Free surface boundary condition in finite-difference elastic wave modeling

Title
Free surface boundary condition in finite-difference elastic wave modeling
Author(s)
민동주; 신창수; 유해수; 홍종국; 박민규
Alternative Author(s)
민동주; 유해수; 홍종국; 박민규
Publication Year
2002-05-30
Abstract
Free-surface boundary condition is one of the most important factors governing the accuracy of elastic wave modeling technique that can efficiently be used in seismic inversion and migration. We devised a method that exactly describes free surface boundary in finite-difference elastic wave modeling. Our method is to assign material properties such as density and Lamé constants to the areas rather than the nodal points. By using the area-based grid set, we do not have to additionally introduce any constraint of expressing stress-free conditions. Just by defining material properties above the free surface as zero, we could accurately depict free-surface boundary using the finite-difference method. Our method leads to symmetric impedance matrix, thus not breaking reciprocity, which enhances computational efficiency in seismic inversion and migration computing Jacobian (sensitivity) matrix
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/32576
Bibliographic Citation
EAGE 64th Conference & Exhibition, pp.264, 2002
Publisher
European Association of Geoscientists & Engineers
Type
Conference
Language
English
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