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How is an Earthquakes Magnitude Determined?

April 26, 2017earthquake magnitude

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How is an Earthquakes Magnitude Determined?

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In order to determine the magnitude of an earthquake, we examine seismograms recorded by at least three different seismic stations. We measure the amplitude of the S wave on each seismogram, and correlate it with the distance between the station and the earthquake using a graph called a nomogram.