瑞雷波“之”形速度—深度曲线的成因

Mechanism of zigzag dispersion curve of rayleigh waves

本文通过对层状介质的瑞雷方程进行求解，验证了层状介质中瑞雷波的多阶性，讨论了各阶导渡对频散曲线的影响．在此基础上，从两个方面对实测速度一深度曲线常出现的“之”字形进行了解释，提出了其中还有待进一步解决的问题及相应的建议．

From numerical solutions for the Rayleigh equation of multiple layer media,we find that there are severalvalues of the phase velocity which have same frequency.For example,there should be several different Rayleighwaves propagating with different velocities relative to a single frequency.This may be one of the reasons for the oc-currence of zigzag dispersion curves of Rayleigh waves.Furthermore,some problems are proposed this paper for fur-ther studying.