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Seismic waves in medium with poroelastic/elastic interfaces: a two-dimensional P-SV finite-difference modelling

Abstract : We present a new methodology of the finite-difference (FD) modelling of seismic wave propagation in a strongly heterogeneous medium composed of poroelastic (P) and (strictly) elastic (E) parts. The medium can include P/P, P/E and E/E material interfaces of arbitrary shapes. The poroelastic part can be with (i) zero resistive friction, (ii) non-zero constant resistive friction or (iii) JKD model of the frequency-dependent permeability and resistive friction. Our FD scheme is capable of subcell resolution: a material interface can have an arbitrary position in the spatial grid. The scheme keeps computational efficiency of the scheme for a smoothly and weakly heterogeneous medium (medium without material interfaces). Numerical tests against independent analytical, semi-analytical and spectral-element methods prove the efficiency and accuracy of our FD modelling. In numerical examples, we indicate effect of the P/E interfaces for the poroelastic medium with a constant resistive friction and medium with the JKD model of the frequency-dependent permeability and resistive friction. We address the 2-D P-SV problem. The approach can be readily extended to the 3-D problem.
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https://hal.inrae.fr/hal-03471065
Contributor : Gaëlle Lefeuve-Mesgouez Connect in order to contact the contributor
Submitted on : Wednesday, December 8, 2021 - 4:25:17 PM
Last modification on : Friday, February 4, 2022 - 3:07:42 AM

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David Gregor, Peter Moczo, Jozef Kristek, Arnaud Mesgouez, Gaëlle Lefeuve-Mesgouez, et al.. Seismic waves in medium with poroelastic/elastic interfaces: a two-dimensional P-SV finite-difference modelling. Geophysical Journal International, Oxford University Press (OUP), 2022, 228 (1), pp.551-588. ⟨10.1093/gji/ggab357⟩. ⟨hal-03471065⟩

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