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Elastic modeling in 3D tilted transversely isotropic (TTI) media with convolutional perfectly matched layer (CPML) boundary conditions

Authors
Han, B.Seol, S.J.Byun, Joongmoo
Issue Date
Jan-2011
Keywords
3D; Elastic; Finite difference; Modeling; TTI
Citation
SEG Technical Program Expanded Abstracts, v.30, no.1, pp.3037 - 3041
Indexed
SCOPUS
Journal Title
SEG Technical Program Expanded Abstracts
Volume
30
Number
1
Start Page
3037
End Page
3041
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/169226
DOI
10.1190/1.3627826
ISSN
1052-3812
Abstract
To simulate wave propagation in a tilted transversely isotropic (TTI) medium, we developed a three-dimensional (3D) elastic forward modeling algorithm with staggered-grid finite-difference method in time domain. To remove the artificial reflections efficiently at the model boundary, we derived the convolutional perfectly matched layer (CPML) absorbing boundary conditions for a TTI medium. In this paper, numerical experiments indicate that elastic wave propagation is well simulated and CPML boundary conditions efficiently remove artificial reflections in the 3D TTI medium. The S-wave split is clearly shown caused by the tilted orientation of the anisotropy which is determined by a dip and strike in 3D medium. In addition, through parallelization of the model space in z-direction with message passing interface (MPI), we can dramatically reduce the computation time and required memory.
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