Attenuation 29
Attenuation 29 :
Waves are largest where they are formed and gradually get smaller as they move away from their generating source. The decrease in wave amplitude is caused by geometrical spreading and by attenuation of wave energy. The latter is due to two different processes: (1) (a) intrinsic attenuation (also termed anelastic attenuation or absorbtion) in different Earth materials and/or (b) scattering of seismic energy at heterogeneities in the Earth (e.g., faults or small-scale anomalous geological bodies; see Figures 2.37 and 2.38 in Chapter (2). Q and (kappa) are attenuation parameters used in modeling the attenuation of ground motions (see section 2.5.4.2??? in Chapter 2)
No records Found