Northern California Seismicity Report for the week ending
Jan 25, 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
- 17 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 3.0, 2 miles NW of The Geysers, CA at 12:21 AM UTC Saturday, 01 20, 2001 (04:21 PM PST Friday, Jan 19, 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, 4 miles W of Glen Ellen, CA at 01:28 PM UTC Monday, 01 22, 2001 (05:28 AM PST Monday, Jan 22, 2001).
- 10 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 2.3, 11 miles SW of Toms Place, CA at 09:30 AM UTC Saturday, 01 20, 2001 (01:30 AM PST Saturday, Jan 20, 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 18 0026 40.55 38 48.00 122 44.26 2.13 8 .03 .3 .9 GEY 2.8D 77 3 WW
2001 JAN 18 0026 44.21 38 47.80 122 43.98 4.20 34 .07 .2 .6 GEY 2.3D 42 3 NN
2001 JAN 19 0036 44.77 37 30.23 118 49.75 6.82 11 .02 .7 1.1 MOR .8X 219 10 NN
2001 JAN 19 1715 49.47 38 48.38 122 46.76 2.26 26 .05 .2 .2 GEY 2.2D 41 1 NN
2001 JAN 20 0021 28.99 38 48.79 122 49.94 1.29 10 .03 .3 .6 GEY 3.0D 98 3 WW
2001 JAN 20 0021 32.92 38 48.90 122 49.41 1.11 37 .05 .1 .4 GEY 2.5D 30 6 NN
2001 JAN 20 0930 44.52 37 28.37 118 50.73 6.41 32 .05 .3 1.0 MOR 2.3D 130 11 NN
2001 JAN 20 1552 25.37 41 29.80 121 58.23 8.47 8 .01 .3 2.0 MOD 2.3D 99 15 NN
2001 JAN 21 0033 48.76 41 4.77 123 17.22 32.28 15 .15 .7 1.8 KLA # 2.8D 89 26 NN
2001 JAN 21 1042 43.91 40 24.19 121 56.86 19.00 13 .07 .4 .9 SHA 2.4D 85 14 NN
2001 JAN 22 1328 31.96 38 22.29 122 35.96 1.72 25 .06 .2 .2 ROG 2.3D 48 3 NN
2001 JAN 22 2235 56.65 38 48.65 122 47.36 0.91 16 .02 .2 .3 GEY 2.0D 42 1 WW
2001 JAN 23 0402 52.14 38 45.59 122 43.99 1.54 16 .05 .2 .8 GEY 2.1D 67 6 WW
2001 JAN 23 0404 9.36 38 45.56 122 43.71 2.47 32 .09 .2 .4 GEY 2.7D 44 2 WW
2001 JAN 24 0503 47.97 38 9.76 122 16.27 7.93 14 .11 .6 .9 NAP 2.1D 122 10 WW
2001 JAN 24 1854 36.48 38 49.70 122 48.19 2.48 19 .04 .2 1.1 GEY 2.0D 46 2 WW
2001 JAN 24 2037 0.88 37 22.23 118 24.77 6.53 19 .05 1.0 3.2 OWV 2.0D 126 10 WW
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