Bay Area earthquake came with early warning for 2.1 million ShakeAlert app users
LA TimesA student from Everett Middle School participates in the Great California ShakeOut earthquake drill on Oct. 20 in San Francisco. Many San Francisco Bay Area residents were given several seconds’ warning before the shaking arrived from a magnitude 5.1 earthquake that struck under the mountains east of San Jose this week. The activation of the U.S. Geological Survey’s ShakeAlert system is the second time in six weeks that Bay Area residents got a warning before they felt shaking. “Here in Berkeley, I got an early warning 10 seconds before the shaking reached us from the M5.1 earthquake in San Jose,” Stefan Lasiewski tweeted. There are several apps available on smartphones that can carry the alerts in California triggered by the USGS’ ShakeAlert system, and all are free to use: MyShake, developed by UC Berkeley; QuakeAlertUSA, developed by Santa Monica-based Early Warning Labs; and ShakeReadySD, an app developed for San Diego County but works statewide.
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