一种提高地震信号方位角估算质量的偏振分析法

A Modified Polarization Analysis Approach for Improving the Quality of Azimuth Estimation

为了提高三分向台站方位角计算的准确性,结合DRSN软件处理方法的思想,在原有采用固定频带滤波后进行偏振分析的基础上增加了信号检测频带,选择最佳结果作为偏振分析结果。测试结果表明:该方法提高了能量分布在较窄频带的震相和分布于较高频带的区域震相的偏振分析质量,有效改善了方位角估算的准确性;对于方位角残差不具备正态分布的台站,其结果没有改善。

Polarization analysis is used on 3-Component stations data to estimate the azimuth and slowness at CTBT BeiJing NDC.In order to improve the quality of azimuth estimation ,in this work,polarization analysis was conducted in the detection filter band in addition to the original fixed band .The testing shows the method effec-tively enhanced the quality of polarization analysis for arrivals with energy only covering a narrow frequency and for regional arrivals located in a higher frequency band .The accuracy of the azimuths estimation was improved . The new approach was not effective for stations without normal distribution of azimuth residuals .