A swarm of at least six earthquakes reaching up to magnitude 2.9 rattled San Ramon near San Francisco, the U.S. Geological Survey reports.
The other quakes in the Saturday, Dec. 13, swarm ranged from magnitude 1.3 to 2.3, according to the USGS.
San Ramon earlier was hit by a swarm of more than 90 quakes starting Nov. 9, The Sacramento Bee previously reported…