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Volume 22 Issue 2
Apr 2011
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Journal of Earth Science  > 2011  >  22(2): 226-230.
Shuangxi Zhang. Effective Dispersion Curve and Pseudo Multimode Dispersion Curves for Rayleigh Wave. Journal of Earth Science, 2011, 22(2): 226-230. doi: 10.1007/s12583-011-0175-8
Citation: Shuangxi Zhang. Effective Dispersion Curve and Pseudo Multimode Dispersion Curves for Rayleigh Wave. Journal of Earth Science, 2011, 22(2): 226-230. doi: 10.1007/s12583-011-0175-8
shu

Effective Dispersion Curve and Pseudo Multimode Dispersion Curves for Rayleigh Wave

doi: 10.1007/s12583-011-0175-8
  • 1.

    School of Geodesy and Geomatics, Wuhan University, Wuhan, 430079, China

  • 2.

    The Key Laboratory of Geospace Environment and Geodesy, Ministry of Education, Wuhan, 430079, China

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  • Corresponding author: Shuangxi ZHANG, shxzhang@sgg.whu.edu.cn
  • Received Date: 29 Sep 2010
  • Accepted Date: 25 Nov 2010
  • Publish Date: 01 Apr 2011
    Abstract
  • The hi-energy bands in the dispersion image are usually interpreted as the true dispersion phase velocities. However, the multiple dispersion modes of Rayleigh wave in layered media stack in space, producing the effective dispersion curve and the pseudo multimode dispersion curves in dispersion image. The effective dispersion curve has the maximum energy with lower phase velocities than pseudo dispersion phase velocities, and thus is often misunderstood as the fundamental mode. Within the tolerable misfit, the effective dispersion curve can approach the true fundamental mode. Different from the true multimode dispersion curves, the pseudo multimode dispersion curves are related to the effective dispersion curve. A numerical model is adapted to simulate the true dispersion curves, effective dispersion curve, and pseudo multimode dispersion curves. Their differences and mutual relations are demonstrated.

     

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