What is an earthquake early warning system?
Quick Answer
An earthquake early warning system detects the first seismic waves of a quake and sends alerts before the strongest shaking arrives. It can give people seconds to tens of seconds to take cover or stop critical systems.
The Full Story
Early warning systems use networks of seismometers to detect fast but weaker P-waves, then estimate the earthquake's location and likely shaking before the slower, stronger S-waves arrive. This can trigger alerts on phones, trains, factories, hospitals, and power systems. Japan's nationwide system and the U.S. ShakeAlert network are major examples. The warning time is brief, but even a few seconds can reduce injuries and damage. These systems do not predict earthquakes in advance; they warn immediately after a quake begins.
Key Facts
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"How phones can warn you before the strongest quake hits"
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