Video clip showing the current MyShake push notification that Hellweg received during the magnitude-4.5 Pleasant Hill earthquake. It includes a verbalized warning from the app that, Hellweg explains, is triggered as soon as the push notification is received. Credit: MyShake (https://myshake.berkeley.edu/)

Video clip showing the current MyShake push notification that Hellweg received during the magnitude-4.5 Pleasant Hill earthquake. It includes a verbalized warning from the app that, Hellweg explains, is triggered as soon as the push notification is received. Credit: MyShake (https://myshake.berkeley.edu/)

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