Depending on a person's distance from the earthquake's epicenter, the alert may reach them before the earthquake's slower moving (but destructive) S waves do. It does this by detecting an earthquake's fast moving (but weak) P waves, then computes the event's location and estimated magnitude, after which it issues the warning. Similar to other earthquake early warning systems, ShakeAlert does not predict earthquakes, but rather it attempts to quickly identify a seismic event and issue an alert before widespread shaking is felt. It is expected that the system will be expanded to other seismically active areas of the United States in the future. As of 2021, the system issues alerts for the country's West Coast (specifically the states of California, Oregon and Washington). ShakeAlert is an earthquake early warning system (EEW) in the United States, developed and operated by the United States Geological Survey (USGS) and its partners. ![]() ![]() ![]() An animation detailing how ShakeAlert functions For the general topic of "shake alerts", see earthquake early warning system.
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