高斯线调频小波变换及其在地震震相识别中的应用

英文篇名：GAUSS LINEAR FREQUENCY MODULATION WAVELET TRANSFORM AND ITS APPLICATION TO SEISMIC PHASES IDENTIFICATION
中文刊名：地震学报
英文刊名：Acta Seismologica Sinica
作者：刘希强 ; 周蕙兰 ; 曹文海 ; 李红 ; 李永红 ; 季爱东
英文作者：Liu Xiqiang1) Zhou Huilan2) Cao Wenhai3) Li Hong1) Li Yonghong1) Ji Aidong1) 1) Seismological Bureau of Shandong Province ; Jinan 250014 ; China 2) Graduate School ; Chinese Academy of Sciences ; Beijing 100039 ; China 3) Seismological Bureau of Weihai City ; Weihai 264200 ; China
中文关键词：高斯线调频小波 ; 小波变换 ; 渐变地震信号初至识别
英文关键词：Gauss linear frequency modulation wavelet ; wavelet transform ; gradual change style seismic signal onset identification
出版日期：2002-12-15
机构：山东省地震局 ,中国科学院研究生院 ,威海市地震局 ,山东省地震局 ,山东省地震局 ,山东省地震局中国济南250014,中国北京100039,中国山东威海264200,中国济南250014,中国济南250014,中国济南250014
年：2002
期：06
出版单位：地震学报

摘要

基于地震渐变信号在起始点附近信号高频分量比较丰富,但信号幅度较小的特点,本文选取高斯线调频小波作为基函数,研究了不同小波参数和信号参数对其变换结果的影响规律,找出了直接利用变换峰值进行震相识别的误差来源,提出了一种从背景噪声中实现渐变地震震相识别的有效方法——定尺度小波变换比方法,给出了模拟数字信号和实际地震震相识别的实例.
Based on the characteristics of gradual change style seismic signal onset which has more high frequency signal components but less magnitude, this paper selects Gauss linear frequency modulation wavelet as base function to study the change characteristics of Gauss linear frequency modulation wavelet transform with difference wavelet and signal parameters, analyzes the error origin of seismic phases identification on the basis of Gauss linear frequency modulation wavelet transform, puts forward a kind of new method identifying gradual change style seismic phases with background noise which is called fixed scale wavelet transform ratio, and presents application examples about simulation digital signal and actual seismic phases recording onsets identification.

引文

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