Update: 3.7 magnitude earthquake shakes close to Petrolia, CA on March 20

HUMBOLDT COUNTY, CA - According to the U.S. Geological Survey, a 3.7 magnitude quake jolted near Petrolia on Friday morning.
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Multiple Earthquakes Hit Northern California, Swarm Activity Detected Near Geysers

Earthquakes hit Aromas and The Geysers on Thursday, followed by swarm activity, highlighting ongoing seismic activity in the region.
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Earthquakes rattle California city after weeks of silence as seismic disaster looms

Seismic activity has returned to a California city after weeks of unusual calm, rattling nerves in a region already on edge from months of earthquake swarms. The US Geological Survey (USGS) reported ...