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Spatial spectral amplification of basin-transduced Rayleigh waves

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  • J. Narayan
  • Raj Kumar

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

Suggested Citation

  • J. Narayan & Raj Kumar, 2014. "Spatial spectral amplification of basin-transduced Rayleigh waves," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 71(1), pages 751-765, March.
    • Handle: RePEc:spr:nathaz:v:71:y:2014:i:1:p:751-765
    DOI: 10.1007/s11069-013-0917-2
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