Richter Scale 10
Richter Scale 10 : Devised by C.F. Richter in 1935, an index of the seismic energy released by an earthquake (as contrasted to intensity that describes its effects at a particular place), expressed in terms of the motion that would be measured by a specific type of seismograph located 100 km from the epicentre of an earthquake. Nowadays several "magnitude scales" are in use. They are based on amplitudes of different types of seismic waves, on signal duration or on the seismic moment. (UN DHA)
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