Laplace-domain wave-equation modeling and full waveform inversion in 3D isotropic elastic media SCIE SCOPUS

Cited 8 time in WEB OF SCIENCE Cited 9 time in Scopus
Title
Laplace-domain wave-equation modeling and full waveform inversion in 3D isotropic elastic media
Author(s)
Son, Woohyun; Pyun, Sukjoon; Shin, Changsoo; Kim, Han-Joon
Alternative Author(s)
손우현; 김한준
Publication Year
2014-06
Abstract
The 3D elastic problem has not been widely studied because of the computational burden. Over the past few years, 3D elastic full waveform inversion (FWI) techniques in the time and frequency domains have been proposed by some researchers based on developments in computer science. However, these techniques still have the non-uniqueness and high nonlinearity problems. In this paper, we propose a 3D elastic FWI algorithm in the Laplace domain that can mitigate these problems. To efficiently solve the impedance matrix, we adopt a first-order absorbing boundary condition that results in a symmetric system. A conjugate gradient (CG) solver can be used because the Laplace-domain wave equation is naturally positive definite. We apply the Jacobi preconditioner to increase the convergence speed. We identify the permissible range of Laplace damping constants through dispersion analysis and accuracy tests. We perform the Laplace-domain FWI based on a logarithmic objective function, and the inversion examples are designed for a land setting, which means that the source is vertically excited and multi-component data are considered. The inversion results indicate that the inversion that uses only the vertical component performs slightly better than the multi-component inversion. This unexpected result is obtained partly because we use a vertically polarized source. We analyze the residuals and Frechet derivatives for each component to examine the characteristics of the Laplace-domain multi-component FWI. The results indicate that the residuals and Frechet derivatives for the horizontal component have a singularity problem. The numerical examples demonstrate that the singularity problem is related to the directivity of the displacement and to taking the logarithm of Laplace-domain wave fields. To avoid this singularity problem, we use a simple method that excludes the data near the singular region. Although we can use either simultaneous or sequential strategies to invert the Laplace-domain data, we apply a simultaneous inversion strategy in this paper. Nonetheless, the numerical examples demonstrate that our inversion algorithm yields reasonable long-wavelength velocity structures. (C) 2014 Elsevier B.V. All rights reserved.
ISSN
0926-9851
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/2803
DOI
10.1016/j.jappgeo.2014.03.013
Bibliographic Citation
JOURNAL OF APPLIED GEOPHYSICS, v.105, pp.120 - 132, 2014
Publisher
ELSEVIER
Subject
FINITE-DIFFERENCE; FREQUENCY-DOMAIN; TRAVEL-TIME; ACCURACY; SOLVER
Keywords
3D; Elastic media; Modeling; Full waveform inversion; Laplace domain
Type
Article
Language
English
Document Type
Article
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