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Hi everyone, it’s #ReseachFriday! This week’s focus is on #ShakeAlert alerting regions! This study looked at using the 2019 Ridgecrest earthquakes to find an optimal alerting strategy. pubs.geoscienceworld.org/ssa/bssa/artic…
So, the #ShakeAlert system detects an earthquake, it uses ground motion models (GMMs) to determine the size of the alert region using earthquake source estimates as input (generally, magnitude and location). 
The authors first found which GMM predicts shaking intensities that match the average observed intensity with distance from USGS Did You Feel It? (DYFI?) reports on the Ridgecrest earthquakes. Here's the DYFI map from the M7.1 Ridgecrest earthquake.
