An improved equivalent homogenous half-space method and reverse fitting analysis of Rayleigh wave dispersion curve

作者：Chen XA^*; Sun JZ

来源：Chinese Journal of Geophysics, 2006, 49(2): 569-576.

• Rayleigh wave
• multiple rank property
• dispersion curve
• improved equivalent homogenous half-space method
• inverse fitting analysis

Theoretical analysis shows that there are several values of the phase velocity to a certain frequency of the Rayleigh wave on the surface of a layered medium, which is called the multiple rank property of Rayleigh wave. The multiple rank property of the surface wave results in the complication of measured dispersion curves, especially when a soft interlayer exists in the strata. This brings difficulties to the explanation of the dispersion curves measured on this kind of sites. In order to facilitate engineering applications, a new method, improved equivalent homogenous half-space method, is proposed to compute the theoretical dispersion curve of a layered medium based on the equivalent homogenous half-space theory. This new method does not need to deal with the multiple value problem of the phase velocity, and the phase velocity resulting from this method can reflect the synthetic effect of all ranks of Rayleigh waves. The inverse fitting program is compiled based on the improved equivalent homogenous half-space method, which has gotten a very good effect in an engineering application.

• 出版日期2006-3
• 单位中国地质大学（北京）