We want to update you on yesterday’s M5.8 earthquake 11mi SSE of Lone Pine, CA. The #ShakeAlert-powered Apps and @fema WEA delivered alerts to thousands of people in Southern California. #QuakeAlertUSA @MyShakeApp @Cal_OES @EarlyWarningLab
(1/6)
(1/6)
Since October of 2019 the Wireless Emergency Alert (WEA) system and Apps have been undergoing the testing of public alerting in California. One advantage of WEA is that it can broadcast a single message to many people without overwhelming the cellular system. (2/6)
#ShakeAlert works very quickly and the first estimate of the earthquake’s size was M5.0, big enough to alert people by WEA and Apps. As the earthquake grew in size #ShakeAlert issued updates to a growing area. (3/6) earthquake.usgs.gov/earthquakes/ev…
As #ShakeAlert updates were issued, the delivery channel backed-up slowing down delivery of WEA alerts to cell phones. It’s likely the farther away you were from the earthquake epicenter the longer it took for you to get the alert. (4/6)
We understand that this event was upsetting for many people especially those who might have received an alert minutes after the M5.8 event. This is the first time we’ve seen this happen and USGS is working with the delivery channel operator to solve the issue. (5/6)
We appreciate your patience and understanding. To learn more about using WEA for earthquake early warning visit: shakealert.org/implementation… (6/6)
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