Loma Prieta Earthquake Strikes California
The San Andreas Fault system had been quiet in the Loma Prieta segment for decades. On October 17, 1989, at 5:04 p.m. local time, a magnitude 6.9 earthquake struck near Loma Prieta Peak in the Santa Cruz Mountains. The shaking lasted 15-20 seconds and was felt across the San Francisco Bay Area. It collapsed sections of the Bay Bridge and a freeway overpass, killing 63 people and injuring thousands. Property damage exceeded $5 billion. The event interrupted the World Series broadcast from Candlestick Park.
Why it matters: As the strongest quake to hit the region since 1906, it led to major retrofitting of infrastructure, updated building codes, and heightened public awareness of seismic risks in California, influencing preparedness policies nationwide.