How is the magnitude of an …

The Richter magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included for the variation in the distance between the various seismographs and the epicenter of the earthquakes.

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Gaurav Seth 5 years ago

A device called Seismograph is used to record seismic waves produced during earthquakes on the surface of the earth. The purpose is to measure the motion or movement of ground during an earthquake
The power of an earthquake is expressed in terms of a magnitude on a scale called Richter scale.
Destructive earthquakes generally have a magnitude of greater than 7 or 7.5. Earthquakes of magnitude 5-7 are moderate and below 5 are small or negligible.

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