4.3 Magnitude Earthquake Shakes Bay Area – Centered in Berkeley, Felt Across San Francisco and Oakland

Residents across the San Francisco Bay Area woke up early Monday morning after a magnitude 4.3 earthquake struck near Berkeley, California. The quake, originally measured at 4.6 before being revised by the USGS (United States Geological Survey), rattled homes and caused widespread alerts but no reports of major damage.

When and Where the Earthquake Happened

• Time: 2:56 a.m. PDT, September 22, 2025
• Epicenter: Near Dwight Way and Piedmont Avenue in Berkeley, CA, close to the Hayward Fault
• Depth: About 4.8 miles (7.8 km)

This location is one of the most seismically active areas in California, making it a reminder of the Hayward Fault’s potential risk to millions of Bay Area residents.

Who Felt the Earthquake

Reports of shaking came in from:

• Berkeley, Oakland, and Alameda – where the tremor was strongest
• San Francisco (SF) – across neighborhoods from downtown to the Sunset District
• Richmond, Walnut Creek, and San Leandro
• As far as Salinas and Santa Cruz

Many Bay Area residents described the quake as a “sharp jolt” that woke them up suddenly.

Impact on the Bay Area

• No major damage or injuries have been reported so far.
• Items fell off shelves in some Berkeley and Oakland homes.
• The ShakeAlert earthquake early warning system was triggered, giving some residents a few seconds of notice.
• BART trains ran at reduced speeds while safety checks were carried out, causing delays across the system.

Bay Area Earthquake Context

The Hayward Fault, which runs directly through Berkeley, Oakland, and Fremont, is considered one of the most dangerous in the U.S. A quake of magnitude 4.3 is classified as moderate, but scientists warn that a much larger earthquake is overdue on this fault.

According to the USGS, there is a low chance of strong aftershocks, but residents should remain alert over the coming days.

Earthquake Preparedness: What Residents Should Do

Living in California, especially in the Bay Area, means being earthquake-ready. Experts advise:

1. Drop, Cover, and Hold On during shaking.
2. Keep emergency kits stocked with water, food, and first aid supplies.
3. Secure heavy furniture and shelves to prevent injuries.
4. Stay updated with official alerts from USGS, KRON4, and KTVU News.
5. Review household safety plans in case of a larger California earthquake.

Why This Matters for California

While the Berkeley earthquake today did not cause severe damage, it is a reminder that the Bay Area, including San Francisco, Oakland, and Alameda, sits on multiple active fault lines. The Hayward Fault in particular is capable of producing a destructive quake that could affect millions.