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高频面波方法是以瑞雷波和勒夫波为研究对象,在水文、工程和环境研究中具有广泛的应用,其主要思想是利用面波的频散特性来反映浅层地质问题,提取高质量的频散曲线成了面波勘探中的一个重要步骤.本文通过对理论模型研究说明,利用τ-p变换与F-K变换两种方法均能有效地进行频散能量成像,其效果在高频范围差别不大,在低频范围F-K变换提取频散曲线更为精确;与瑞雷波记录相比,勒夫波记录信噪比较高,通过对同一地区采集的瑞雷波和勒夫波进行频散分析可知,瑞雷波记录频散能量成像效果差,频散能量出现间断、跳跃的现象,而勒夫波记录频散能量连续、集中,相速度分辨率较高,提取频散曲线简单清晰,可为反演地表横波精细速度结构提供更好的频散曲线数据.
The high frequency surface wave method is based on Rayleigh waves and Love waves, and has wide applications in hydrological, engineering and environmental studies. The main idea of this method is to use the dispersion characteristics of surface waves to reflect shallow geological problems and to extract The high-quality dispersion curve becomes an important step in surface wave exploration.Through the study on the theoretical model, we can use both the τ-p transform and the FK transform to effectively perform the dispersion energy imaging, Frequency range is not very different, the FK transform in the low frequency range to extract the dispersion curve more accurately; compared with the Rayleigh wave recording, the signal to noise ratio of the Love wave recording is high, through the same area collected Rayleigh wave and Love wave Dispersion analysis shows that Rayleigh waves have poor recording effect of scattered energy imaging and discontinuities and jumps of frequency dispersion energy, while Loew-wave records dispersive energy with continuous, concentrated and high phase velocity resolution, and takes dispersion curve Simple and clear, it can provide better dispersion curve data for the inversion of the fine velocity structure of the surface S-wave.