The Japan Meteorological Agency (JMA) magnitude scale, often referred to as JMA magnitude (Mj), is a scale used to quantify the size or magnitude of earthquakes, specifically in Japan. It is based on the amplitude of seismic waves recorded by seismographs. The JMA scale is similar to other magnitude scales, like the Richter scale, but it is specifically tailored to account for the geological characteristics of Japan and the complexities of seismic activity in the region.
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