An earthquake with a preliminary magnitude of 6.0 shook the northern San Francisco Bay area early Sunday, the U.S. Geological Survey reported. 

Leslie Gordon of the U.S. Geological Survey told the Associated Press that the tremor struck at just before 3:30 a.m. Sunday about 10 miles northwest of American Canyon, which is about six miles southwest of Napa.

The USGS says it's the largest tremor to shake the Bay Area since the 1989 6.9 magnitude Loma Prieta quake and that the depth of the quake was less than seven miles with several small aftershocks. 

Thus far, there have been reports of power outages and property damage, but no immediate official reports of injury. 

 

 

UPDATE, 11:58 a.m.: Nearly one hundred injuries have now been reported with some being critical.