Answer :
The seismic moment of an earthquake is 405,000. Seismologists use a quantity called seismic moment to calculate the magnitude of an earthquake.
Thus, M 0 has torque dimensions that are expressed in newton meters. In the body-force equivalent description of seismic sources as a double-couple (a pair of force couples with opposite torques), the relationship between a seismic moment and a torque is obvious: the seismic moment is the torque of each of the two couples. Seismic moment is not a measure of energy despite having the same dimensions as energy. Indirect and approximate relationships exist between the seismic moment, potential energy decrease, and radiated energy. In order to constrain its variables, the seismic moment of an earthquake is often approximated using the information at hand. Seismograms, which are recordings of an earthquake's ground motion, are typically used to determine the moment for contemporary earthquakes.
The equation M0 = DAμ, where D is the average fault displacement, A is the total area of the fault surface, and is the average stiffness (with regard to shearing forces) of the rocks in the fault, can be used to calculate the seismic moment, M0.
M0 = DAμ
M0 = 30*15*30*30
M0 =405,000
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