Inhomogenous Plane Waves
Inhomogenous Plane Waves : Plane waves with amplitudes varying in a direction different from the direction of propagation. The propagation velocity is lower than that for regular plane waves. For example, Rayleigh waves are composed of inhomogeneous P and SV waves propagating horizontally with amplitudes decaying with depth. They are also called "evanescent waves". See: Aki and Richards (2002 or 2009, p. 149-157)
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