early warning

Monday’s magnitude 5.2 temblor marked another success for California’s earthquake early warning system, with users in some areas saying they received alerts on their phones before they felt shaking.

People in Camarillo, Manhattan Beach, Palm Springs, Riverside, the San Diego neighborhood of Rancho Peñasquitos, Santa Ana and southern Orange County said they got the earthquake early warning before the shaking started, according to posts on social media and in interviews with local news outlets.

California’s free earthquake early warning app, MyShake, is now available for Mac computers and Chromebooks — a major expansion of access for the warning system.

Geologists at the California Geological Survey’s office in Los Angeles also received early warning notifications on their phones “so we were prepared for some shaking,” one scientist posted on social media.

Android phones also have a built-in earthquake early warning app.