浅地表面波频散曲线组合勘探方法

面波勘探方法因其分辨率高、能量强,而且成本低、操作便捷等优势,被广泛应用于浅地表S波速度结构探测。为了兼顾面波探测深度及浅层分辨率,通过不同道间距组合,不同主频检波器组合,主、被动源组合,获得宽频带的面波频散曲线,实现在提高探测深度的同时保持浅层分辨率。实测结果表明,面波频散曲线组合勘探有效拓宽了频散曲线的频带宽度,兼顾了横波波速度结构反演深度和浅部速度结构的分辨率。

Exploration methods for subsurface by combined dispersion curves

Surface wave exploration method is widely used in S-wave velocity structure detection of shallow surface because of its advantages of high resolution, high energy, low cost and convenient operation. In order to take into account the detection depth and shallow resolution of surface wave, this paper achieves a wide-band surface wave dispersion curve by combining different channel spacing, different main frequency geophone and active and passive sources, so as to improve the detection depth while maintaining the shallow resolution. The measured data results show that the combined exploration of surface wave dispersion curve effectively broadens the frequency bandwidth of the dispersion curve, taking into account the inversion depth of shear wave velocity structure and the resolution of shallow velocity structure.