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The Theory of Coda Wave Interferometry

机译:尾波干涉法理论

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Coda waves are sensitive to changes in the subsurface because the strong scattering that generates these waves causes them to repeatedly sample a limited region of space. Coda wave interferometry is a technique that exploits this sensitivity to estimate slight changes in the medium from a comparison of the coda waves before and after the perturbation. For spatially localized changes in the velocity, or for changes in the source location, the travel-time perturbation may be different for different scattering paths. The coda waves that arrive within a certain time window are therefore subject to a distribution of travel-time perturbations. Here I present the general theory of coda wave interferometry, and show how the time-shifted correlation coefficient can be used to estimate the mean and variance of the distribution of travel-time perturbations. I show how this general theory can be used to estimate changes in the wave velocity, in the location of scatterer positions, and in the source location.
机译:尾波对地下的变化很敏感,因为产生这些波的强烈散射使它们重复采样有限的空间区域。尾波干涉测量法是一种利用这种灵敏度从摄动前后的尾波比较中估计介质中微小变化的技术。对于速度的空间局部变化或源位置的变化,传播时间的扰动对于不同的散射路径可能是不同的。因此,在特定时间窗口内到达的尾波会受到传播时间扰动的影响。在这里,我介绍了尾波干涉测量的一般理论,并展示了时移相关系数如何可用于估计传播时间扰动的均值和方差。我将展示如何使用这种通用理论来估计波速,散射体位置和源位置的变化。

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