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In the past,seismic intensity was estimated from a compilation of human perception and the resultant casualties.
Since 1 April 1996, it has been measured automatically with seismic intensity meters and announced rapidly to the public and officials. There are about 600 JMA seismic intensity observation stations throughout Japan as of April 1996

Because "intensity 5" or "intensity 6" didn't necessarily correspond to the same degree of damage, "intensity 5" and "intensity 6" have been divided into two scales : "intensity 5 Lower" and "intensity 5 Upper" and "intensity 6 Lower" and "intensity 6 Upper" respectively, since 1 October 1996. The intensity is now divided into 10 scales as a result

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