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 light earthquake of magnitude 4.4 10 miles W of Bishop, CA at 01:53 AM UTC Monday, Nov 08, 1999 (05:53 PM PST Sunday, Nov 07, 1999).
This earthquake was located at the southern end of round Valley just west of the Tungsten Hills. It was followed by an aftershock sequence that has included 9 earthquakes with M>=2.0, including a M3.1 event at 7:37 PM PST on the 7th. This earthquake sequence is located some 6 miles SSE of the M6.1 Round Valley earthquake sequence of November 23, 1984.
The largest event to occur this week in this region was a microearthquake of magnitude 2.6 6 miles SSE of San Juan Bautista, CA at 10:44 PM UTC Saturday, Nov 06, 1999 (02:44 PM PST Saturday, Nov 06, 1999).
The largest event to occur this week in this region was a microearthquake of magnitude 2.9 7 miles ESE of Mammoth Lakes, CA at 11:36 PM UTC Friday, Nov 05, 1999 (03:36 PM PST Friday, Nov 05, 1999).
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 99 NOV 4 151 30.86 37 27.96 118 50.17 6.49 33 .04 .3 .6 MOR 2.3D 99 NOV 4 1459 56.56 36 39.95 120 53.17 6.19 47 2 .05 .1 .4 ORT 2.1D 99 NOV 4 2312 55.18 40 38.07 122 25.12 23.43 17 2 .10 .3 .6 SHA 3.0D 99 NOV 5 356 30.46 36 48.68 121 32.12 7.39 60 2 .09 .2 .3 SJB 2.1D 99 NOV 5 640 9.38 38 46.03 122 44.26 4.05 34 .06 .1 .3 GEY 2.2D 99 NOV 5 2336 3.44 37 37.12 118 50.91 7.88 34 .05 .3 .4 SMO 2.9D 99 NOV 6 128 56.64 37 5.32 119 29.03 39.05 22 3 .07 .6 1.4 KAI # 2.3D 99 NOV 6 849 26.01 40 38.42 122 24.42 24.06 9 .03 .9 1.4 SHA 2.1D 99 NOV 6 2244 31.26 36 45.73 121 29.61 10.91 54 3 .11 .2 .4 SJB 2.6D 99 NOV 7 142 8.04 39 54.09 123 34.96 4.26 22 1 .14 .3 .4 MAA 2.4D 99 NOV 7 1253 34.19 40 1.32 121 1.77 0.04 37 .41 .7 2.8 ALM # 2.5D 99 NOV 8 55 34.65 38 48.80 122 48.57 4.48 23 .03 .2 .5 GEY 2.1D 99 NOV 8 153 12.41 37 21.40 118 34.90 9.41 34 .05 .5 .8 KAI 4.4L 99 NOV 8 157 38.15 37 21.29 118 34.61 9.90 19 .04 .8 .9 KAI 2.4D 99 NOV 8 335 17.46 37 21.49 118 34.82 9.57 29 1 .06 .3 .6 KAI 2.5D 99 NOV 8 337 5.01 37 21.21 118 34.66 10.20 32 .05 .4 .6 KAI 3.1L 99 NOV 8 344 58.29 37 21.28 118 34.56 10.48 27 .06 .4 .6 KAI 2.7D 99 NOV 8 430 57.06 37 20.78 118 34.68 10.72 30 .06 .5 .7 KAI 2.6D 99 NOV 8 452 2.63 37 21.47 118 34.56 9.96 24 .05 .5 .7 KAI 2.6D 99 NOV 8 456 15.34 37 21.32 118 34.63 10.08 24 .04 .4 .6 KAI 2.2D 99 NOV 8 750 34.38 36 40.66 121 18.21 4.93 60 2 .05 .1 .2 STN 2.4D 99 NOV 8 2116 54.11 37 29.26 118 50.28 4.00 33 .04 .2 .8 MOR 2.3D 99 NOV 9 541 29.31 38 23.32 122 37.62 1.47 28 .07 .2 .4 ROG 2.2D 99 NOV 9 1457 55.75 38 48.04 122 43.83 3.49 30 .06 .2 .4 GEY 2.5D 99 NOV 9 2009 42.48 37 21.29 118 34.94 9.57 32 .05 .2 .4 KAI 2.4D 99 NOV 10 105 7.19 38 23.88 122 35.87 6.61 37 .10 .2 .5 ROG 2.5D 99 NOV 10 1359 26.35 37 28.04 118 50.66 5.09 28 .06 .3 1.0 MOR 2.8D
