Considerations for anisotropic surface-wave inversion

Edan Gofer*, Ran Bachrach, Shmuel Marco

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

Abstract

Near-surface characterization of elastic wave velocities is important for both the engineering and environmental geophysics community and for the geophysical exploration community. Surface-wave inversion is a common method used to estimate shear velocity at the shallow subsurface. Most common Rayleigh-wave inversions are carried out assuming a stratified media of homogenous isotropic layers and use propagator-matrix methods as the forward model operator. Still, in the shallow subsurface, vertical compaction can induce vertical transverse isotropy (VTI) in loose sediments. Rayleigh-wave phase velocity depends on four of the five VTI independent elastic parameters. Herein, we show the effect anisotropy has on the Rayleigh-wave dispersion curve. We also present model parameter uncertainty analysis of two proposed parameterizations for anisotropic VTI inversion. One parameterization is based on Thomsen's parameters and a second parameterization is based on the density normalized elastic tensor.

Original languageEnglish
Pages (from-to)2627-2631
Number of pages5
JournalSEG Technical Program Expanded Abstracts
DOIs
StatePublished - 17 Aug 2017
EventSociety of Exploration Geophysicists International Exposition and 87th Annual Meeting, SEG 2017 - Houston, United States
Duration: 24 Sep 201729 Sep 2017

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