Learn more about the ShakeAlert message issued for the M 4.9 earthquake - 10.5 mi ESE of Anza, CA at 6:53 pm PT. earthquake.usgs.gov/earthquakes/ev… @Cal_OES @CaltechSeismo @BerkeleySeismo
An @fema WEA Alert was distributed for this earthquake. Currently WEA alerts are only delivered for earthquakes M5 and greater and only to those who could feel light shaking (MMI 4) or greater. If this quake was only M 4.9 why was a WEA delivered?
Check out the ShakeAlert Post-Alert Summary at:earthquake.usgs.gov/earthquakes/ev… and look for the final ShakeAlert message.
The final ShakeAlert message is above a M5
Also - we are getting great news about the performance of #ShakeAlert powered Apps: @MyShakeApp from @BerkeleySeismo and #QuakeAlertUSA from @EarlyWarningLab. Both are currently being tested throughout California. Well done! @Cal_OES
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