若相速不仅依赖于介质的物理性质，还依赖于波数，这种波称为频散波。
结果表明，这两种声源激发的频散波具有很强的可对比性，它们的最低模式在单极声源激发时是斯通利波，在偶极声源激发时是弯曲波；
The results show that the dispersive wave excited by these two acoustic sources have strong contrast, which are Stoneley wave for monopole and flexural wave for dipole in the lowest mode.
频敌和衰减是面波传播中的两个基本特征，利用面波频散和衰减可以有效地研究地球内部速度结构和粘弹性结构。
Two of the most predominant characteristics of Surface Wave are Dispersion and Attenuation which are the effective tools to study the velocity structure and viscidity structure of the earth interior.
只有从频散的斯通利波和弯曲波中提取出相慢度，才有可能进一步求准地层渗透率和横波慢度等参数。
Only when phase slowness is extracted from the Stoneley wave and the flexural wave, can the parameters of formation be obtained exactly, such as permeability and shear slowness.
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