Wavepath tomography using a monochromatic frequency-domain wave equation

	Wavepath tomography using a monochromatic frequency-domain wave equation
	Qin, YL ; Pyun, S ; Shin, C
刊名	JOURNAL OF SEISMIC EXPLORATION
	2006-05-01
卷号	15 期号:1 页码:59-79
关键词	wavepath tomography frequency-domain modelling first-arrival traveltime logarithm wavefield steep descent
ISSN号	0963-0651
文献子类	Article
英文摘要	Traveltime tomography requires an algorithm for efficient and accurate computation of traveltimes and their paths, i.e., traveltime derivatives with respect to the subsurface parameters. Conventional ray-theoretical traveltime inversion algorithms calculate the traveltime and the corresponding raypaths using raytracing methods, which are all based on the assumption of infinite frequency, but the field seismic waves are band-limited. Unlike conventional raytracing theory, wave-equation tomography can account for the band-limited characteristics of seismic waves. Therefore, in this paper we compute traveltimes and their wavepaths by solving the suppressed monochromatic frequency-domain wave equation. The first-arrival traveltime is obtained by taking the natural logarithm of a strongly suppressed monochromatic wave field, and the wavepath is obtained by taking the imaginary part of the partial derivative wavefield, where the wavefield partial derivative is efficiently calculated by the virtual source principle and the reciprocity principle. The results show that the traveltime calculated by the wave equation is much smoother than the ray-theoretical traveltime, and the wavepath has different sensitivity and width for different velocity structures. Similar to the resolution analysis of ray density, the superposition of all the wavepaths can also give the resolution image.
WOS关键词	TRAVEL-TIME ; FORM INVERSION
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	GEOPHYSICAL PRESS
WOS记录号	WOS:000238682300005
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67128]
专题	中国科学院地质与地球物理研究所
通讯作者	Qin, YL
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Seoul Natl Univ, Sch Civil Urban & Geosyst Engn, Seoul 151742, South Korea
推荐引用方式 GB/T 7714	Qin, YL,Pyun, S,Shin, C. Wavepath tomography using a monochromatic frequency-domain wave equation[J]. JOURNAL OF SEISMIC EXPLORATION,2006,15(1):59-79.
APA	Qin, YL,Pyun, S,&Shin, C.(2006).Wavepath tomography using a monochromatic frequency-domain wave equation.JOURNAL OF SEISMIC EXPLORATION,15(1),59-79.
MLA	Qin, YL,et al."Wavepath tomography using a monochromatic frequency-domain wave equation".JOURNAL OF SEISMIC EXPLORATION 15.1(2006):59-79.