It struck near Angwin in Napa County, according to the United States Geological Survey.
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The quake hit at 12:36 a.m. and was centered 7.6 miles east-southeast of Angwin, 17.5 miles north of Napa and 19.4 miles north-northeast of Sonoma, the USGS said.
So far, there are no reports of injuries or damage.
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