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/id1445922632)Android: 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). Get full access to Rich on Tech at richontech.tv/subscribe) See omnystudio.com/listener) for privacy information.