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California's statewide Earthquake Early Warning system sent its first alert

More than 40 people received the notification.
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In this Jan. 3, 2019 file photo a mobile phone customer looks at an earthquake warning application on their phone in Los Angeles. ASSOCIATED PRESS

Two months after expanding across California, the state's Earthquake Early Warning system sent out its first real alert, notifying residents of shaking in Monterey and San Luis Obispo counties, along the San Andreas fault. While the quake eventually registered at 4.3 on the Modified Mercali scale, the USGS data shows it was initially estimated at 4.8, high enough to warrant an alert.

According to a project manager quoted by the LA Times, about 40 people received the alert, and it took 8.7 seconds for the alert to go out. In this case, that reached people in the town of Paso Robles, about 22 miles away in enough time to give them about one second of warning. However, that far away the intensity dropped to two on the scale, hardly enough to jostle anyone or cause noticeable damage. If you're near a powerful enough quake, the warnings can come to you via the Wireless Emergency Alert system, or pushed via the MyShake app on iOS and Android.

USGS

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