基于DFA方法的台基噪声非平稳特征  

Non-stationary Property of Ambient Noise Based on DFA Method

作　　者：赵瑞[1,2] 李俊超 贺北芳[1,2] ZHAO Rui;LI Junchao;HE Beifang(Key Laboratory of Earthquake Geodesy,Institute of Seismology,China Earthquake Administration,Wuhan 430071,China;Hubei Earthquake Agency,Wuhan 430071,China)

机构地区：[1]中国地震局地震研究所地震大地测量重点实验室,武汉430071 [2]湖北省地震局,武汉430071

出　　处：《华北地震科学》2020年第4期55-60,共6页North China Earthquake Sciences

基　　金：中国地震局监测、预报、科研三结合课题(3JH-201901052);中国地震局地震研究所所长基金(IS201856187);中国地震局地震研究所基本科研业务费专项资助项目和中国地震局地壳应力研究所基本科研业务费专项(IS201866292-33)。

摘　　要：选取钟祥台2018年的部分连续波形记录数据,利用去趋势涨落分析方法(简称DFA方法)研究该台台基噪声,涉及到单纯的地动噪声以及地震发生时的噪声非平稳特征,主要研究其三分向标度指数的变化关系,结果表明:无地震时噪声具有长程相关性,表现为序列内部的相似度,地震发生时压制了地动噪声,水平向的标度指数值明显高于垂直向,这可能与地震的方位有关。Based on the partial continuous waveform data of Zhongxiang station in 2018,the non-stationary property of the ambient noise is studied by using the Detrended Fluctuation Analysis method(DFA)including the pure ground motion noise and the ground motion noise during earthquake.This paper focuses on studying the variation relations of scaling index of the three component of seismometer.The results show that the noise has long-range coherence when there is no earthquake,which is reflected by the similarity inside the sequence,the ground motion noise is suppressed when earthquake occurs,and the horizontal scale index value is significantly higher than that in the vertical direction,which may be related to the orientation of the earthquake.

关 键 词：去趋势涨落分析 台基噪声 长程相关性 

分 类 号：P315.63[天文地球—地震学]