At least three minor to moderate earthquakes struck Thursday morning in the Geysers area of northern Sonoma County, according to the United States Geological Survey.
The most recent quake, measured at a 3.9 magnitude, was reported at 9:11 a.m. and centered about 14 miles northeast of Healdsburg, the USGS said.
The first two temblors were reported at about 4:21 a.m. Thursday, just seconds apart, and measured 3.6 and 3.7 magnitude, the USGS said. They were centered is the same general area as the latest quake.
The Geysers area, near Cobb, California, is known for rampant seismic activity, though much of the earthquakes recorded there typically have magnitudes below 3.0.
No injuries or damage were immediately reported.
Further information was not immediately available.
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NBC Bay Area staff
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