A global minimum traveltime raytracing algorithm of wavefront expanding with interface points as secondary sources

	A global minimum traveltime raytracing algorithm of wavefront expanding with interface points as secondary sources
	Zhang Mei-Gen; Jia Yu-Ge; Wang Miao-Yue; Li Xiao-Fan
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2006-07-01
卷号	49 期号:4 页码:1169-1175
关键词	shortest path ray tracing interface source method wavefront expanding method global minimum traveltime
ISSN号	0001-5733
文献子类	Article
英文摘要	The shortest path raytracing presented by Moser is a kind of fast and stable method to calculate global minimum traveltimes and raypaths. But it has two drawbacks. One is that most derived zig-zag raypaths are longer than true paths and thus mispositioned. The other is that there may be several equally short paths, especially in flat areas with low velocity variations. The wavefront expanding method with interface points as secondary. sources is studied in the paper which aims to solve the problems. Different from Moser's method, this approach only sets secondary sources on interfaces between different media. Rays from a secondary source can reach nodes as long as paths don't penetrate interfaces. Waves propagate along accurate paths in homogeneous layers or blocks. Obviously, there are much more ray directions from a secondary source with this method than with Moser's method. The main tracing errors only come from interface discretization. As a result, raytracing with the method can get much more accurate results than Moser's method. At the same time, the method is efficient as there are much less secondary sources than those in Moser's. Numerical examples show the method is efficient.
WOS关键词	SHORTEST-PATH ; SYMPLECTIC ALGORITHM ; RAY
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000239222700032
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67108]
专题	中国科学院地质与地球物理研究所
通讯作者	Zhang Mei-Gen
作者单位	Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Zhang Mei-Gen,Jia Yu-Ge,Wang Miao-Yue,et al. A global minimum traveltime raytracing algorithm of wavefront expanding with interface points as secondary sources[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2006,49(4):1169-1175.
APA	Zhang Mei-Gen,Jia Yu-Ge,Wang Miao-Yue,&Li Xiao-Fan.(2006).A global minimum traveltime raytracing algorithm of wavefront expanding with interface points as secondary sources.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,49(4),1169-1175.
MLA	Zhang Mei-Gen,et al."A global minimum traveltime raytracing algorithm of wavefront expanding with interface points as secondary sources".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 49.4(2006):1169-1175.