Cell phones buzzed 10 seconds ahead of shaking in Northern California.
The 6.4 earthquake along the far reaches of the Northern California coast didn’t rattle windows or knock items off the shelf in the Bay Area, but it did wake up hundreds — as far south as San Diego — who’d registered for the fledgling earthquake warning system that sends alerts to cell phones.
“It was very helpful in a sense,” Vashisht said later. “We were ready, just in case. We slept very comfortably after that.” “I was really happy to have given individuals an opportunity to drop, cover and hold, or get to a place of safety within that 10-second time frame,” Ghilarducci said at a Tuesday news conference. “The system did operate as we had hoped.”
The alert thresholds vary — wireless emergency cell phone alerts to the general public are triggered at magnitude 5 or greater and a Modified Mercalli Intensity scale of at least IV for light shaking. People also can download private apps that issue alerts at magnitude 4.5 and intensity level III for weak shaking.
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