A new calculation conducted in recent weeks at the U.S. Geological Survey shows that there’s an extremely remote chance the San Andreas could be triggered from the Ridgecrest quakes.
of a magnitude 7.8 earthquake on the San Andreas fault that could kill 1,800 people, injure 5,000, displace some 500,000 to 1 million people from their homes and hobble the region economically for a generation. That quake would send strong shaking into Los Angeles, Orange, Riverside, San Bernardino, Kern and Ventura counties almost simultaneously.
The San Andreas is the main plate boundary between the mammoth Pacific and North American plates, and is a key dividing line moving southwestern California — encompassing cities like Half Moon Bay, Santa Cruz, Monterey, Santa Barbara, Los Angeles and Anaheim — toward Alaska. The other side, with cities like San Francisco, Sacramento, Fresno and Las Vegas, is moving, relatively speaking, toward where Mexico is today.
Over the course of centuries, the San Andreas fault moves at a breathtaking speed compared to most California faults — the speed at which fingernails grow, and much faster than most other faults. GPS sensors show that Mission Viejo in Orange County and Twentynine Palms in the Mojave Desert are moving away from each other about 1.2 inches annually, relatively speaking, according to UNAVCO, a nonprofit university-owned consortium.
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