The guided waves in multilayered elastic media are studied. The mechanism of zigzag dispersion curves in the Rayleigh Wave Exploration is analyzed. It is proved that the zigzag dispersion curve can not be obtained by a single guided mode. The relation of the excitation intensity of each mode to the formation parameters is studied. We obtained many results about zigzag dispersion curves that were not available in previous literatures. The effects of the position and thickness of the low‐velocity layer and other parameters on the zigzag dispersion curves of Rayleigh wave are also analyzed. Finally, comparative analyses between the practical data and theoretical results are carried out. Theoretical results are consistent to the practical data.
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Zhang et al. (2002) studied this question.
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