Attenuation 31
Attenuation 31 : When you throw a pebble in a pond, it makes waves on the surface that move out from the place where the pebble entered the water. The waves are largest where they are formed and gradually get smaller as they move away. This decrease in wave amplitude is caused by geometrical spreading and by attenuation of seismic wave energy. The latter is due to two different processes: (1) (a) absorption (termed anelastic attenuation) in different Earth materials and (b) scattering of seismic energy at heterogeneities in the Earth (e.g., faults or small-scale anomalous geological bodies). Q and kappa are attenuation parameters used in modeling the attenuation of ground motions
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