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@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
The largest event to occur this week in this region was a minor earthquake of magnitude 3.1 2 miles NNW of The Geysers, CA at 11:57 AM UTC Monday, Nov 23, 1998 (03:57 AM PST Monday, Nov 23, 1998).
The largest event to occur this week in this region was a microearthquake of magnitude 2.4 2 miles ENE of San Leandro, CA at 09:55 AM UTC Sunday, Nov 22, 1998 (01:55 AM PST Sunday, Nov 22, 1998).
The largest event to occur this week in this region was a microearthquake of magnitude 2.7 6 miles W of Toms Place, CA at 04:23 PM UTC Thursday, Nov 19, 1998 (08:23 AM PST Thursday, Nov 19, 1998).
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 N RMS ERH ERZ LOC PREF YR MON DA HRMN SEC DEG MIN DEG MIN KM RD S SEC KM KM REMKS MAG 98 NOV 19 1623 47.03 37 34.32 118 46.96 8.25 33 2 .06 .3 .6 MOR 2.7D 98 NOV 20 924 53.02 39 3.00 123 44.15 1.51 20 2 .16 .9 4.5 PAR # 2.1D 98 NOV 21 127 48.17 37 55.87 122 1.92 9.65 44 2 .09 .1 .2 CON 2.1D 98 NOV 21 153 15.17 36 8.04 120 16.32 7.44 34 2 .05 .3 .3 COA 2.3D 98 NOV 21 1307 29.69 36 50.61 121 34.20 5.42 58 .12 .1 .3 SJB 2.2D 98 NOV 21 2302 32.06 37 30.92 118 46.45 5.46 29 .06 .3 .4 WCN 2.2D 98 NOV 22 820 20.37 39 13.63 123 5.99 7.52 39 .07 .2 .7 MAA 2.8D 98 NOV 22 955 29.60 37 44.41 122 7.54 7.65 64 4 .06 .1 .2 HAY 2.4D 98 NOV 22 1039 48.01 36 50.53 121 34.27 5.99 45 .09 .2 .5 SJB 2.3D 98 NOV 22 1419 58.76 38 46.78 122 44.84 5.16 27 .06 .2 .5 GEY 2.1D 98 NOV 22 1852 2.60 36 42.32 121 1.05 0.96 60 2 .34 .3 2.6 ORT # 2.4D 98 NOV 23 1157 24.57 38 49.18 122 49.10 0.08 35 .13 .2 1.2 GEY 3.1D 98 NOV 23 2041 43.56 40 12.85 124 9.71 13.10 25 .16 .5 .3 MEN 3.0D 98 NOV 24 1213 9.45 40 40.95 124 31.41 24.54 17 1 .05 .7 1.7 EUR 2.4D 98 NOV 25 1631 3.22 37 52.53 121 47.78 3.76 23 .10 .4 1.5 GRN 2.2D 98 NOV 25 1636 7.62 39 22.30 123 16.32 3.57 20 .08 .3 2.7 MAA 2.2D 98 NOV 25 2038 49.53 38 31.22 122 19.31 1.83 31 .22 .3 2.4 GVL 2.1D
