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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 = Wed Dec 11 13:00:04 PST 2019
Here are the earthquakes appearing on this map, most recent at top ...

        y/m/d     h:m:s     deg     deg     km
 1.7 2019/12/08 13:31:02 40.354N 124.396W 14.7   27 km (17 mi) SSW of Ferndale, CA
 2.1 2019/12/06 20:38:59 40.304N 124.342W 21.3   29 km (18 mi) SW  of Rio Dell, CA
 3.1 2019/12/06 20:27:59 40.281N 124.309W 19.7   30 km (18 mi) SW  of Rio Dell, CA
 3.0 2019/12/06 10:04:35 40.413N 124.644W 19.8   37 km (23 mi) WSW of Ferndale, CA

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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)

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