面波频散曲线提取方法对比分析  

Comparative analysis of extracting methods of surface wave dispersion curves

作　　者：金聪[1,2] 杨文海 罗登贵[1,2] 刘江平[4] 

机构地区：[1]中国地震局地震研究所,地震预警湖北省重点实验室,武汉430071 [2]武汉地震工程研究院有限公司,武汉430071 [3]武汉市勘察设计有限公司,武汉430022 [4]中国地质大学(武汉)地球物理与空间信息学院,武汉430074

出　　处：《地球物理学进展》2016年第6期2735-2742,共8页Progress in Geophysics

基　　金：编辑部的大力支持

摘　　要：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.High-frequency surface wave method is based on a study of Rayleigh Wave and Love wave,which has great practical value and wide applications in ground water,engineering,and environmental studies. The main idea is to reveal geology structure of low layer by making use of frequency dispersion characteristics of surface waves.The extraction of high-quality dispersion curve is an important step in the surface wave exploration. Both τ-p transform and F-K transform methods can effective dispersion energy Imaging based on the study of theoretical model,and they all have a little difference comparing with the theoretical value in the high frequency. But in the low frequency,F-K transform has a better result,which is closer to the theoretical value. The measured Love wave has a higher signal to noise ratio compare to the Rayleigh wave. By dispersion analysis of Rayleigh wave and Love wave collected in the same area,we can conclude that,Rayleigh wave has poor dispersion energy image,but dispersion energy of Love wave is more continuous and the dispersion curve is more simple and clear. That can provide a better data of dispersion curves for the inversion of surface wave to get s-wave velocity structure.

关 键 词：瑞雷波 勒夫波 频散曲线 Τ-P变换 F-K变换 

分 类 号：P631[天文地球—地质矿产勘探]