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PBS News Hour
Earthquake alert app could give the West Coast vital warning
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.
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