USGS: 6.0 earthquake shakes Northern California

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USGS: 6.0 earthquake shakes Northern California
A mailbox is all that remains of one of four mobile homes which were destroyed in a gas fire Sunday, Aug. 24, 2014, at the Napa Valley Mobile Home Park, in Napa, Calif. A large earthquake caused significant damage and left at least three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Ben Margot)
A Napa firefighter inspects one of four mobile homes that were destroyed in a gas fire Sunday, Aug. 24, 2014, at the Napa Valley Mobile Home Park, in Napa, Calif. A large earthquake caused significant damage and left at least three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Ben Margot)
Napa firemen douse the remains of a mobile home Sunday, Aug. 24, 2014, at the Napa Valley Mobile Home Park, in Napa, Calif. A large earthquake caused significant damage and left at least three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Ben Margot)
The remains of one of four mobile homes smolders after a fire engulfed it Sunday, Aug. 24, 2014, at the Napa Valley Mobile Home Park, in Napa, Calif. A large earthquake caused significant damage and left at least three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Ben Margot)
Napa Fire Captain Steve Becker inspects mobile homes which were destroyed Sunday, Aug. 24, 2014, at the Napa Valley Mobile Home Park, in Napa, Calif. A gas fire at the park is being blamed as the result of a 6.0-magnitude earthquake which struck California's northern San Francisco Bay area this morning. (AP Photo/Ben Margot)
Steve Brody inspects damage to the interior of his mobile home after an earthquake Sunday, Aug. 24, 2014, at the Napa Valley Mobile Home Park, in Napa, Calif. A large earthquake caused significant damage and left at least three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Ben Margot)
Nina Quidit cleans up the Dollar Plus and Party Supplies Store in American Canyon Calif. after an earthquake on Sunday Aug. 24, 2014. Quidit and her husband were woken up in the early morning hours by the store's alarm company and immediately drove in to begin clean up. The 6.0-magnitude quake caused six significant fires, including at four mobile homes, Napa Division Fire Chief Darren Drake said. (AP Photo/Alex Washburn)
A youngster rides his scooter over a sidewalk buckled by an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage and left at least three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Rich Pedroncelli)
RT @WillKane Firefighters are doing their best to control the blaze, calling for an ambulance. http://t.co/WMGqnrfwZq #earthquake
People walk past a tumbled mannequin and broken storefront window on First Street following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake rolled through California's northern Bay Area early Sunday, damaging some buildings, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness.(AP Photo/Eric Risberg)
A broken mannequin and storefront window are on First Street following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake rolled through California's northern Bay Area early Sunday, damaging some buildings, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Bricks are in the street after a building was damaged during an earthquake in Napa, Calif., Sunday, Aug. 24, 2014. A large earthquake rolled through California's northern Bay Area early Sunday, damaging some buildings, knocking out power to thousands and sending residents running out of their homes in the darkness. (AP Photo/Ellen Knickmeyer)
NAPA, CA - AUGUST 24: A man surveys a destroyed building following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
Bricks and rubble cover the sidewalk in front of a heavily damaged building following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage and left three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Two men on bicycles ride past the Vintners Collective tasting room and look at damage following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage and left three critically injured in California's northern Bay Area early Sunday, igniting fires, sending at least 87 people to a hospital, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
I just escaped the #Napa #earthquake. Everything fell around me and not on me. http://t.co/TF4uhxhfmA
Earthquake at @SilverOak http://t.co/uSfHX2WzBk
1st pics of #earthquake damage in Napa MT @acr What that looked/felt like for in laws in Napa. #earthquake http://t.co/PDoWfwHssx
Will be barrel pickup sticks #napaearthquake http://t.co/4WRYxfJ2vs
Police tape blocks the entrance to the damaged main post office following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Jorge Sanchez looks over damage to the main post office following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Water flows out of McCaulous's department store past a broken storefront window following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Alan Mathison works at cleaning up a broken storefront window following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Jorge Sanchez, left, and Rob Doughty, right, look over damage to the main post office following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
People watch as water flows out of McCaulous's department store following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Gurbir Bhandahl, an employee at a 7-Eleven store, cleans up after an earthquake Sunday, Aug. 24, 2014, in American Canyon, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Rich Pedroncelli)
Cans and bottles litter the floor of cold box at a 7-Eleven store after an earthquake Sunday, Aug. 24, 2014, in American Canyon, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Rich Pedroncelli)
