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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 = Sun May 26 1:00:02 PDT 2013
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

 2.7  2013/05/22 14:26:44 40.295N 124.398W 22.6    5 km ( 3 mi) NW  of Punta Gorda, CA
 2.1  2013/05/22 06:27:41 40.140N 123.835W 23.3    2 km ( 2 mi) NNW of Redway, CA
 1.8  2013/05/21 13:41:10 39.407N 123.329W  3.1    2 km ( 1 mi) E   of Willits, CA
 1.8  2013/05/21 12:42:28 39.343N 123.177W  7.9   17 km (11 mi) ESE of Willits, CA
 1.8  2013/05/20 10:23:18 40.841N 123.891W 25.4    9 km ( 6 mi) ESE of Blue Lake, CA
 1.5  2013/05/20 05:23:56 40.141N 123.809W 24.2    3 km ( 2 mi) NNE of Redway, CA
 2.1  2013/05/19 07:14:42 40.263N 123.092W 41.8   33 km (21 mi) SSE of Hayfork, 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)