CNN) -- A 6.1-magnitude earthquake struck Northern California early Sunday, the U.S. Geological ****** 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.
CNN affiliate KTVU reported a church in Vallejo was heavily damaged and lost its bell tower.
There were no immediate reports of injuries.
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.
CNN's Augie Martin, who lives in San Francisco, described the earthquake as "the softest, most rolling 6.0 earthquake I've ever felt. It was obvious -- no doubt. But living in the city proper, it was more of a roller than a sharp jolt."