This system is called Earthquake Early Warning (EEW) actually, the principle was not different from other countries. The vibration tester in the sea. Around the coast country and meter in the nationwide.It will send the information to a Realtime earthquake department of Meteorology of Japan in the closest point. The alarm signal to the TV station and radio mobile provider nearby.Before the other), then be forwarded to the Department of meteorology, throughout the country to the warning information send go very fast. Take 5-15 minutes, it warned the country)
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