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 microearthquake of magnitude 2.8, 9 miles SE of Parkfield, CA at 05:05 PM UTC Saturday, 04 29, 2000 (10:05 AM PDT Saturday, Apr 29, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.5, 5 miles WNW of Daly City, CA at 06:04 AM UTC Saturday, 04 29, 2000 (11:04 PM PDT Friday, Apr 28, 2000).
The largest event to occur this week in this region was a microearthquake of magnitude 2.8, 10 miles SSE of Toms Place, CA at 09:30 AM UTC Thursday, 04 27, 2000 (02:30 AM PDT Thursday, Apr 27, 2000).
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 2000 APR 27 0930 23.88 37 25.57 118 36.93 9.04 33 .06 .2 .7 RVL 2.8D 114 3 NN 2000 APR 27 1312 25.06 37 29.59 118 52.12 6.92 33 .06 .2 .7 MOR 2.2D 118 10 NN 2000 APR 27 1423 50.20 37 13.06 118 55.21 24.54 12 .46 3.210.1 KAI 2.6D 193 44 WW 2000 APR 27 2053 18.24 37 35.88 118 47.54 6.96 30 .06 .2 .4 MOR 2.1D 70 3 NN 2000 APR 28 1117 26.98 39 28.45 122 56.21 12.67 30 .06 .2 .4 BAR 2.1D 79 2 NN 2000 APR 28 1416 41.57 36 2.14 119 37.41 21.12 30 .22 1.0 .5 JQN 2.6D 64 36 NN 2000 APR 29 0604 49.01 37 44.27 122 33.07 7.22 61 .04 .1 .4 SFP 2.5D 99 9 NN 2000 APR 29 1705 41.06 35 47.63 120 20.63 9.75 46 .04 .1 .3 GOL 2.8D 57 4 NN 2000 APR 30 0040 56.36 37 32.34 118 49.85 8.20 34 .06 .2 .5 MOR 2.3D 107 5 NN 2000 MAY 2 0052 12.76 39 23.92 123 4.19 5.90 33 .08 .2 .8 BAR 2.6D 56 16 NN 2000 MAY 2 0611 1.59 38 48.49 122 48.37 3.83 39 .04 .1 .3 GEY 2.2D 34 1 NN 2000 MAY 2 0809 47.13 36 7.98 121 34.44 0.66 56 .08 .3 2.2 SUR 2.3D 186 19 NN 2000 MAY 2 1014 45.67 37 55.33 122 17.43 6.54 42 .09 .1 .3 HAY 2.2D 48 4 WW 2000 MAY 2 1157 12.91 37 24.38 118 30.37 6.10 26 .07 .2 .8 CHA 2.8D 116 8 WW 2000 MAY 2 1228 56.26 36 49.24 121 32.81 7.14 41 .08 .2 .4 SJB 2.2D 36 4 WW 2000 MAY 3 2106 33.99 38 50.53 122 48.20 1.56 22 .04 .2 .5 GEY 2.5D 92 4 WW 2000 MAY 3 2202 51.26 38 50.84 122 47.98 1.47 15 .05 .2 .6 GEY 2.2D 94 4 WW 2000 MAY 3 2205 11.82 37 43.69 122 7.06 8.20 56 .08 .1 .3 HAY 2.3D 34 0 WW 2000 MAY 3 2343 13.02 38 49.50 122 47.87 4.46 16 .04 .2 .5 GEY 2.0D 52 2 WW
