Several magnitude 2 and 3 earthquakes rumbled through the San Francisco Bay Area on Friday. It’s the latest seismic activity to add to a swarm of 60 earthquakes greater than magnitude 1 to hit the Danville area in the past week. The largest in the sequence, a magnitude 3.6 earthquake, came at 12:19 p.m. Friday. The U.S. Geological Survey received reports from more than 1,000 people who said they felt the quake, extending from the East Bay and into San Francisco. The quake was quite shallow, less than a third of a mile under the surface of the earth. A magnitude 2.8 aftershock was felt two minutes later.
We should expect it to have large earthquakes in the future, such as a magnitude 6 or 7. Farther south, parts of the Hayward and Calaveras faults merge south of San Jose.