According to the USGS, the first temblor rattled an area around The Geysers at 9:30 p.m. Monday night. That quake was centered two miles north-northeast of The Geysers with a depth of 2.1 miles, according to the USGS
The second struck area of unincorporated Sonoma County one mile north-northeast of Glen Ellen at 1:08 a.m. Tuesday. It was centered near the Lasseter Family Winery along Dunbar Road, and had a depth of 1.6 miles, according to the USGS.
Bay City News contributed significantly to this report