Seismic moment
Seismic moment is a quantity used by seismologists to measure the size of an earthquake. The scalar seismic moment M 0 {\displaystyle M_{0}} is defined by the equation M 0 = μ A D {\displaystyle M_{0}=\mu AD} , where μ {\displaystyle \mu } is the shear modulus of the rocks involved in the earthquake (in pascals (Pa), i.e.