2-D P-SV and SH spectral element modelling of seismic wave propagation in non-linear media with pore-pressure effects

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: 10.1093/gji/ggz041. This is version 1 of this Preprint.

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Authors

Elif Oral , Celine Gelis, Luis Fabian Bonilla 

Abstract

It has long been recognized that the effects of superficial geological layers, or site effects, can play a major role on the seismic ground motion at the free surface. In this study, we compute wave propagation in a 2-D asymmetrical basin considering both soil non-linearity and pore- pressure effects. Equations of elastodynamics of wave propagation are solved using the spectral element method (SEM). The geometry of the basin gives rise to basin-edge generated waves, that are different for in-plane (P-SV) and out-of-plane (SH) wave propagation and resulting in different non-linear response. Moreover, the excess-pore pressure development in superficial liquefiable layers (effective stress analysis) brings larger deformation and loss of strength than the analysis without pore-pressure effects (total stress analysis). The coupling of vertically propagating waves and the waves specifically generated in 1-D model leads to waves whose amplitude and duration are higher than the 1-D case. This multidimensional effect increases material non-linearity. Such complex wavefield provokes larger deformation and higher pore- pressure rise that cannot be predicted by 1-D modelling. Therefore, our paper suggests the use of multidimensional modelling while studying seismic wave propagation in both linear and non-linear complex media.

DOI

https://doi.org/10.31223/X5PC8F

Subjects

Earth Sciences, Engineering, Geophysics and Seismology, Geotechnical Engineering

Keywords

Elasticity and anelasticity, Site effects

Dates

Published: 2021-01-06 08:25

Last Updated: 2021-01-06 16:25

License

CC BY Attribution 4.0 International

Additional Metadata

Data Availability (Reason not available):
https://github.com/jpampuero/sem2dpack/tree/iwan

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