分离高阶模态面波的τ-p变换方法  

Application of τ-p Transformation to High and Order Mode in Surface Wave Separetion

作　　者：单娜琳[1] 刘占兴[2] 

机构地区：[1]桂林理工大学广西矿冶与环境科学实验中心,广西桂林541004 [2]桂林理工大学广西隐伏金属矿产勘查重点实验室,广西桂林541004

出　　处：《桂林理工大学学报》2013年第3期413-419,共7页Journal of Guilin University of Technology

基　　金：国家自然科学基金项目(41274070);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：用瞬态面波方法提取基阶模态面波频散曲线进行资料解释时,高阶模态面波为干扰波。根据高阶面波和基阶面波的群速度差异,应用τ-p变换方法压制地震记录中的高阶模态面波。为研究τ-p变换压制高阶面波的效果,模拟了2种高阶面波能量较强的地层模型的波形记录,应用τ-p变换压制高阶面波,获得了基阶模态面波频散曲线。对地层中含有软弱层的实测数据进行τ-p变换法分离高阶面波,较好地压制了高阶面波的影响。对理论模型和实测数据的应用效果表明,τ-p变换方法压制高阶模态面波方法简单易行。The fundamental mode of Rayleigh surface wave can be used in surface wave explanation. High mode composition is the disturbance in the construction of frequency dispersion curve, which may be composed of fundamental mode. Based on the apparent velocity difference between high mode and fundamental mode waves, the separation of high mode Rayleigh surface wave by r-p transformation is studied. The method has been successful applied to two theoratical geology constructions with massive energy of high mode wave, and i- deal fundamental mode frequency dispersion curve. The r-p transformation method has also been applied to the field data from the construction with soft intercalary. The method is effective with good appli cation.

关 键 词：瑞利面波勘探 基阶模态 高阶模态 Τ-P变换 

分 类 号：P631.429[天文地球—地质矿产勘探]