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 8 miles WNW of Toms Place, CA at 10:43 AM UTC Thursday, Jul 02, 1998 (03:43 AM PDT Thursday, Jul 02, 1998).
The largest event to occur this week in this region was a microearthquake of magnitude 3.0 7 miles SE of Livermore, CA at 02:59 AM UTC Monday, Jul 06, 1998 (07:59 PM PDT Sunday, Jul 05, 1998).
The largest event to occur this week in this region was a minor earthquake of magnitude 3.1 8 miles WNW of Toms Place, CA at 10:43 AM UTC Thursday, Jul 02, 1998 (03:43 AM PDT Thursday, Jul 02, 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 JUL 2 711 33.67 37 35.17 118 47.67 7.61 27 .07 .3 .6 MOR 2.2D 98 JUL 2 1043 10.22 37 35.72 118 49.00 5.79 27 .07 .3 .4 MOR 3.1D 98 JUL 2 1214 19.79 37 35.82 118 49.43 5.83 28 .07 .3 .4 MOR 2.9D 98 JUL 2 1430 21.03 37 35.51 118 48.09 6.96 27 .07 .3 .6 MOR 2.2D 98 JUL 2 1453 1.82 41 0.29 121 58.77 17.97 22 1 .16 .4 2.4 SHA 2.4D 98 JUL 2 1636 46.39 37 45.20 122 33.00 5.21 46 .06 .2 .5 SFP 2.6D 98 JUL 2 1700 3.45 37 29.24 118 56.96 0.81 29 .10 .3 .7 SIL 2.4D 98 JUL 2 1951 51.89 36 35.58 121 12.00 7.48 41 .06 .2 .4 PIN 2.2D 98 JUL 3 412 2.45 40 20.35 124 12.80 21.70 11 1 .09 .6 .5 MEN 2.8D 98 JUL 3 412 2.45 40 20.42 124 12.73 21.72 10 1 .08 .5 .3 MEN 2.8D 98 JUL 3 1114 21.72 37 34.77 118 46.65 6.39 32 1 .06 .3 .5 MOR 2.1D 98 JUL 3 1635 28.16 38 49.54 122 49.62 2.24 25 .04 .2 .4 GEY 2.2D 98 JUL 3 1910 47.66 37 36.16 119 2.58 8.65 30 .07 .2 .4 MAM 2.6D 98 JUL 3 2100 9.14 38 47.79 122 43.93 3.14 29 .05 .2 .5 GEY 2.3D 98 JUL 3 2108 28.99 37 34.91 118 46.74 5.58 24 .06 .3 .9 MOR 2.2D 98 JUL 3 2153 18.61 37 32.74 118 48.68 1.28 8 .03 1.3 .6 MOR 2.4D 98 JUL 4 123 2.97 38 46.94 122 45.61 2.74 28 .07 .2 .6 GEY 2.3D 98 JUL 4 237 53.30 37 35.33 118 47.38 7.64 27 .05 .3 .6 MOR 2.5D 98 JUL 4 313 37.48 37 34.83 118 46.93 6.25 27 .08 .3 1.0 MOR 2.7D 98 JUL 4 320 50.58 37 35.38 118 47.32 7.56 28 .07 .3 .6 MOR 2.5D 98 JUL 4 748 15.60 38 49.49 122 47.88 5.28 38 .06 .2 .3 GEY 3.1D 98 JUL 4 1021 44.63 38 48.24 122 48.30 1.51 30 .05 .1 .3 GEY 2.5D 98 JUL 4 1037 47.16 38 49.85 122 48.23 2.08 22 .06 .2 .5 GEY 2.1D 98 JUL 4 1159 49.82 37 34.59 118 47.39 3.23 23 .06 .3 .8 MOR 2.1D 98 JUL 5 115 40.31 37 33.76 118 48.51 5.52 27 .06 .3 .6 MOR 2.3D 98 JUL 5 1039 28.83 36 36.34 121 12.45 2.58 35 .08 .2 .5 PIN 2.6D 98 JUL 5 1834 29.54 37 16.64 121 39.29 7.18 78 2 .03 .1 .2 SFL 2.2D 98 JUL 6 259 38.79 37 35.68 121 41.14 14.22 72 3 .09 .1 .3 HAM 3.0D 98 JUL 6 2129 12.80 37 33.00 118 48.67 4.36 22 .05 .4 .7 MOR 2.1D 98 JUL 7 1614 33.80 37 37.75 118 50.51 9.63 25 .04 .3 .4 HCF 2.2D 98 JUL 7 2103 2.12 39 27.83 122 56.09 12.24 27 .07 .2 .5 BAR 2.4D
