MSFM-based travel-times calculation in complex near-surface model

doi:10.6038/cjg20130922

	MSFM-based travel-times calculation in complex near-surface model
	Lu Hui-Yi; Liu Yi-Ke; Chang Xu
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2013-09-01
卷号	56 期号:9 页码:3100-3108
关键词	Travel-time tomography Ray tracing FMM MSFM
ISSN号	0001-5733
DOI	10.6038/cjg20130922
文献子类	Article
英文摘要	Seismic traveltime tomography method is an important technique which is used to reconstruct complex near-surface velocity models. This is an iterative inversion method, whose process requires repeated calculations of seismic ray traveltime. Therefore, one of key practical technologies of tomography is to research a traveltime calculation method which is with high efficiency and precision and can adapt to the complex model. MSFM (Multi-stencils Fast Marching Method) proposed in the field of medical imaging will be introduced to traveltime calculations of seismic tomography. The method reduces large errors existed in the diagonal direction of standard FMM by generating new calculation stencils, which is based on coordinate rotation and make the diagonally adjacent grid points involve in the calculation. The calculation efficiency and accuracy of these methods will be analyzed and compared. The implementation scheme of MSFM for irregularly topographic complex near-surface model is studied. The local grid-refinement near source along the topography is adopted, which will largely improve the calculation precision by little calculation cost. Numerical analysis and experiments demonstrate that MSFM improves the accuracy while retaining the high efficiency of standard FMM. Test of traveltimes calculation forward and tomographic inversion for irregular model verifies the powerful applicable potency of MSFM applied in complex model. The study concludes that MSFM has very valuable application as an accurate and efficient traveltime calculation method in seismic traveltime tomography.
WOS关键词	FAST MARCHING METHOD ; FINITE-DIFFERENCE CALCULATION ; EIKONAL EQUATION ; TOPOGRAPHICAL CONDITIONS ; COMPUTATION ; MEDIA ; VELOCITY ; ACCURATE ; FRONTS ; RAYS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000328723600022
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/87212]
专题	中国科学院地质与地球物理研究所
通讯作者	Lu Hui-Yi
作者单位	Chinese Acad Sci, Inst Geogl & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Lu Hui-Yi,Liu Yi-Ke,Chang Xu. MSFM-based travel-times calculation in complex near-surface model[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2013,56(9):3100-3108.
APA	Lu Hui-Yi,Liu Yi-Ke,&Chang Xu.(2013).MSFM-based travel-times calculation in complex near-surface model.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,56(9),3100-3108.
MLA	Lu Hui-Yi,et al."MSFM-based travel-times calculation in complex near-surface model".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 56.9(2013):3100-3108.