The nation's first publicly available earthquake early warning mobile app was launched earlier this year as part of a pilot program designed to give Los Angeles County residents a few seconds of warning before the shaking, NBC reports.
Graves said the ShakeAlert system provided 48 seconds of warning to the seismology lab well before the shaking arrived at Caltech in Pasadena, just northeast of Los Angeles.
Los Angeles Mayor Eric Garcetti said in a tweet, "The #ShakeAlertLA app only sends alerts if shaking is 5.0+ in LA County. Epicenter was 6.4 in Kern County, @USGS confirms LA's shaking was below 4.5. We hear you and will lower the alert threshold with @USGS_ShakeAlert."ShakeAlert warnings are issued for all quakes, including aftershocks, of magnitude-5.0 or greater. The alert includes a sound and message that indicates the anticipated intensity level.
Seismologist Lucy Jones speaks at a media briefing at the Caltech Seismological Laboratory in Pasadena, California following the 6.4 Searles earthquake near Ridgecrest about 150 miles north of Los Angeles, July 4, 2019.The early warning function only works in Los Angeles County. The app does not need to be open, but users must set the phone's location services to "Always On.
There's still work to do. The sensor network is only about 50 percent of the target size. Funding has been secured to complete the network in California in the next two years.
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