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用尾波干涉法监测介质波速变化研究进展
张金川1) 王勤彩2) 薛兵2) 丁莉莎3)
1)江苏省地震局, 南京210014;2)中国地震局地震预测研究所,北京100036;3)广东省地震局,广州510070
摘要:
多次散射形成的尾波由于在介质内部重复采样、迭加和放大的作用,对介质的微小变化十分敏感.尾波干涉法利用尾波的这一特点检测介质的微小变化.近年来利用尾波干涉法高精度检测介质波速变化已经广泛应用到地震学领域和材料无损检测中.本文从尾波干涉法的原理和方法及研究进展两方面进行介绍,着重介绍了重复地震、噪声和人工源在研究介质速度变化中取得的成果.利用尾波干涉法,可以更精细地了解介质动态演化过程.
关键词:  波速变化  尾波干涉法  互相关  重复地震  背景噪声
DOI:
分类号:
基金项目:
Monitoring Media Velocity Variations with Coda Wave Interferometry
Zhang Jinchuan1),Wang Qincai2),Xue Bing2),and Ding Lisha3)
1) Earthquake Administration of Jiangsu Province,Nanjing 210014,china ; 2) Institute of Earthquake Science,CEA,Beijing 100036,China ; 3) Earthquake Administration of Guangdong Province,Guangzhou 510070,China
Abstract:
Multiply scattered waves are sensitive to media changes owing to the effect of repeated sampling,superposition and amplification. Based on this characteristic,small-medium changes could be detected by using coda wave interferometry. In recent years,coda wave interferometry has been widely used in estimating velocity variation with high precision in areas such as seismology and non-destructive testing. This paper systematically presents the principle and research status of coda wave interferometry,and especial focus is placed on the research of media velocity variations by using repeating earthquakes,artificial sources,and ambient noise. Applications of coda wave interferometry can contribute to the more subtle understanding of dynamic evolution process in the medium.
Key words:  Coda wave interferometry  Cross-correlation  Velocity variations