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Grade

Conventional unit characterizing the earthquake on its manifestations on the surface of the Earth (the intensity of ground shaking on the earth's surface). There are several seismic intensity scale in detail or significantly different from each other - Mercalli, Medvedev, Rossi-Forel, and others. The former Soviet Union used a 12-grade international European MSK-64 scale. Conditionally divided into weak earthquakes (1-4 grade ), severe (5-7 grade ) and highly destructive (8 grades or more).

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