Two months after expanding across California, the state’s Earthquake Early Warning system sent out its first real alert, notifying residents of shaking in Monterey and San Luis Obispo counties, along the San Andreas fault. While the quake eventually registered at 4.3 on the Modified Mercali scale, the USGS data shows it was initially estimated at 4.8, high enough to warrant an alert.
For more info, please read the original article by Engadget:
https://www.engadget.com/2019/12/19/myshake-earthquake-alert/
