"How an Earthquake alert app could eventually give the West Coast vital warning" PBS NewsHour 8/8/2018

Excerpt

SUMMARY:  West Coast residents go about life knowing seismic threats are lurking, but there's a lot that people can do before an earthquake hits if they have even a few seconds of warning.  A system called "ShakeAlert" picks up seismic information streaming in from sensors, and there's a big push this year to distribute the alerts more widely.  Special correspondent Cat Wise reports from Seattle.