The Japan Meteorological Agency seismic intensity scale is a seismic scale used in Japan and Taiwan to measure the intensity of earthquakes. It is measured in units of shindo (震度?, seismic intensity, lit. "degree of shaking"). Unlike the moment magnitude scale (formerly Richter scale), which measures the energy released by the earthquake, the JMA scale describes the degree of shaking at a point on the Earth's surface, and is analogous to the Mercalli intensity scale. The intensity of an earthquake is not totally determined by its magnitude, and varies from place to place; for example, a quake may be described as "shindo 4 in Tokyo, shindo 3 in Yokohama, shindo 2 in Shizuoka".
The JMA operates a network of 180 seismographs and 627 seismic intensity meters and provides real-time earthquake reports to the media and on the internet.
Read more about Japan Meteorological Agency Seismic Intensity Scale: History, Scale Explanation
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