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.

Source: Los Angeles Times February 23, 2018 22:18 UTC