An infographic showing how the ShakeAlert EEW system works. ShakeAlert Is Not Earthquake Prediction. This cartoon showing that the earthquake has already started when the ShakeAlert message is distributed. Credit: USGS (Public domain).

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An infographic showing how the ShakeAlert EEW system works. ShakeAlert Is Not Earthquake Prediction. This cartoon showing that the earthquake has already started when the ShakeAlert message is distributed. Credit: USGS (Public domain).

An infographic showing how the ShakeAlert EEW system works. ShakeAlert Is Not Earthquake Prediction. This cartoon showing that the earthquake has already started when the ShakeAlert message is distributed. Credit: USGS (Public domain).

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