Homogenization of sedimentary basins for the simulation of lithological site effects

Marius Rapenne and Paul Cupillard and Corentin Gouache. ( 2024 )
in: Proc. 2024 RING Meeting, pages 14, ASGA

Abstract

With the constant increase of computational power, the numerical modelling of lithological site effects can now handle 3D, geologically complex settings. However, a computational overburden is reached when, e.g., uncertainties have to be quantified. A possible pathway towards decreasing the cost of seismic wave simulations in complex media is the non-periodic homogenization. This method is known to provide accurate effective media for wave propagation. In this work, we apply it to 2D sedimentary basins and explore its efficiency and accuracy in terms of amplification simulation. Two homogenization strategies are investigated: the Backus’ one, which considers the geological medium as a juxtaposition of 1D profiles, and the more general 2D homogenization, which involves the resolution of a partial differential equation. Using various velocity contrasts and geometries, we emphasize cases which require the general homogenization for an accurate modelling of amplification effects.

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BibTeX Reference

@inproceedings{rapenne_homogenization_RM2024,
 abstract = {With the constant increase of computational power, the numerical modelling of lithological site effects can now handle 3D, geologically complex settings. However, a computational overburden is reached when, e.g., uncertainties have to be quantified. A possible pathway towards decreasing the cost of seismic wave simulations in complex media is the non-periodic homogenization. This method is known to provide accurate effective media for wave propagation. In this work, we apply it to 2D sedimentary basins and explore its efficiency and accuracy in terms of amplification simulation. Two homogenization strategies are investigated: the Backus’ one, which considers the geological medium as a juxtaposition of 1D profiles, and the more general 2D homogenization, which involves the resolution of a partial differential equation. Using various velocity contrasts and geometries, we emphasize cases which require the general homogenization for an accurate modelling of amplification effects.},
 author = {Rapenne, Marius and Cupillard, Paul and Gouache, Corentin},
 booktitle = {Proc. 2024 RING Meeting},
 language = {en},
 pages = {14},
 publisher = {ASGA},
 title = {Homogenization of sedimentary basins for the simulation of lithological site effects},
 year = {2024}
}