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A 3.9 magnitude earthquake struck Northern California's Redwood Valley area Monday and was quickly followed by a 2.7 aftershock, according to the U.S. Geological Survey

A quake hit the region about 2:30 p.m., followed a half-hour later by the aftershock, officials said.

There were no immediate reports of injuries or damage.

In August, a 4.0 earthquake shook up the Bay Area, with an epicenter in Oakland.