Jean Meehan looks over the damage to her JHM Stamp and Collectibles store following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake caused significant damage in California's northern Bay Area early Sunday, sending at least 70 people to a hospital, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
Gurbeer Singh cleans up merchandise which fell due to an earthquake Sunday, Aug. 24, 2014, at a 7-11 store in American Canyon, Calif. Officials say an earthquake with a preliminary magnitude of 6.0 has been reported in California's northern San Francisco Bay area. (AP Photo/Ben Margot)
A Safeway employee cleans up merchandise which fell due to an earthquake Sunday, Aug. 24, 2014, in American Canyon, Calif. Officials say an earthquake with a preliminary magnitude of 6.0 has been reported in California's northern San Francisco Bay area. (AP Photo/Ben Margot)
Gurbeer Singh cleans up merchandise which fell due to an earthquake at a 7-Eleven store Sunday, Aug. 24, 2014, in American Canyon, Calif. Officials say an earthquake with a preliminary magnitude of 6.0 has been reported in California's northern San Francisco Bay area. (AP Photo/Ben Margot)
This photo provided by Lyall Davenport shows damage to a building in Napa, Calif. early Sunday, Aug. 24, 2014. Officials say an earthquake with a preliminary magnitude of 6.0 has been reported in California's northern San Francisco Bay area. (AP Photo/Lyall Davenport)
NAPA, CA - AUGUST 24: A building is seen destroyed following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3 am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: People wearing bathrobes walk down a street following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3 am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: A building is seen destroyed following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3 am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: A journalist documents a destroyed building following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3 am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: A reporter surveys the scene of a building collapse following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3:00 am on Sunday morning causing damage to buildings and sending at least 70 people to a hospital with non-life threatening injuries. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: Glass from a business litters the ground following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: Glass from a business litters the ground following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: People survey a destroyed building following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: A man takes a picture of a destroyed building following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3am on Sunday morning. (Photo by Justin Sullivan/Getty Images)
Rubble covers the sidewalk in front of the Vintners Collective multi-winery tasting room following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake rolled through California's northern Bay Area early Sunday, damaging some buildings, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness.(AP Photo/Eric Risberg)
Will Wright, left, and Joe Pfeifer, right, clean up the broken windows of a restaurant following an earthquake Sunday, Aug. 24, 2014, in Napa, Calif. A large earthquake rolled through California's northern Bay Area early Sunday, damaging some buildings, igniting fires, knocking out power to tens of thousands and sending residents running out of their homes in the darkness. (AP Photo/Eric Risberg)
NAPA, CA - AUGUST 24: Workers clean up piles of bottles that were thrown from the shelves at Van's Liquors following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3:00 am on Sunday morning causing damage to buildings and sending at least 70 people to a hospital with non-life threatening injuries. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: People survey a damaged car following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3:00 am on Sunday morning causing damage to buildings and sending at least 70 people to a hospital with non-life threatening injuries. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: Police officers prop up a fallen door in front of a damaged buillding following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3:00 am on Sunday morning causing damage to buildings and sending at least 70 people to a hospital with non-life threatening injuries. (Photo by Justin Sullivan/Getty Images)
NAPA, CA - AUGUST 24: A section of the Napa County Court house is seen damaged following a reported 6.0 earthquake on August 24, 2014 in Napa, California. A 6.0 earthquake rocked the San Francisco Bay Area shortly after 3:00 am on Sunday morning causing damage to buildings and sending at least 70 people to a hospital with non-life threatening injuries. (Photo by Justin Sullivan/Getty Images)
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SONOMA, Calif. (AP) - An earthquake with a preliminary magnitude of 6.0 struck California's northern San Francisco Bay area early Sunday, the U.S. Geological Survey said.

The earthquake struck just before 3:30 a.m. about 10 miles northwest of American Canyon, which is about 6 miles southwest of Napa, in California wine country, Leslie Gordon of the U.S. Geological Survey said.

It's the largest earthquake to shake the Bay Area since the 6.9 magnitude Loma Prieta quake in 1989, the USGS said.

The shaking set off car alarms and had residents of neighboring Sonoma County running out of their houses in the middle of night. Officials say widespread power outages have been report in Sonoma County.

A member of Napa County dispatch tells The Associated Press that there has been one report of structural damage, but additional details weren't immediately available.

"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."

There was no immediate report of injuries.

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