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 3.8, 14 miles SW of Los Banos, CA at 04:22 PM UTC Saturday, 03 25, 2000 (08:22 AM PST Saturday, Mar 25, 2000).
This earthquake likely occurred on the Ortigalita fault. It was preceded by a M2.9 the previous day. The M3.8 event had approximately 11 aftershocks as of the time of this report.
The largest event to occur this week in this region was a minor earthquake of magnitude 3.8, 14 miles SW of Los Banos, CA at 04:22 PM UTC Saturday, 03 25, 2000 (08:22 AM PST Saturday, Mar 25, 2000).
See above description. In addition, there was a M3.1 earthquake that occurred near Union City at the intersection of the Hayward and Mission faults at 13:03 UTC on 03/28. Earthquakes of this magnitude at this location are not unusual.
The largest event to occur this week in this region was a minor earthquake of magnitude 3.1, 10 miles WSW of Toms Place, CA at 11:14 AM UTC Sunday, 03 26, 2000 (03:14 AM PST Sunday, Mar 26, 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 MAR 23 0505 30.01 36 48.54 121 32.13 7.55 60 .10 .2 .3 SJB 2.4D 34 3 NN 2000 MAR 23 0626 17.40 38 50.29 122 52.88 4.07 42 .07 .1 .4 GEY 2.4D 29 4 NN 2000 MAR 23 1339 24.73 40 21.14 124 13.11 28.65 17 .08 .7 1.1 MEN 3.2D 156 11 NN 2000 MAR 23 1634 59.34 38 32.31 122 31.19 8.63 42 .11 .2 .5 NAP 2.2D 29 8 NN 2000 MAR 24 0258 58.66 38 44.93 122 55.13 6.96 35 .07 .2 .4 ROG 2.2D 39 7 NN 2000 MAR 24 0311 47.73 38 48.26 122 47.71 1.66 35 .05 .1 .3 GEY 2.4D 36 0 NN 2000 MAR 24 0312 45.68 38 48.35 122 47.47 1.16 31 .03 .1 .1 GEY 2.3D 38 0 NN 2000 MAR 24 0823 26.25 38 50.35 122 47.95 1.51 44 .04 .1 .3 GEY 2.7D 28 3 NN 2000 MAR 24 1059 13.65 38 54.44 122 40.83 2.91 24 .08 .2 .5 KON 2.0D 74 4 NN 2000 MAR 25 0338 6.51 36 54.18 121 1.11 2.78 65 .05 .2 1.9 ORT 2.9D 135 14 NN 2000 MAR 25 1622 49.80 36 54.24 121 1.03 4.62 81 .08 .2 .6 ORT 3.8D 135 14 NN 2000 MAR 26 0740 41.01 36 32.92 121 8.39 6.98 42 .06 .1 .3 PIN 2.1D 38 5 NN 2000 MAR 26 1114 7.34 37 29.27 118 50.37 3.34 36 .06 .3 1.1 MOR 3.1D 78 10 NN 2000 MAR 26 1723 8.27 37 29.30 118 50.33 4.07 34 .06 .2 .6 MOR 2.3D 120 8 NN 2000 MAR 27 0230 33.26 37 31.87 118 49.13 6.55 36 .06 .2 .4 MOR 2.7D 109 4 NN 2000 MAR 27 1306 15.65 36 53.86 121 1.05 0.52 57 .06 .2 3.9 ORT 2.1D 68 18 NN 2000 MAR 28 0616 36.57 37 11.37 119 46.07 21.77 10 .04 .8 .3 KAI 2.3D 167 14 NN 2000 MAR 28 2103 7.30 37 37.88 122 1.14 5.83 75 .10 .1 .3 HAY 3.1D 35 2 WW 2000 MAR 29 0405 54.06 41 13.24 123 26.71 38.18 24 .27 .6 .9 KLA 3.1L 53 6 WW 2000 MAR 29 0840 5.82 36 46.78 121 29.67 7.43 56 .14 .2 .4 SJB 2.5D 35 3 WW
