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10-Second Warning Before Earthquake

Ten seconds before the magnitude 6.0 Napa earthquake shook the San Francisco Bay Area on Sunday morning, the ShakeAlert system at the UC Berkeley already knew that it was coming. A ten-second warning may not seem like much, but it's enough time for elevators to stop at the next floor and open up, for high-speed trains to slow down and avoid being flung off the tracks, for surgeons to halt operations before the walls start shaking, and for you to take cover under the nearest table just in case the roof caves in. #tech


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