User:Niko Iwamura/sandbox
From Wikipedia, the free encyclopedia
Earthquake Early Warning (EEW), or 緊急地震速報 (きんきゅうじしんそくほう) in Japanese, is an earthquake early warning system designed to issue alerts several seconds to several tens of seconds before a large earthquake tremor reaches an area. It is provided by the Japan Meteorological Agency as a forecast and warning.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/6/61/Earthquake_Early_Warning_%28Japan%29-en.png/640px-Earthquake_Early_Warning_%28Japan%29-en.png)
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The system began partial trial operations in 2004 and full operations targeting almost all residents of Japan, except for some remote islands, began on October 1, 2007.
There are two types of warnings issued: "for the general public" (seismic intensity warning, special seismic intensity warning) which is announced when the expected seismic intensity is weak 5 or higher, and conveys "the areas where strong tremors of seismic intensity 4 or stronger will occur," and "for advanced users" (seismic motion forecast) which has a high speed of response but has lower accuracy for the first report with a lower announcement criterion, and can provide various information such as "the reach time of earthquake waves and tremors in each area."