Two-dimensional time-domain finite-difference modeling for viscoelastic   seismic wave propagation

doi:10.1093/gji/ggw228

CORC > 北京大学 > 地球与空间科学学院

	Two-dimensional time-domain finite-difference modeling for viscoelastic seismic wave propagation
	Fan, Na ; Zhao, Lian-Feng ; Xie, Xiao-Bi ; Ge, Zengxi ; Yao, Zhen-Xing
刊名	GEOPHYSICAL JOURNAL INTERNATIONAL
	2016
关键词	Numerical solutions Elasticity and anelasticity Seismic attenuation Wave propagation INCLUDING SURFACE-TOPOGRAPHY CONSTANT-Q SYNTHETIC SEISMOGRAMS NUMERICAL-SIMULATION FRACTIONAL LAPLACIAN RHEOLOGICAL MODELS ATTENUATION MEDIA EFFICIENT DISPERSION
DOI	10.1093/gji/ggw228
英文摘要	Real Earth media are not perfectly elastic. Instead, they attenuate propagating mechanical waves. This anelastic phenomenon in wave propagation can be modeled by a viscoelastic mechanical model consisting of several standard linear solids. Using this viscoelastic model, we approximate a constant Q over a frequency band of interest. We use a four-element viscoelastic model with a trade-off between accuracy and computational costs to incorporate Q into 2-D time-domain first-order velocity-stress wave equations. To improve the computational efficiency, we limit the Q in the model to a list of discrete values between 2 and 1000. The related stress and strain relaxation times that characterize the viscoelastic model are pre-calculated and stored in a database for use by the finite-difference calculation. A viscoelastic finite-difference scheme that is second order in time and fourth order in space is developed based on the MacCormack algorithm. The new method is validated by comparing the numerical result with analytical solutions that are calculated using the generalized reflection/transmission coefficient method. The synthetic seismograms exhibit greater than 95 per cent consistency in a two-layer viscoelastic model. The dispersion generated from the simulation is consistent with the Kolsky-Futterman dispersion relationship.; National Natural Science Foundation of China [41174048, 41374065, 41374045]; SCI(E); EI; ARTICLE; zhaolf@mail.igcas.ac.cn; 3; 1539-1551; 206
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/494906]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Fan, Na,Zhao, Lian-Feng,Xie, Xiao-Bi,et al. Two-dimensional time-domain finite-difference modeling for viscoelastic seismic wave propagation[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2016.
APA	Fan, Na,Zhao, Lian-Feng,Xie, Xiao-Bi,Ge, Zengxi,&Yao, Zhen-Xing.(2016).Two-dimensional time-domain finite-difference modeling for viscoelastic seismic wave propagation.GEOPHYSICAL JOURNAL INTERNATIONAL.
MLA	Fan, Na,et al."Two-dimensional time-domain finite-difference modeling for viscoelastic seismic wave propagation".GEOPHYSICAL JOURNAL INTERNATIONAL (2016).