SAN FRANCISCO BAY AREA, CA — The Bay Area was rattled by an earthquake Monday night, initially recorded as a magnitude 4.2 event, before being downgraded to 4.0. The tremor struck at 7:46 p.m., with the epicenter located in Dublin, according to the United States Geological Survey (USGS). The earthquake, which occurred along the Calaveras Fault, was felt across the region but caused no reported injuries or significant damage.
By 8:15 p.m., the magnitude was further revised to 3.9, with seismic activity tapering off as the night continued. The earthquake was described by many in the area as a sharp jolt rather than a rolling sensation, which is often associated with larger seismic events.
Following the initial quake, the region experienced a series of aftershocks, with four registering above magnitude 2.0. These occurred at 7:53 p.m., 8:10 p.m., 8:20 p.m., and 8:22 p.m. The largest aftershock was measured at magnitude 2.3. The aftershocks were felt mostly in the East Bay and Peninsula areas.
The Calaveras Fault, which runs through Dublin and nearby towns such as Alamo, Danville, and San Ramon, has a history of seismic activity, though quakes of this size are not uncommon. The USGS encourages those who felt the tremor to report their experiences through the “Did You Feel It?” section of its website, which helps track the impact of earthquakes on local communities.
As of 8:30 p.m., authorities confirmed that no major damage or injuries had been reported, and normal operations continued across the affected areas. However, residents in the East Bay and Peninsula areas were urged to stay alert as aftershocks could continue in the coming hours.
The earthquake serves as a reminder of the region’s seismic risk, and experts continue to monitor the area for further activity.