A series of small earthquakes has rattled northern California, with over two dozen minor tremors detected within 30 miles of the San Andreas Fault in the past day. The strongest and most recent was a magnitude 2.7 quake that struck at 10:14 a.m. ET Monday morning in The Geysers, a large geothermal field north of San Francisco known for frequent swarms of tiny tremors.
According to the United States Geological Survey (USGS), these quakes ranged between 2.5 and 2.7 in magnitude, and no injuries, damage, or tsunami warnings have been reported. Seismic activity of this type, called an “earthquake swarm,” involves a series of small quakes that occur over days, weeks, or even months, often without a single dominant main shock…