San Ramon quake swarm continues with 3.1 shaker

A preliminary 3.1 magnitude earthquake centered about a mile from San Ramon shook the Bay Area Sunday afternoon, according to the U.S. Geological Survey.

The earthquake struck at 3:31 p.m. along the Calaveras Fault, which intersects the Hayward Fault, USGS officials said.

UPDATE Monday 5:31 p.m. 16 additional small earthquakes of magnitude 2.0 or greater have struck the San Ramon area today, including a 3.5 temblor at 3:21 p.m. Monday afternoon.

This afternoon’s quake is just one of many that have struck the area in roughly the last 10 days, according to USGS officials.

A 3.4 preliminary magnitude quake centered near San Ramon struck Thursday at 6:10 a.m., USGS officials said.

People as far away as Vallejo and Sunnyvale felt the temblor, according to USGS officials.