How is Moment Magnitude (MW ) calculated?
A) from surface wave magnitude measured one minute after the first P-wave arrival
B) from the amount of building or other infrastructure damage in large earthquakes with more than one minute of of ground shaking
C) from average fault displacement, average fault rupture area, and rock shear strength in the fault zone or by measuring very long period waves on special long period seismometers, triggered to record only very large earthquakes
D) from S-wave magnitude measured one minute before the last P-wave arrival
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