The Japan Meteorological Agency (JMA) started an earthquake early warning system since 2007. However I didn't know what it was and how it worked before 2011/03/11.
This system gives us alarming buzzer through our mobile phone. The sound is very scary and make us feel uneasy. Mostly after 10 seconds we hear the buzzer, earthquake will come.
We have already had over 30 times this alarm since 3/11. This is a great invention, but very scary. Please check following movie and listen to the sound that we often hear recently.
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