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)
A

Earthquake 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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