A 3.3-magnitude earthquake bounced southern Sonoma County Monday morning, followed by three smaller quakes in the same area, according to U.S. Geological Survey data.

The quake was felt at least north to Santa Rosa. Some folks in the south county said the first quake was a sharp, quick jolt. There was no report of any damage.

At Kenilworth Junior High School in Petaluma, Jackie Watt was working in the kitchen at the time.

"It almost sounded like a plane landed on the roof," said Watt.

Her rolling work chair shifted a few inches and her computer screen jiggled back and forth.

"It got louder and louder," Watt said. "Everything rattled in the kitchen."

The U.S. Geological Survey reported the minor quake was centered about three miles southeast of Cotati and Rohnert Park.

The first quake struck at 10:42 a.m. At 1:10 p.m. another hit in the same area, registering 2.0. That was followed by a 1.9-magnitude quake at 1:37 p.m. and a 1.5-magnitude burp at 1:42 p.m.

The four quakes were not on the Rodgers Creek fault, one of the better-known earthquake faults snaking through Sonoma County.

"These are on unknown small faults" in the area, said David Schwartz, a geologist with the USGS.

"If these had happened on the Rodgers Creek fault there would have been a heightened sense of 'hmm, interesting,'" said Schwartz. "Small earthquakes like this just kind of occur almost randomly throughout the Bay Area. It doesn't signify anything."

Source: The Press Democrat