基于小波包变换的重叠地震波分离

摘要

利用dmey小波包变换提取时频特征,采用阈值熵搜索最优小波包基方法,用Matlab语言编程,实现对重叠地震信号的分离.通过对2009年2月20日柯坪M5.2地震波和其后ML4.7余震的研究,发现用该方法能清楚地找到同源地震重叠的位置,为地震定位提供准确、可靠的震相识别依据,从而提高地震定位的精度.%In the paper, the separation of overlapped seismic signal and the extraction of time-frequency features with dmey wavelet package transform are realized by the Matlab programming based on threshold entropy optimum wavelet packet group searching method. The study of Keping MS 5. 2 earthquake and follow-up ML 4. 7 aftershock has shown that the method can clearly find the overlapping position of homologous seismic, providing accurate, reliable phase identification and improving the precision of earthquake location for earthquake location.