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Observation of seismic intensity

Japan Meteorological Agency has observed the seismic intensity of the earthquake since 1884 (Meiji 17).

They had observed it by bodily sensation until April, 1996 (Heisei 8), but they have stopped such observation and have used the seismic intensity meter, which was invented in 1991 (Heisei 3), due to objectify the observation and announce it quickly.

Ten scales of the seismic intensity have been adopted since October, 1996 (Heisei 8).