Spatial spectral amplification of basin-transduced Rayleigh waves

J. Narayan () and Raj Kumar ()

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2014, vol. 71, issue 1, 765 pages

Abstract: 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

Keywords: Basin-edge effects; Complex mode transformation of basin-transduced surface wave; Spectral amplification of surface waves; Viscoelastic damping and finite-difference simulations (search for similar items in EconPapers)
Date: 2014
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DOI: 10.1007/s11069-013-0917-2

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