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
Seismic activity was very light this week. The largest event to occur this week in Northrn California was a minor earthquake of magnitude 3.5 3 miles N of Redding, CA at 03:39 AM UTC Thursday, Oct 01, 1998 (08:39 PM PDT Wednesday, Sep 30, 1998).
The largest event to occur this week in this region was a microearthquake of magnitude 2.2 9 miles N of Morgan Hill, CA at 09:21 AM UTC Thursday, Oct 01, 1998 (02:21 AM PDT Thursday, Oct 01, 1998).
The largest event to occur this week in the Long Valley area was a minor earthquake of magnitude 3.2 7 miles W of Toms Place, CA at 04:58 AM UTC Tuesday, Oct 06, 1998 (09:58 PM PDT Monday, Oct 05, 1998). Activity is at or below average.
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 OCT 1 339 34.82 40 37.76 122 24.01 25.52 18 1 .10 .3 .9 SHA 3.5D 98 OCT 1 921 44.01 37 15.18 121 38.30 6.33 86 3 .05 .1 .2 SFL 2.2D 98 OCT 2 1035 48.54 37 37.28 118 48.58 4.74 23 .06 .2 .4 HCF 2.2D 98 OCT 2 1104 21.93 36 32.23 121 7.17 3.32 47 .05 .1 .4 PIN 2.4D 98 OCT 2 1530 42.53 39 16.46 123 25.76 1.45 26 3 .06 .2 2.2 PAR 2.1D 98 OCT 2 1808 30.85 38 48.89 122 48.72 3.24 20 .05 .2 .5 GEY 2.1D 98 OCT 2 2312 3.63 36 51.65 121 31.60 6.22 45 .10 .2 .3 SJB 2.2D 98 OCT 3 1452 4.44 36 52.13 121 31.98 8.38 47 .12 .2 .4 BUS 2.2D 98 OCT 3 1658 45.36 38 45.66 122 44.44 10.40 15 .33 1.1 1.3 GEY 2.1D 98 OCT 3 1732 55.85 37 35.70 118 47.87 7.07 28 .06 .2 .4 MOR 2.1D 98 OCT 3 1927 1.15 38 47.44 122 45.29 3.00 30 .06 .2 .5 GEY 2.4D 98 OCT 4 218 52.78 38 25.05 122 37.26 5.66 39 1 .10 .2 .4 ROG 2.0D 98 OCT 5 453 25.41 37 33.44 118 48.57 5.77 35 1 .06 .2 .4 MOR 2.6D 98 OCT 5 723 13.17 37 11.69 119 21.29 34.57 19 2 .05 .8 .4 KAI # 2.5D 98 OCT 5 724 53.73 38 44.36 122 43.26 3.25 40 .07 .1 .3 NAP 2.5D 98 OCT 6 458 14.77 37 33.86 118 48.02 4.29 35 1 .08 .2 .6 MOR 3.2D 98 OCT 6 838 16.92 37 33.09 118 49.06 4.48 30 .07 .3 .5 MOR 3.1D 98 OCT 6 902 5.83 37 32.76 118 49.13 4.13 28 .05 .3 .6 MOR 2.3D 98 OCT 6 1305 39.96 38 48.86 122 48.62 3.83 32 .04 .2 .3 GEY 2.4D 98 OCT 6 2153 38.94 37 38.09 118 55.32 8.63 29 .08 .3 .4 SMO 2.6D 98 OCT 7 917 0.30 37 38.17 118 49.56 9.42 31 .04 .3 .6 HCF 2.8D
