Nonlinear travel-time inversion for 3-D complex crustal velocity structure

doi:10.6038/cjg20170414

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 > 岩石圈演化国家重点实验室

	Nonlinear travel-time inversion for 3-D complex crustal velocity structure
	Yu Gui-Ping 1,2; Xu Tao 1,3; Zhang Ming-Hui 1,2; Bai Zhi-Ming 1; Liu You-Shan 1; Wu Cheng-Long1,2 ; Teng Ji-Wen 1
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2017-04-01
卷号	60 期号:4 页码:1398-1410
关键词	Crustal structure Travel-time inversion Block modeling Ray tracing Nonlinear conjugate gradient
ISSN号	0001-5733
DOI	10.6038/cjg20170414
文献子类	Article
英文摘要	Complex crustal structures generally characterize global orogenic belts and Midwest China. With the deepening of mineral resources exploration and increasing detection of the deep earth, it is becoming a great challenge to use new methods to probe fine crustal structure beneath orogenic belts and basin-mountain coupling regions. Basic characteristics of crustal structure of different tectonic domains are becoming clearer and clearer in deep seismic soundings. However, it is difficult for the traditional layered structure modeling method, in which layer boundaries are smoothing and fine velocity discontinuities are often ignored, to describe complex geological models, making it difficult to meet the development requirements of fine structure imaging of crust. In view of the above difficulties, based on a newly developed block modeling scheme to describe three-dimensional complex crustal models and a corresponding segmentally iterative ray tracing (SIRT) method, we derive the travel-time partial derivatives of triangular interface depth and grid velocity, and develop a 3-D nonlinear conjugate gradient travel-time inversion method. Block modeling scheme is able to construct any complex geological models in theory and can be used to efficiently build initial models by combining various priori velocity and interface information. In the inversion process, PRP (Polak-Ribiere-Polyak) type of the conjugate gradient method is used to solve the constrained damping least squares problem. We develop the joint inversion of grid velocity and interface depth based on multi seismic phases like direct waves and reflected waves, and make a great improvement of the inversion resolution compared with the traditional method which is based on single phase. To improve the convergence accuracy of inversion results, strategies like different weighting factors for different seismic phases and normalization of travel-time partial derivatives of different parameters are introduced in the joint inversion process. Numerical examples are given and a special layered cross-cutting model is used to simply simulate the application form of our method for fine structure imaging of crust, showing that nonlinear conjugate gradient travel-time inversion method based on block modeling is suitable for complex crustal models, which has good application prospects in the field of fine crustal structure imaging based on travel-time data of artificial seismic sources.
WOS关键词	SEISMIC-REFRACTION ; GEOLOGICAL MODELS ; STRUCTURE BENEATH ; MULTIPLE CLASSES ; TOMOGRAPHY ; INTERFACE ; CARPATHIANS ; CONSTRAINTS ; PROFILES ; ARRIVALS
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000399967500014
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/42521]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者	Xu Tao
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
推荐引用方式 GB/T 7714	Yu Gui-Ping,Xu Tao,Zhang Ming-Hui,et al. Nonlinear travel-time inversion for 3-D complex crustal velocity structure[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(4):1398-1410.
APA	Yu Gui-Ping.,Xu Tao.,Zhang Ming-Hui.,Bai Zhi-Ming.,Liu You-Shan.,...&Teng Ji-Wen.(2017).Nonlinear travel-time inversion for 3-D complex crustal velocity structure.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(4),1398-1410.
MLA	Yu Gui-Ping,et al."Nonlinear travel-time inversion for 3-D complex crustal velocity structure".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.4(2017):1398-1410.