A preliminary 6.0 magnitude earthquake damaged buildings and sent dishes flying inside northern California homes, starting people living there awake this morning.

The earthquake's epicenter was located about six miles south-southwest of Napa and 51 miles west-southwest of Sacramento and hit about 3:20 a.m. local time, according to the U.S. Geological Survey. It's the largest earthquake to shake the Bay Area since the 1989 6.9 magnitude Loma Prieta quake.

Dozens of aftershocks followed with one reaching 3.6 magnitude, said the USGS.

 Preliminary reports estimate 70,000 are without power.

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