6.0 magnitude earthquake rattled California's northern Bay Area early Sunday, USGS says

NAPA, Calif. - The largest earthquake to hit the San Francisco Bay Area in 25 years sent scores of people to hospitals, ignited fires, damaged multiple historic buildings and knocked out power to tens of thousands in California's wine country on Sunday.

The 6.0-magnitude earthquake that struck at 3:20 a.m. about 6 miles (10 kilometers) from the city of Napa ruptured water mains and gas lines, left two adults and a child critically injured, upended bottles and casks at some of Napa Valley's famed wineries and sent residents running out of their homes in the darkness.

Dazed residents too fearful of aftershocks to go back to bed wandered at dawn through Napa's historic downtown, where the quake had shorn a 10-foot (3-meter) chunk of bricks and concrete from the corner of an old county courthouse. Bolder-sized pieces of rubble littered the lawn and street in front of the building and the hole left behind allowed a view of the offices inside.

College student Eduardo Rivera, 20, said the home he shares with six relatives shook so violently that he kept getting knocked back into his bed as he tried to flee.

"When I woke up, my mom was screaming, and the sound from the earthquake was greater than my mom's screams," Rivera said.

President Barack Obama was briefed on the earthquake, the White House said. Federal officials also have been in touch with state and local emergency responders. Gov. Jerry Brown declared a state of emergency for southern Napa County, directing state agencies to respond with equipment and personnel.

Napa Fire Department Operations Chief John Callanan said the city has exhausted its own resources trying to extinguish six fires, some in places with broken water mains; transporting injured residents; searching homes for anyone who might be trapped; and answering calls about gas leaks and downed power lines.

Two of the fires happened at mobile home parks, including one where four homes were destroyed and two others damaged, Callanan said.

The earthquake sent at least 87 people to Queen of the Valley Medical Center in Napa, where officials set up a triage tent to handle the influx. Most patients had cuts, bumps, bruises, said Vanessa DeGier, hospital spokeswoman said. She says the facility has treated a hip fracture and heart attack, but it's unclear if it was related to the quake.

The child in critical condition was struck by part of a fireplace and had to be airlifted to a specialty hospital for a neurological evaluation, Callanan said.

The earthquake is the largest to shake the Bay Area since the 6.9-magnitude Loma Prieta quake in 1989, the USGS said. That temblor struck the area on Oct. 17, 1989, during a World Series game between the San Francisco Giants and the Oakland Athletics, collapsing part of the Bay Bridge roadway and killing more than 60 people, most when an Oakland freeway fell.

Pacific Gas and Electric spokesman J.D. Guidi said close to 30,000 lost power right after the quake hit, but the number was down just under 19,000, most of them in Napa. He says crews are working to make repairs, but it's unclear when electricity would be restored.

The depth of the earthquake was just less than 7 miles (11 kilometers), and numerous small aftershocks have occurred, the USGS said.

"A quake of that size in a populated area is of course widely felt throughout that region," said Randy Baldwin, a geophysicist with the U.S. Geological Survey in Golden, Colorado.

"It was a rolling quake, said Oakland resident Rich Lieberman. "It started very much like a rolling sensation and just got progressively worse in terms of length. Not so much in terms of shaking, but it did shake. It felt like a side-to-side kind of rolling sensation. Nothing violent but extremely lengthy and extremely active."

The USGS says the depth of the earthquake was just less than seven miles, and numerous small aftershocks have occurred in the Napa wine country.

"A quake of that size in a populated area is of course widely felt throughout that region," said Randy Baldwin, a geophysicist with the U.S. Geological Survey in Golden, Colorado. "The 6.0 is a sizeable quake for this area. It's a shallow quake. It's about 6 miles deep. We received hundreds of reports on our website from people that felt it in the surrounding area."

Numerous emergency vehicles were on the roads in Napa and Sonoma counties.

California Highway Patrol Officer Daniel Hill told KTVU-TV that road damage appears confined to the Napa and Sonoma areas. He said there appears to be no damage to major bridges in the Bay Area.

"They are in pretty good shape," he said, noting that a couple of the roadways in the Napa-Sonoma area have some bumps and cracks.

In Napa, a water main break left at least one street flooded, and power outages left streetlights dark.

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