偏振分析在地震信号检测中的应用  

The application of polarization analysis in seismic signal detection

作　　者：林建民[1] 杨微[2] 陈蒙[2] 吴仁豪[1] 葛洪魁[2] 

机构地区：[1]浙江海洋学院 [2]中国地震局地球物理研究所,北京100081

出　　处：《中国地震》2012年第2期133-143,共11页Earthquake Research in China

基　　金：国家自然科学基金(41104027);浙江省教育厅科研项目(Y201019121);浙江海洋学院科研启动项目共同资助

摘　　要：给出了一种3分量地震数据偏振分析的技术,并将其应用到人工地震勘探信号的提取中。该技术基于时域算法,通过对协方差矩阵的本征分析,在滑动时间窗内计算偏振特性,由偏振椭圆导出表征质点运动的各种属性,并利用质点运动的特征构建偏振滤波器。本文对3分量合成地震记录和野外探测实验的实际3分量记录进行偏振分析研究,并在此基础上进行偏振滤波,有效地提高了信噪比。The paper introduces a method of polarization analysis and its application for seismic signal detection. This method is based on Flinn＇s algorithm in time domain. Calculation of the data polarization characteristics can be done through calculating the eigenstructure of the eovariance matrix in each moving data window. And the polarization filter is designed according to the characteristics of the particle motion to improve the signal to noise ratio （SNR） of the seismic record. Synthetic three-component seismic data and real data from field experiment have been applied and the filtered results show the high efficiency of this method.

关 键 词：3分量地震记录 偏振分析 偏振滤波 

分 类 号：P315[天文地球—地震学]