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 3.5 8 miles WNW of Toms Place, CA at 06:01 AM UTC Saturday, Sep 05, 1998 (11:01 PM PDT Friday, Sep 04, 1998).
The largest event to occur this week in this region was a microearthquake of magnitude 2.6 4 miles NNE of Tres Pinos, CA at 10:47 PM UTC Thursday, Sep 03, 1998 (03:47 PM PDT Thursday, Sep 03, 1998).
The largest event to occur this week in this region was a minor earthquake of magnitude 3.5 8 miles WNW of Toms Place, CA at 06:01 AM UTC Saturday, Sep 05, 1998 (11:01 PM PDT Friday, Sep 04, 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 SEP 3 323 24.58 36 35.13 121 10.75 4.65 55 .05 .1 .3 PIN 2.6D 98 SEP 3 1008 33.56 36 50.26 121 17.82 6.78 56 .05 .2 .3 QUI 2.2D 98 SEP 3 1241 49.73 36 50.26 121 17.81 7.15 63 .07 .2 .3 QUI 2.5D 98 SEP 3 1329 10.73 37 28.89 118 51.16 1.95 27 .07 .5 .8 MOR 2.2D 98 SEP 3 1425 35.96 36 50.61 121 17.94 6.64 58 .05 .1 .3 QUI 2.5D 98 SEP 3 1821 57.80 36 45.10 120 54.62 3.55 39 1 .05 .1 1.4 ORT 2.1D 98 SEP 3 2247 44.12 36 50.57 121 18.08 6.43 71 4 .07 .1 .3 QUI 2.6D 98 SEP 3 2322 12.30 37 34.44 118 47.00 7.73 33 .06 .3 .5 MOR 2.3D 98 SEP 4 831 12.86 37 32.16 118 48.82 6.09 36 1 .05 .2 .5 MOR 2.3D 98 SEP 4 1224 16.87 36 48.04 121 30.81 5.51 53 1 .09 .1 .3 SJB 2.4D 98 SEP 5 432 39.67 38 47.72 122 48.59 4.16 23 .04 .2 .4 GEY 2.3D 98 SEP 5 451 46.14 38 51.26 122 48.67 1.76 19 .04 .2 .6 GEY 2.1D 98 SEP 5 601 38.80 37 35.52 118 48.97 5.58 34 1 .05 .2 .3 MOR 3.5D 98 SEP 5 921 50.56 35 49.13 121 23.73 5.36 40 .07 .4 .3 SSM 2.3D 98 SEP 5 1404 1.06 38 59.29 122 25.32 6.56 36 .14 .2 .8 SAC 2.5D 98 SEP 5 1553 37.82 37 35.42 118 49.18 5.53 29 .06 .3 .4 MOR 2.5D 98 SEP 6 102 22.30 40 22.07 124 12.57 30.06 12 .08 .7 1.2 MEN 2.1D 98 SEP 6 734 49.18 35 45.33 121 15.75 0.65 49 .05 .3 1.8 SSM 2.8D 98 SEP 6 1003 18.23 37 35.24 118 48.59 5.62 32 .06 .3 .4 MOR 2.9D 98 SEP 6 2249 52.16 36 21.46 119 56.09 19.92 52 3 .14 .5 .2 JQN 2.6D 98 SEP 7 133 40.87 40 14.30 124 10.01 11.20 15 1 .12 .6 .5 MEN 2.2D 98 SEP 7 502 10.61 37 34.85 118 47.77 5.45 26 .06 .3 .5 MOR 2.1D 98 SEP 7 1034 54.30 37 34.80 118 47.62 6.09 36 2 .05 .2 .4 MOR 2.8D 98 SEP 7 1054 40.38 37 35.02 118 47.35 4.96 23 .07 .3 .7 MOR 2.5D 98 SEP 7 1457 10.55 36 30.90 120 45.13 10.57 51 1 .09 .2 .3 CRV 2.8D 98 SEP 7 1556 6.32 36 49.61 121 32.85 5.06 52 .13 .2 .4 SJB 2.6D 98 SEP 8 923 45.27 37 8.84 121 58.94 16.86 62 .08 .2 .3 LOM 2.3D 98 SEP 8 924 40.78 37 35.08 118 47.49 5.43 23 .06 .3 .7 MOR 2.8D 98 SEP 8 1629 24.28 39 2.34 123 5.37 0.01 29 .26 .4 7.3 MAA # 2.6D 98 SEP 8 1753 49.27 36 43.51 121 23.13 6.85 44 .08 .2 .4 STN 2.2D 98 SEP 9 809 1.59 39 18.26 122 46.73 8.97 20 .11 .4 1.3 BAR 2.5D 98 SEP 9 1440 23.11 37 35.01 118 47.11 6.82 28 .07 .3 .6 MOR 2.3D 98 SEP 9 1546 27.10 37 33.22 118 48.97 0.66 23 .21 .5 .9 MOR 2.3D 98 SEP 9 2343 30.62 37 32.32 118 48.76 6.24 30 .06 .3 .6 MOR 2.4D
