SANOMA, Calif. - An earthquake with a preliminary magnitude of 6.0 was reported early Sunday in California's northern San Francisco Bay Area.
Leslie Gordon of the United States Geological Survey said the tremor struck about 3:30 a.m. Sunday, about 10 miles northwest of American Canyon, which is about six miles southwest of Napa. The agency said it was the largest tremor to shake the Bay Area since the 6.9 magnitude Loma Prieta quake in 1989.
The quake set off car alarms and had residents of neighboring Sonoma County running out of their houses in the middle of night. Power was knocked out in some areas.
The agency said the depth of the earthquake was just less than seven miles, and numerous small aftershocks occurred in the Napa wine country.
A member of Napa County dispatch told The Associated Press that there had been one report of structural damage, but additional details were not available.
There was no immediate report of injuries.
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