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USGS upgrades Thursday earthquake near The Geysers to magnitude 3.8

An earthquake that rattled The Geysers area Thursday morning was upgraded to 3.8 magnitude, the U.S. Geological Survey said Friday.

The quake, initially measured at 3.5, struck about 11:30 a.m. and was centered about 14 miles north of Healdsburg in a remote area of Sonoma County. Another 2.4 magnitude quake struck about 10 minutes after.

The USGS said the quake struck 1.6 miles deep.

No injuries were reported.

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