이방성을 고려한 시간영역 유한차분법 탄성파 모델링에서의 경계조건

• Published in: 물리탐사, 11(2) pp. 153 - 160
• Main Authors: 민동주, 권병두, 임승철, 유해수, 이호용
• Format: Journal Article
• Language: Korean
• Published: 한국물리탐사학회 01.05.2008
• Subjects: 자원공학
• ISSN: 1229-1064

Seismic modeling is used to simulate wave propagation in the earth. Although the earth’s subsurface is usuallysemi-infinite, we cannot handle the semi-infinite model in seismic modeling because of limited computational resources.For this reason, we usually assume a finite-sized model in seismic modeling. In that case, we need to eliminate the edgereflections arising from the artificial boundaries introducing a proper boundary condition. In this study, we changed threekinds of boundary conditions (sponge boundary condition, Clayton and Engquist’s absorbing boundary condition, andHigdon’s transparent boundary condition) so that they can be applied in elastic wave modeling for anisotropic media.We then apply them to several models whose Poison’s ratios are different. Clayton and Engquist’s absorbing boundarycondition is unstable in both isotropic and anisotropic media, when Poison’s ratio is large. This indicates that theyields good results for both isotropic and anisotropic media, it requires too much computational memory and time. Onthe other hand, Higdon’s transparent boundary condition is not only inexpensive, but also reduce reflections over a widerange of incident angles. We think that Higdon’s transparent boundary condition can be a method of choice for anisotropicmedia, where Poisson’s ratio is large. KCI Citation Count: 2