Viscoelastic wave finite-difference modeling in the presence of topography with adaptive free-surface boundary condition
文献类型：期刊论文
| 作者 | Dong, Shu-Li1,2,3; Chen, Jing-Bo1,2,3; Li, Zheng1,2,3 |
| 刊名 | ACTA GEOPHYSICA
 |
| 出版日期 | 2021-09-07 |
| 页码 | 13 |
| 关键词 | Finite difference Free surface Viscoelastic wave modeling Irregular topography |
| ISSN号 | 1895-6572 |
| DOI | 10.1007/s11600-021-00666-7 |
| 英文摘要 | An accurate free-surface boundary condition is significant for seismic forward modeling and inversion. The finite-difference method (FDM) is widely used for its simplicity and efficiency. However, unlike the finite-element method (FEM) satisfying naturally the stress-free condition at the free surface, FDM needs additional treatment, particularly in the presence of irregular topography. In the elastic wave finite-difference modeling, the adaptive parameter-modified free-surface boundary condition has the advantages of high accuracy and simple operation. The viscoelastic wave equation can describe the nature of seismic waves more realistically. Based on the staggered-grid FDM, we extend the adaptive free-surface boundary condition to the viscoelastic medium with topography. This approach involves a combination of the average medium theory, vacuum approximation and limit idea. It is realized by modifying the viscoelastic constitutive relation. This method is simple enough, because three types of grid elements and in fact only two kinds of expressions are enough in the presence of topography. We only need to deal with the Lame parameters and the density at the free surface without reconstructing the existing algorithm. Viscoelastic analysis of different quality factor settings shows the viscous effect. Numerical examples display that the results of the presented method agree well with the reference solutions of spectral-element method both in crest- and trough-like model and in simplified Foothill model with irregular topography. The simulation of original Foothill model demonstrates the feasibility of our method. |
| WOS关键词 | GRAZING-INCIDENCE ; SPECTRAL-ELEMENT ; PROPAGATION ; MEDIA |
| 资助项目 | National Natural Science Foundation of China[42074159] ; National Natural Science Foundation of China[41874163] |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000693478000001 |
| 出版者 | SPRINGER INTERNATIONAL PUBLISHING AG |
| 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 |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/102640]  |
| 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 | Chen, Jing-Bo |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China 3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Shu-Li,Chen, Jing-Bo,Li, Zheng. Viscoelastic wave finite-difference modeling in the presence of topography with adaptive free-surface boundary condition[J]. ACTA GEOPHYSICA,2021:13. |
| APA | Dong, Shu-Li,Chen, Jing-Bo,&Li, Zheng.(2021).Viscoelastic wave finite-difference modeling in the presence of topography with adaptive free-surface boundary condition.ACTA GEOPHYSICA,13. |
| MLA | Dong, Shu-Li,et al."Viscoelastic wave finite-difference modeling in the presence of topography with adaptive free-surface boundary condition".ACTA GEOPHYSICA (2021):13. |
入库方式： OAI收割
来源：地质与地球物理研究所
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