WNW of Ferndale, CA at 01:08 PM UTC Saturday, 01 13, 2001 (05:08 AM PST Saturday, Jan 13, 2001).

This is the largest earthquake to occur off the Humbolt County coast since a magnitude 5.2 shock on October 26, 1997 that was located 54 miles west of Trinidad. This latest quake was felt by residents along the coast from at least as far south as Garberville and as far north as Trinidad. Maximum intensity was estimated to be IV in the Whitehorn and Ferndale-Rio Dell areas. Did You Feel It?

• 8 M >1.2 earthquakes in the San Francisco Bay area (map).

The largest event to occur this week in this region was an earthquake of magnitude 1.9, 3 miles WNW of San Juan Bautista, CA at 08:59 PM UTC Monday, 01 15, 2001 (12:59 PM PST Monday, Jan 15, 2001).

• 13 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 2.5, 8 miles WSW of Toms Place, CA at 10:51 AM UTC Monday, 01 15, 2001 (02:51 AM PST Monday, Jan 15, 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 JAN 11 0044  7.50 38 45.95 122 43.58  1.70 14 .05  .2  .4 GEY    2.7D  99  1 WW
2001 JAN 11 1622 59.43 38 50.22 122 52.65  3.84 34 .07  .1  .4 GEY    2.5D  41  4 NN
2001 JAN 11 1810 40.85 40 38.01 124 10.71 23.16 25 .09  .3  .6 EUR    3.8D 152 22 NN
2001 JAN 11 2018 15.02 37 29.17 118 50.51  4.73 30 .05  .3  .9 MOR    2.2D 125 11 NN
2001 JAN 12 2136 13.32 39  9.90 123 33.55  4.72 28 .08  .2  .7 PAR    2.2D 185 13 NN
 
2001 JAN 13 0052 41.07 38 46.32 122 44.69  2.80 36 .07  .1  .4 GEY    2.3D  33  2 NN
2001 JAN 13 1131  2.56 38 49.15 122 48.59  5.04 36 .04  .1  .3 GEY    2.1D  36  2 NN
2001 JAN 13 1308 42.33 40 44.38 125 17.03  5.59166 .30 1.1 1.5 DEL  # 5.2L 235 85 NN
2001 JAN 14 0945 17.04 37 23.89 118 32.16 10.00 31 .05  .3  .8 CHA    2.1D  62  6 NN
2001 JAN 15 1051 50.07 37 32.34 118 48.86  6.37 35 .06  .2  .6 MOR    2.5D 109  6 NN
 
2001 JAN 15 1505 56.17 36  5.52 120  2.31  8.79 28 .07  .3  .1 COA    2.0D 176  7 NN
2001 JAN 15 2351 18.20 40  3.80 121 19.29 10.91 23 .09  .5 1.1 ALM    2.2D 176 19 NN
2001 JAN 16 0206  6.50 38 45.15 122 26.17  0.87 20 .06  .2  .8 GVL    2.0D  90  6 NN
2001 JAN 16 1735 10.06 40 37.97 124 16.43 17.41 10 .07  .8  .7 EUR    2.0D 206 18 WW
2001 JAN 17 1114 22.63 36  3.65 121 35.92  6.31 35 .08  .4  .9 SUR    2.3D 185 14 WW
 
2001 JAN 17 2312  9.78 37 26.74 118 51.06  6.87 30 .05  .6 1.2 MOR    2.1D 153 12 WW