浅层地震多阶模态瑞利面波的位移幅度特征

Vertical Displacement of Multi-Modes Rayleigh Wave in Shallow Layer

研究了地层速度随深度递增型、地层中有硬层或软夹层型、表层为高速的公路型等4种地层结构在15 m深度内,瑞利面波各阶模态的位移幅度分布特征、多阶模态面波的理论频散曲线特征以及不同地层结构上的"最大模"面波频散曲线的特征.这些特征的研究有助于提高面波资料解释的准确性,在高阶模态面波占优势时,判断地层结构的类型,设计合适的反演初始模型,并有助于利用多阶模态瑞利面波解决复杂的地质问题.

The study covers the vertical displacement distribution character of each mode of Rayleigh wave, theoretical dispersion curve character of muhi-modes Rayleigh wave and the characters of the max-mode Rayleigh wave dispersion curve in different layers structure, which are velocity increasing with deep, high velocity layer within underground, low velocity layers within undergroan and high velocity surface layer, within the depth of 15 meters. The accuracy explanation of Rayleigh wave datum is improved, to determine the style of layer structure, to design the suitable inversion initial model when high-mode Rayleigh wave is dominant and to settle the difficult geology problems with the multi-modes Rayleigh wave.