Discussion
In seismology, the moment magnitudes are calculated by :
Answer: C
Seismic moment is Slip × Area × Elastic Modulus.
The seismic moment of an earthquake is the product of the rigidity (shear modulus) of the rock, the area of the fault that ruptured and the average slip on it:
\[ M_{0} = \mu A D \]
The moment magnitude is then calculated from the logarithm of \(M_{0}\). Slip times modulus leaves out the rupture area. The other two options use the P-S arrival time or amplitude, which belong to locating an earthquake or to the older Richter magnitude, not to the moment magnitude.
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