(CNN) — A 6.1-magnitude earthquake struck Northern California early Sunday, the U.S. Geological Survey said.
It was the strongest to hit the Bay Area since 1989, when a quake struck during the World Series.
Sunday's earthquake struck 4 miles northwest of American Canyon, 6 miles southwest of Napa, and 9 miles southeast of Sonoma, according to the USGS.
"I've got a lot of broken wine, being here in Napa," said Emily Massimi, who was woken up by the quake. "We tend to collect wine, so I have wine all over my kitchen, and glass, and pictures off the wall and books off of bookshelves," she told CNN.
There were no immediate reports of injuries, but 15,000 customers in and around Sonoma, Napa, and Santa Rosa lost power, according to Pacific Gas and Electric Company
"The refrigerator flew open and all the food fell out," said Karen Lynch, who lives in downtown Napa.
"Everyone is outside. Everyone is checking on neighbors. This is a close community, everyone wants to help."
CNN affiliate KTVU reported a church in Vallejo was heavily damaged and lost its bell tower.
The USGS estimated, based on their locations, that 15,000 people experienced severe shaking, 106,000 people felt very strong shaking, 176,000 felt strong shaking, and 738,000 felt moderate shaking.
"It was not like other quakes we have felt," Lynch told CNN. "This was a violent quake, jolting us to and fro."
There have been two aftershocks so far, according to the USGS, one registering at 2.5 and the other a 3.6 magnitude.
Napa County Fire Capt. Jim Christenson said units were driving around looking for damage.
A dispatcher for the Napa County Sheriff's Office said there was some water damage.
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