A 6.5 magnitude earthquake hit near San Francisco at 8:47 AM PST today. Learn about the impact, early warning system, and essential safety tips.
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 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.
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.
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.