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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 = Sat Mar 28 7:00:04 PDT 2020
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

 2.5 2020/03/27 21:57:27 40.726N 124.404W 20.8   18 km (11 mi) W   of Humboldt Hill, CA
 1.8 2020/03/27 18:01:03 40.412N 124.647W 25.4   37 km (23 mi) WSW of Ferndale, CA
 2.7 2020/03/25 17:58:46 40.413N 124.910W  6.1   58 km (36 mi) WSW of Ferndale, CA
 2.3 2020/03/24 00:13:05 40.452N 124.770W 18.5   45 km (28 mi) WSW of Ferndale, CA
 1.5 2020/03/23 06:47:03 40.434N 124.160W 23.3    9 km ( 5 mi) SSW of Rio Dell, CA
 3.5 2020/03/23 03:07:55 40.309N 124.672W 16.1   46 km (28 mi) SW  of Ferndale, CA
 1.3 2020/03/22 13:14:09 40.484N 124.162W 22.9    5 km ( 3 mi) WSW of Rio Dell, CA
 4.8 2020/03/22 09:27:38 40.425N 124.827W 12.4   50 km (31 mi) WSW of Ferndale, CA

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

Data Sources

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