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Title of Journal: Pure Appl Geophys

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Abbravation: Pure and Applied Geophysics

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SP Birkhäuser Verlag Basel

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DOI

10.1002/aic.690170642

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1420-9136

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FiniteDifference Modeling and Dispersion Analysis

Authors: Yinhe Luo Jianghai Xia Yixian Xu Chong Zeng Jiangping Liu
Publish Date: 2010/04/23
Volume: 167, Issue: 12, Pages: 1525-1536
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Abstract

Lovewave propagation has been a topic of interest to crustal earthquake and engineering seismologists for many years because it is independent of Poisson’s ratio and more sensitive to shear Swave velocity changes and layer thickness changes than are Rayleigh waves It is well known that Lovewave generation requires the existence of a low Swave velocity layer in a multilayered earth model In order to study numerically the propagation of Love waves in a layered earth model and dispersion characteristics for nearsurface applications we simulate highfrequency 5 Hz Love waves by the staggeredgrid finitedifference FD method The air–earth boundary the shear stress above the free surface is treated using the stressimaging technique We use a twolayer model to demonstrate the accuracy of the staggeredgrid modeling scheme We also simulate fourlayer models including a lowvelocity layer LVL or a highvelocity layer HVL to analyze dispersive energy characteristics for nearsurface applications Results demonstrate that 1 the staggeredgrid FD code and stressimaging technique are suitable for treating the freesurface boundary conditions for Lovewave modeling 2 Lovewave inversion should be treated with extra care when a LVL exists because of a lack of LVL information in dispersions aggravating uncertainties in the inversion procedure and 3 energy of high modes in a lowfrequency range is very weak so that it is difficult to estimate the cutoff frequency accurately and “modecrossing” occurs between the second higher and third higher modes when a HVL existsThis work is supported by the National Science Foundation of China NSFC 40904031 and the Special Fund for Basic Scientific Research of Central Colleges China University of Geosciences Wuhan 090106 The first author appreciates the Kansas Geological Survey University of Kansas for providing opportunities in surfacewave research and the China University of Geosciences for the financial support to conduct this study The authors thank Marla AdkinsHeljeson of the Kansas Geological Survey for editing the manuscript

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