A 6.0 earthquake shook Sonoma Valley at 3:20 a.m. Sunday.
A preliminary indication from the USGS showed that it was centered 4.2 miles northwest of American Canyon in Napa County.
Fire alarms were going off all over the Valley. Power went off momentarily, but came back on immediately in Agua Caliente. Power was off, with the exception of the stoplights, south of Fetters Avenue all the way through Sonoma.
Sonoma Valley Fire and Rescue Authority Division Chief Bob Norrbom said the department had been responding to fire alarms that went off and to some medical runs, but he hadn't heard of anything major. Sonoma Valley, Schell-Vista and Glen Ellen fire departments sent water tankers to Napa County because of the number of broken water mains there.
According to the City of Sonoma, Sonoma police and fire are not reporting any significant damage or injuries at this time. Public Works reports water system has not sustained any damage and is operational.