Why do scientists prefer the moment magnitude scale to the richter scale

Under what circumstances might the mercalli intensity scale be useful today why was it replaced by the richter and then the moment magnitude scales

Why do scientists prefer the moment magnitude scale to the richter scale is your question Under what circumstances might the mercalli intensity scale be useful today why was it replaced by the richter and then the moment magnitude scales

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It takes place when loosely packed water logged sediments at or near the ground surface lose their strength in response to strong ground shaking.