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FLJapan operates the world's most advanced earthquake early warning system, run by the Japan Meteorological Agency and active since 2007.
The system works by detecting fast-moving P-waves first, which are harmless, and sending out alerts before the destructive S-waves arrive. Over 4,000 seismometers are installed across the country, and alerts reach phones, televisions, and public speakers within 5 to 8 seconds of detection.
During the 2011 Tohoku earthquake, people in Tokyo received up to 15 seconds of warning — enough time for bullet trains to halt, factories to shut down assembly lines, and millions to take cover.
Studies show that even 10 seconds of warning reduces injury risk by nearly 40 percent. No other country in the world has built this level of earthquake preparedness into everyday life the way Japan has.
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