Comparison of different one-way propagators for wave forward propagation in heterogeneous crustal wave guides

doi:10.1785/0120050159

	Comparison of different one-way propagators for wave forward propagation in heterogeneous crustal wave guides
	Fu, LY
刊名	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
	2006-06-01
卷号	96 期号:3 页码:1091-1113
ISSN号	0037-1106
DOI	10.1785/0120050159
英文摘要	Crustal wave guides are usually heterogeneous on many scales, some of which can be investigated for regional phases by one-way approximation methods. The advantage of one-way propagation methods is the greater saving of computing time and memory, often up to several orders, than the full-waveform numerical methods. By slicing a half-space crustal wave guide into a number of slabs perpendicular to the propagation direction, Wu et al. (2000) formulate a wide-angle pseudoscreen method for the SH half-space problem, which leads to a generalized screen propagator (GSP) for simulating Lg propagation. In this article we introduce a broadband constant-coefficient propagator for the SH half-space problem, which accounts for wide angles in large-contrast media while allowing implementation using Fourier transforms alone. Particular attention is paid to the first-order separation-of-variables screen propagator (SVSP1) that significantly improves the split-step Fourier (SSF) method for large lateral variations at the cost of one more Fourier transform in each slab. Advancing wave fields by SVSP1 is actually a linear interpolation in the wavenumber domain between two split-step terms. We benchmark the SSF, GSP, and SVSP1 synthetic seismograms against the full-waveform boundary-element synthetics for flat, belling, and necking crustal wave guides, which shows that the SVSP1 method can model the Lg phase and the mantle wave (head wave) quite well in both travel time, energy, and waveform for most common mantle velocity perturbations. These numerical comparisons also demonstrate some limitations (especially in waveform) of the one-way propagation methods to model the Lg code attributed by forward scatterings as a result of lateral irregularities of the Moho.
语种	英语
出版者	SEISMOLOGICAL SOC AMER
WOS记录号	WOS:000238001100023
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/67072]
专题	中国科学院地质与地球物理研究所
通讯作者	Fu, LY
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	Fu, LY. Comparison of different one-way propagators for wave forward propagation in heterogeneous crustal wave guides[J]. BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,2006,96(3):1091-1113.
APA	Fu, LY.(2006).Comparison of different one-way propagators for wave forward propagation in heterogeneous crustal wave guides.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,96(3),1091-1113.
MLA	Fu, LY."Comparison of different one-way propagators for wave forward propagation in heterogeneous crustal wave guides".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 96.3(2006):1091-1113.