Source energy distribution and successive forwarding in layered and functionally graded elastic substructures

The paper is focused on the source energy distribution in vertically inhomogeneous elastic half-spaces with soft internal channels. The analysis is performed using the Fourier transform technique and Green's matrix integral representations. Time-averaged wave energy fluxes are calculated based on the Umov-Poynting energy vector concept. The excited guided waves exhibit a peculiar effect of wave energy localization in certain, specific for each wave mode, frequency ranges. Outwardly, it looks like a successive energy forwarding from every current mode to the next one.