Regional Location:
Preliminary Magnitude:
Moment Magnitude:
Greenwich Mean Date:
Greenwich Mean Time:
Latitude:
Longitude:
Focal Depth:
Analysis Quality (A-D):NAPA-SONOMA, NORTHERN CALIFORNIA
ML 5.2 (NCSN)
Mw 5.0 (UC Berkeley)
00/09/03
08:36:30 (1:36 a.m. local time)
38.377N
122.414W
9.4 km (5.8 miles)
AEarthquake activity registering M4+ in the SF Bay Area north of Hayward and south of Willits (The Wine Country) since 1990.
Regional mth day hr lat lon dep mag place 1990 4 6 639 p.m. 37.8753 -121.9797 8.8 4.4 Concord 1990 4 27 942 p.m. 37.8765 -121.9732 6.9 4.4 Concord 1990 4 27 947 p.m. 37.8708 -121.9865 7.9 4.2 Concord 1994 6 26 143 a.m. 37.9158 -122.2862 6.6 4.0 El Cerrito 1998 12 4 416 a.m. 37.92 -122.2898 6.8 4.1 El Cerrito 1999 8 17 606 p.m. 37.9068 -122.6868 6.7 5.0 Bolinas 1999 9 22 327 p.m. 38.395 -122.6337 9.7 4.2 Bennett Valley 2000 9 3 136 a.m. 38.377 -122.4137 9.4 5.2 Napa The Geysers Since 1990, 19 tremors have measured M3.7 or stronger at the Geysers geothermal area, including four in the M4 range mth day hr . lat lon dep mag place 1990 8 14 1205 a.m. 38.8247 -122.7922 3.0 4.1 The Geysers 1992 9 19 304 p.m. 38.8598 -122.7915 4.1 4.3 The Geysers 1996 12 4 221 p.m. 38.7915 -122.7567 3.4 4.0 The Geysers 1998 12 24 919 p.m. 38.7912 -122.7698 5.3 4.0 The Geysers
Here is a nontablized list of significant earthquake measuring M5.0 or stronger since 1850:
Significant U.S. Earthquakes (USHIS) Catalog 1808 06 21 37.80 -122.50 6.0 San Francisco? 1838 06 37.60 -122.40 7.0 Hayward 1861 07 04 0011 37.80 -122.00 5.6 1864 03 05 1649 37.70 -122.00 5.7 1864 05 21 0201 37.60 -122.10 5.3 1868 10 21 1553 37.70 -122.10 6.8 Santa Clara 1869 10 08 0930 39.10 -123.10 5.0 1870 04 02 1948 37.90 -122.30 5.3 1889 05 19 1110 38.00 -121.90 6.0 Antioch 1889 07 31 1247 37.80 -122.20 5.2 1891 10 12 0628 38.30 -122.40 5.5 1892 04 19 1050 38.40 -122.00 6.4 Vacaville 1892 04 21 1743 38.50 -121.90 6.2 Winters 1892 04 30 0009 38.40 -121.80 5.5 1893 08 09 0915 38.40 -122.60 5.1 1898 03 31 0743 38.20 -122.40 6.2 Mare Island 1899 06 02 0719 37.70 -122.50 5.4 1902 05 19 1831 38.30 -121.90 5.4 1906 04 18 131221 37.67 -122.48 20 7.8 San Francisco 1932 10 25 010723 37.75 -122.50 5.1
UC Berkely Catalog 1955/10/24 04:10:44.00 37.9700 -122.0500 0.00 5.40 ML Concord 1957/03/22 19:44:21.00 37.6700 -122.4800 0.00 5.30 ML Daly City 1962/06/06 17:50:06.20 39.0700 -123.3200 0.00 5.20 ML Willits 1969/10/02 04:56:46.50 38.4700 -122.6900 0.00 5.60 ML Santa Rosa 1969/10/02 06:19:57.10 38.4600 -122.6900 0.00 5.70 ML Santa Rosa 1980/01/24 19:00:09.50 37.8300 -121.8100 0.00 5.80 ML Livermore 1980/01/24 19:01:02.10 37.8100 -121.7900 0.00 5.10 ML Livermore 1980/01/27 02:33:36.00 37.7600 -121.7300 0.00 5.40 ML Livermore
- Subtract 7 hours from Greenwich Mean Time to obtain PDT or 4 hours for EST
- Location Quality: A (good), B (fair), C (poor), D (bad)
- Magnitude: Ml (local or Richter magnitude), Lg (mblg), Md (duration), Mb (body wave), Ms (surface wave), Mw (moment)
- Standard Sources Include:
- U.S. Geological Survey, National Earthquake Information Center, Golden, CO (NEIC)
- Harvard Geophysical Observatory, Harvard University, Cambridge, MA (HRV)
- U.S. Geological Survey, Northern California Seismic Network (NCSN)
- University of California, Berkeley, Seismological Laboratory (UCBSL)
- California Institute of Technology, Pasadena, California (Caltech)
- various wire reports and/or personal communications
- All data are preliminary and subject to change.
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