A magnitude 3.2 earthquake struck early Monday morning in Sonoma County, the US Geological Survey said.
The earthquake was reported at 5:22 a.m., centered more than 25 miles northeast of Healdsburg or more than 30 miles north of Windsor, the science agency said.
The quake had a depth of more than half a mile, the USGS said.
No damage has been reported in connection with the earthquake.