用尾波干涉法监测介质波速变化研究进展

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。

Monitoring Media V elocity Variations with Coda Wave Interferometry

Multiply scattered waves are sensitive to media changes owing to the effect of re-peated sampling, superposition and amplification. Based on this characteristic, small medi-um changes could be detected by using coda wave interferometry. In recent years, coda wave interferometry is widely used in estimating velocity variation with high precision in areas such as seismology and non-destructive testing. This paper systematically presents the principle, method and research status of coda wave interferometry respectively, especially focusing on research advances of media velocity variations by using repeating earth-quake,artificial source, and ambient seismic noise. Applications of coda wave interferome try can contribute to the more subtle understanding of dynamic evolution process in the medium.