Earthquake Today: 6.5 Magnitude Strikes Near San Francisco – ShakeAlert Delivers 15-Second Warning

6.5 Magnitude Earthquake Strikes Near San Francisco at 8:47 AM PST

A magnitude 6.5 earthquake struck 12 miles southeast of San Francisco at 8:47 AM PST on June 24, 2026, according to the US Geological Survey. The quake originated at a depth of 8 km, a shallow rupture that amplified ground motion across the region. Shaking lasted approximately 20 seconds and was felt as far north as Sacramento and south to Monterey.

“The shallow depth and proximity to a major urban center make this a significant event, though early reports indicate no immediate casualties,” said USGS seismologist Dr. Emily Zhao.

Initial inspections show minor structural damage, including collapsed chimneys, cracked facades, and scattered debris. Emergency crews are actively assessing bridges and overpasses. Aftershocks in the magnitude 3–4 range are expected over the next 48 hours, with a 5% chance of a larger event.

• The epicenter lies near the San Andreas Fault, a known seismic hazard zone.
• More than 8 million people experienced moderate to strong shaking, per the USGS Did You Feel It? tool.
• PG&E reported isolated power outages affecting roughly 10,000 customers in San Mateo County.

ShakeAlert System Provided 15 Seconds of Warning for the San Francisco Bay Area

The ShakeAlert early warning system detected the fast-moving P-wave within seconds and issued Wireless Emergency Alerts to tens of thousands of phones across the Bay Area. The system, powered by a network of over 1,700 seismic stations, automatically estimated the magnitude and location before the more destructive S-wave arrived.

Fifteen seconds of warning is just enough time to drop, cover, and hold on — but equally valuable is the automated infrastructure it triggers. BART trains slowed to a stop, firehouse doors opened, and hospital elevators locked in place, all without human intervention. These split-second actions reduce injuries and prevent cascading failures.

For a deeper look at how artificial intelligence and sensor networks are revolutionizing earthquake response, read our coverage on California Earthquake: How AI and Early Warning Systems Are Saving Lives and Earthquake in CA: How AI and Sensors Are Improving Early Warnings.

“Every second counts. ShakeAlert bought us critical time, but the public must know how to use it,” said Mark Ghilarducci, director of California’s Office of Emergency Services.

Three Critical Safety Steps Everyone Should Follow During Shaking

When the ground shakes, your instinct may be to run — but experts agree the safest response is a practiced drill: drop, cover, and hold on. The following steps are recommended by the USGS and the American Red Cross.

• Drop onto your hands and knees immediately. This prevents you from being knocked over and allows you to protect vital organs. Avoid doorways unless you are certain the building is well-constructed; they are not stronger than other parts of the frame.
• Cover your head and neck under a sturdy table or desk. If no shelter is available, crawl to an interior wall and cover your head and neck with your arms. Do not stand in a doorway if it means exposing yourself to falling debris.
• Hold on to your shelter until the shaking stops. If the shelter shifts, move with it. Do not try to run outside — falling glass and bricks pose the deadliest risk.

Practicing these steps ahead of time is the single best way to reduce panic. After the shaking ends, check for injuries, gas leaks, and structural cracks. Prepare for aftershocks and keep your phone on silent to avoid overwhelming emergency lines.

Key Takeaways

• Today’s 6.5 quake near San Francisco is a reminder that the region remains seismically active, with the potential for larger events.
• Early warning systems like ShakeAlert can provide precious seconds for protective action, but they are not a substitute for household preparedness.
• The most important immediate actions during an earthquake are to drop, cover, and hold on until the shaking ends.
• Residents are urged to secure heavy furniture, maintain emergency kits with food and water for 72 hours, and establish a family communication plan.
• First responders and structural engineers are currently assessing damage; aftershocks in the magnitude 3–4 range are likely in the coming days.
• Stay informed through official channels such as the USGS Earthquake Hazards Program and local emergency management for the latest updates.