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Diffraction and conversion of elastic waves at a corrugated interface

By
Anne Paul
Anne Paul
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Michel Campillo
Michel Campillo
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Published:
January 01, 2016

Abstract

Numerical modeling is used lo investigate the effect or small-scale irregularities of a reflecting boundary on elastic wave reflections. The scattered wave field is computed by using a discrctized form of boundary integral equations and a plane-wave decomposition of seismic wave fields. For various values of incidence angle of the P wave, we compute (he distribution of diffracted energy for both P waves and S waves as a function of reflection angle. We show that corrugations with mean wavelength of the order of. or smaller than, the seismic wavelength have little effect on the relieved P wave. However, the pattern of P-tct-5 conversion is very different from thai with a plane boundary. Scattered 5 waves appear at post critical iingles for any angle of incidence of the P wave. The amplitude of these n on geometrical shear waves decreases rapidly with decreasing amplitude of the corrugations, or when the mean wavelength of the corrugations becomes larger than the dominant seismic wavelength. The local geometry of the irregularities has u negligible cITccl on the scattered S waves. By analogy with perturbation theory, we propose interpreting the pos(critically scattered S waves as the contribution to the shear wave field of converted inhomogeneous P waves diffracted along the boundary.

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Contents

Society of Exploration Geophysicists Geophysics Reprint Series

Seismic Diffraction

Kamil Klem-Musatov
Kamil Klem-Musatov
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Henning Hoeber
Henning Hoeber
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Michael Pelissier
Michael Pelissier
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Tijmen Jan Moser
Tijmen Jan Moser
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Society of Exploration Geophysicists
Volume
30
ISBN electronic:
9781560803188
Publication date:
January 01, 2016

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