"Your Guide to Earthquake Safety"
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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).
The seismic intensity meter has made it possible to observe the seismic intensity objectively, and the uninhabited observation has stepped up the establishment at various places.
And the automatic control has made it possible to decrease the time from the observation to the announcement.
Therefore, the introduction of the seismic intensity meter has various merits.
Measurement unit
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This unit observes the quake and changes it to the electric signal.
Processing unit
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This unit calculates the seismic intensity from the electric signal and shows the result on the display.
There are about 4200 observation points, where Japan Meteorological Agency uses for the announcement of the seismic intensity information.
These seismic intensity meters are maintained and administered by Japan Meteorological Agency, the local governments for the prefectures, and National Research Institute for Earth Science and Disaster Prevention (NIED).
The observation data is transferred to the weather stations, the prefecture capitals and NIED by the telephone line and the government disaster prevention radio, and is treated there. The result is offered to Japan Meteorological Agency within several minutes after earthquake.
