The magnitude of an earthquake, usually expressed by the Ritcher scale, is a measurement of the amplitude of the siesmic waves. The moment the magnitude of an earthquake is a measure of the amount of energy released - an amount that can be estimated by the siesmograph.
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Answer:
Siesmic waves
Explanation:
The magnitude of an earthquake, usually expressed by the Ritcher scale, is a measurement of the amplitude of the siesmic waves. The moment the magnitude of an earthquake is a measure of the amount of energy released - an amount that can be estimated by the siesmograph.