A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling

doi:10.1190/GEO2018-0098.1

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院油气资源研究重点实验室

	A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling
	Cao, Jian 1,2,3; Chen, Jing-Bo 2,3
刊名	GEOPHYSICS
	2018-11-01
卷号	83 期号:6 页码:T313-T332
ISSN号	0016-8033
DOI	10.1190/GEO2018-0098.1
英文摘要	Accurate seismic modeling with a realistic topography plays an essential role in onshore seismic migration and inversion. The finite-difference (FD) method is one of the most popular numerical tools for seismic modeling. But implementing the free surface on topography using the FD method is nontrivial. We have developed a stable and efficient parameter-modified (PM) method for modeling elastic-wave propagation in the presence of complex topography. This method is based on a standard staggered-grid scheme, and the stress-free condition is implemented on the rugged surface by modifying the redefined medium parameters at the discrete topography boundary points. This numerical treatment for topography needs to be performed only once before the wave simulation. In this way, we avoid the tedious handling of wavefield variables in every time step, and this boundary treatment can be integrated easily into existing staggered-grid FD modeling codes. A series of numerical tests in two dimensions and three dimensions indicate that with a spatial sampling of 15 grid points per minimum wavelength, our method is good enough to eliminate staircase diffractions and produces more accurate results than those obtained by some other staggered-grid-based numerical approaches. Numerical experiments on some more complex models also demonstrate the feasibility of our method in handling topography with strong variation and Poisson's ratio discontinuity. In addition, this PM method can be used in a discontinuous-grid scheme in which only the regions near the irregular topography need to be oversampled, which is very important for improving its efficiency in real applications.
资助项目	National Natural Science Foundation of China[41674132] ; National Natural Science Foundation of China[41474104]
WOS关键词	SPECTRAL ELEMENT METHOD ; BOUNDARY-CONDITIONS ; HETEROGENEOUS MEDIA ; RAYLEIGH-WAVES ; SEISMIC MOTION ; PROPAGATION ; SIMULATION ; SCHEMES
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SOC EXPLORATION GEOPHYSICISTS
WOS记录号	WOS:000457502000059
资助机构	National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/90546]
专题	地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者	Cao, Jian
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Cao, Jian,Chen, Jing-Bo. A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling[J]. GEOPHYSICS,2018,83(6):T313-T332.
APA	Cao, Jian,&Chen, Jing-Bo.(2018).A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling.GEOPHYSICS,83(6),T313-T332.
MLA	Cao, Jian,et al."A parameter-modified method for implementing surface topography in elastic-wave finite-difference modeling".GEOPHYSICS 83.6(2018):T313-T332.