4.3 Magnitude Earthquake Jolts San Francisco Bay Area, Centered Near Berkeley

Early Morning Tremor Shakes Bay Area

A magnitude 4.3 earthquake rattled the San Francisco Bay Area early Monday, September 22, 2025, at 2:56 a.m. PDT, waking residents across the region. The United States Geological Survey (USGS) initially reported higher magnitudes before revising it to 4.3. The epicenter was located near Berkeley, specifically east-southeast of the city, close to the University of California campus on Dwight Way near Piedmont Avenue, and along the active Hayward Fault. The earthquake occurred at a depth of approximately 4.8 miles.

Widespread Shaking and Minor Impacts

The seismic event was widely felt, with over 30,000 people reporting the shaking on the USGS website. Residents as far north as Santa Rosa and Sacramento, and south to Santa Cruz and Salinas (approximately 100 to 160 kilometers from Berkeley), experienced the tremor. While the earthquake was strong enough to cause items to fall from shelves and scare pets, official reports indicated no major injuries or significant structural damage. However, some minor damage was noted in Berkeley, including a display window shattered at a butcher shop and merchandise tumbling from store shelves.

Emergency Response and Transportation Delays

Following the quake, the San Francisco Fire Department and the city's Department of Emergency Management confirmed they received an increase in calls but no reports of injuries or major damage. As a precautionary measure, Bay Area Rapid Transit (BART) implemented reduced speeds for its trains to allow for safety inspections of the tracks. This led to systemwide delays of up to 20 minutes, though normal service resumed later in the day.

Seismic Context and Future Outlook

This 4.3 magnitude earthquake marks the most powerful to affect the Bay Area in three years, since a magnitude 5.1 quake struck near Mt. Hamilton in October 2022. USGS seismologist Sarah Minson characterized it as a 'small earthquake,' stating that structural damage would generally not be expected from an event of this magnitude. The proximity to the Hayward Fault, known as one of the Bay Area's most dangerous, serves as a reminder of the region's seismic activity. The USGS also indicated a 24% risk of an aftershock of magnitude 3.0 or greater within the next week, and a 3% chance of a magnitude 4.0 or greater. An earthquake early warning system successfully issued an alert following the event.