What instruments are used to measure the strength of earthquakes?

An earthquake has one magnitude unit. The magnitude does not depend on the location where measurement is made. A seismograph is the primary earthquake measuring instrument. The seismograph produces a digital graphic recording of the ground motion caused by the seismic waves. The digital recording is called a seismogram. the earthquake magnitude scale was the Richter scale, a mathematical formula invented by Caltech seismologist Charles Richter to compare quake sizes.

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