MS (Surface-Wave Magnitude)
MS (Surface-Wave Magnitude) :
The magnitude of an earthquake determined from surface waves on a seismogram from a teleseismic earthquake (one located more than 20° [~2000 km away). Surface waves are seismic waves that travel over the surface of the Earth, as opposed to those that travel through the Earth, such as P-waves and S-waves. MS magnitudes are measured from surface waves that have a period of about 20 seconds
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