Glossary of earthquake terms
Moment = µ A D
µ = shear modulus = 32 GPa in crust, 75
GPa in mantle
A = LW = area
D = average displacement during rupture
|
Seismic moment
The seismic
moment is a measure of the size of an earthquake based on
the area of fault rupture, the average amount of slip,
and the force that was required to overcome the friction
sticking the rocks together that were offset by faulting.
Seismic moment can also be calculated from the amplitude
spectra of seismic waves.
|
|