An earthquake measuring at a preliminary magnitude of 4.3 shook Sonoma County on Saturday morning around 9:22 a.m., according to the U.S. Geological Survey.
The temblor struck about 3.7 miles north-northwest of the Geysers, close to Healdsburg in the North Bay. Originally the quake was measured at a preliminary magnitude of 3.9 but that was revised to a preliminary 4.3 later in the morning by the USGS.
While the quake’s epicenter was in a relatively rural area, the shaking was felt by people in the wider Bay Area, including San Francisco, Novato and Napa, according to the USGS community map…