noun
seismic moment
A geophysical measure of the energy released by an earthquake, used in seismology.
地震モーメントは断層のずれの大きさから計算される。
The seismic moment is calculated from the size of the fault slip.
マグニチュード is a logarithmic scale derived from seismic moment, commonly used in news reports, while 地震モーメント is the direct physical quantity.
Compound of 地震 (earthquake) and モーメント (moment, from English 'moment').