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地球背景噪声干涉应用研究的新进展
王伟涛1, 倪四道2, 王宝善1
1.中国地震局地球物理研究所,北京市海淀区民族大学南路5 号100081;2.中国科学院测量与地球物理研究所,武汉430077
摘要:
对地震台记录到的长时间的地球背景噪声进行互相关处理,得到的互相关函数可以近似地表征这两个台站之间的格林函数,这种数据处理方法被称为背景噪声干涉。近年来,背景噪声干涉研究在理论和实践上都有了长足进展,并被广泛用于地下波速结构及其演化规律的研究。本文首先简单介绍了背景噪声干涉研究的概念和理论依据,进而重点介绍了针对噪声源性质、互相关函数的波形到时和振幅特性的应用研究。通过对这三个方面研究的回顾,分析总结了该研究领域的新进展及需要解决的问题,并对背景噪声干涉研究的新特点进行了分析和展望。
关键词:  背景噪声  互相关  格林函数  地震成像
DOI:
分类号:
基金项目:中国地震局地球物理研究所基本科研专项(DQJB10A01,DQJB10B20,DQJB11C05); 国家自然科学基金(41004019,40874095)共同资助
New advances in application of ambient noise interferometry
Wang Weitao1, Ni Sidao2, Wang Baoshan1
1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China;2.Institute of geodesy and geophysics,Chinese Academy of Science,Wuhan 430077,China
Abstract:
Ambient noise seismic interferometry is the methodology by which the Green's Function between two seismic stations can be extracted from long time cross correlation of ambient noise recorded by these two stations. Recent years,seismic interferometry based on ambient noise gains lots of advances both in theoretical derivations and practical applications,including ambient noise tomography as well as time lapse monitoring of velocity variations and many others. In this paper,we first give a brief introduction to the concept and theory of seismic interferometry,then put more words on the new advances in its applications. After introduction and discussion on the advances and barriers related to research on ambient noise source properties,phase and amplitude of noise cross correlation function,we show the new trend in ambient noise interferometry processing.
Key words:  Ambient noise  Cross-correlation  Green function  Seismic imaging