A minor, 3.9-magnitude earthquake struck in the San Francisco Bay Area on Monday, according to the United States Geological Survey. The temblor happened at 7:46 p.m. Pacific time about 3 miles northwest of Dublin, Calif., data from the agency shows. U.S.G.S. data earlier reported that the magnitude was 4.

Moderate shaking was reported with a magnitude 3.9 earthquake near Dublin, Calif. Residents in San Francisco, Fremont and Richmond reported weak shaking.

In Northern California, a magnitude 3.9 earthquake struck near Dublin at 7:46 p.m. on Monday, March 18. The quake was centered about 4.6 km west of Dublin, according to USGS. An aftershock measuring 2.9 magnitude followed in the same area at 9:46 p.m., reinforcing the seismic activity in the region.