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Maps are updated within about 5 minutes of an earthquake or once an hour.
Brown lines represent known hazardous faults or fault zones. White lines are roads.
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Update time = Mon May 21 1:00:05 PDT 2012
Here are the earthquakes appearing on this map, most recent at top ...

 MAG    DATE    LOCAL-TIME  LAT     LON    DEPTH    LOCATION
        y/m/d     h:m:s     deg     deg     km

 2.0  2012/05/18 12:33:53 40.749N 122.314W  3.5   19 km (12 mi) NNE of Redding, CA
 1.2  2012/05/17 13:00:34 40.183N 121.097W  3.8   13 km ( 8 mi) WNW of Greenville, CA
 0.9  2012/05/17 04:59:03 41.130N 122.092W 11.4   15 km ( 9 mi) SSE of McCloud, CA
 1.1  2012/05/17 01:05:02 40.891N 122.398W  5.2   34 km (21 mi) N   of Redding, CA
 1.3  2012/05/16 16:07:50 40.125N 121.512W 12.3   31 km (19 mi) SW  of Chester, CA
 2.3  2012/05/15 13:07:36 40.243N 121.136W  6.2   11 km ( 7 mi) SE  of Chester, CA
 1.1  2012/05/15 11:06:47 40.743N 121.367W  5.2   29 km (18 mi) ESE of Burney, CA
 0.7  2012/05/15 06:15:35 40.249N 121.393W  4.6   15 km ( 9 mi) WSW of Chester, CA
 1.5  2012/05/14 11:17:54 40.353N 122.067W 10.6   18 km (11 mi) E   of Cottonwood, CA

Special maps:
Long Valley || Los Angeles || San Francisco Index map || big earthquake list || all earthquake list || glossary of terms ||

Data Sources

Northern California - USGS = U.S. Geological Survey, Menlo Park
Northern California - UCB = University of California, Berkeley
Southern California - USGS = U.S. Geological Survey, Pasadena
Southern California - Caltech = California Institute of Technology
Southern California - UCSD = University of California, San Diego
Nevada - UNR = University of Nevada, Reno
US and World - USGS/NEIC = National Earthquake Information Center
Offshore = West Coast & Alaska Tsunami Warning Center
...all members of the Advanced National Seismic System (ANSS)