Spatial spectral amplification of basin-transduced Rayleigh waves

This paper presents the effects of impedance contrast (IC) on the basin-edge, sediment thickness and rheology of sediment in the basin on the spatial spectral amplification and complex mode transformation of the basin-transduced Rayleigh (BTR) waves. BTR-wave, the acronym for the BTR wave is used in the manuscript. Seismic responses of a 2D basin-edge model were simulated using a P-SV wave fourth-order spatial accurate time-domain finite-difference algorithm based on staggered-grid approximation of viscoelastic velocity-stress wave equations. The used algorithm is efficient enough to incorporate the frequency-dependent damping in the time-domain simulation. Analysis of the computed seismic responses revealed that the spatial spectral amplification of the horizontal and vertical components of the BTR-wave in the basin was very much dependent on the distance of the site from the basin-edge, impedance contrast at the basin-edge, sediment damping and the thickness of sediment in the basin. Furthermore, the development of different modes of the BTR-wave very much depends on the sediment thickness and IC at the basin-edge. Copyright Springer Science+Business Media Dordrecht 2014