The first major earthquakes hit Southern California since the launch of an early warning app for people who live in Los Angeles. Robert de Groot of the USGS explains what went as planned and where there is room for improvement.ShakeAlertLA AppiOS: https://apps.apple.com/us/app/shakealertla/id1445922632Android: https://play.google.com/store/apps/details?id=com.app.shakealertla&hl=en_US
USGS on Twitter:https://twitter.com/USGS_ShakeAlert See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.

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