数字滤波法分离高、基阶模态瑞利面波的应用  

Application of Digital Filtering Method in Separating Fundamental Mode and High Mode Rayleigh Surface Wave

作　　者：单娜琳[1] 黄基文[2] 

机构地区：[1]桂林理工大学广西地质工程中心重点实验室,广西桂林541004 [2]桂林理工大学地球科学学院,广西桂林541004

出　　处：《桂林理工大学学报》2010年第4期513-517,共5页Journal of Guilin University of Technology

基　　金：广西自然科学基金项目(桂科自0447094);广西地质工程中心重点实验室项目(桂科能07109011-K001);广西高校"地质工程与地质资源"人才小高地建设项目(桂教人[2005]80)

摘　　要：面波勘探主要利用基阶模态面波频散曲线进行定性或定量解释,而记录中的高阶模态面波对提取基阶模态面波频散曲线是一种规则干扰,本文采用二维数字滤波法去除高视速度的高阶模态面波。模拟了软夹层型和硬夹层型两种地层结构的含多阶模态面波理论记录和频散数据。利用带通切饼式二维数字滤波器对存在视速度差异的高阶模态面波和基阶模态面波进行滤波分离试验,研究证明二维数字滤波方法简单可行,可以在一定程度上压制高阶模态面波的影响。特别对于高阶模态面波影响严重的面波记录有突出基阶模态面波的较好效果。The fundamental mode can be suitably used in the explanation of Rayleigh surface wave data.So the high mode composition of Rayleigh surface wave is the disturbance in the construction of frequency dispersion curve which is considered to be composed of fundamental mode.This paper deals with the separation of high mode Rayleigh surface wave which has relatively high apparent velocity and fundamental mode one by 2D digital filtering.The Rayleigh surface wave data composed of multiple mode position is simulated for soft-intercalary and stiff-intercalary strata earth model.The apparent velocity differences between different mode Rayleigh wave are utilized to separate fundamental mode and high mode.The study shows that 2D digital filtering is effective to suppress the influence of high mode wave and improve the explanation of Rayleigh surface wave data.

关 键 词：瞬态瑞利面波勘探 基阶模态面波 高阶模态面波 二维数字滤波 

分 类 号：P631.429[天文地球—地质矿产勘探]