用扩散波定位弱变化（LOCADIFF）：理论方法和反演程序
Locating a weak change using diffuse waves (LOCADIFF) : theoretical approach and inversion procedure
摘要：
我们描述了一种时间分辨监测技术的异构介质。我们的方法是基于在固定位置，但在不同的日期获得的尾波波形的交叉相干的空间变化。为了定位和表征连续采集之间发生的弱变化，我们使用极大似然方法结合扩散传播模型。我们说明这种技术，称为LOCADIFF，数值模拟。在几个说明性的例子中，我们表明，可以定位的变化与几个波长的精度和其有效的散射截面可以检索。该方法的精度取决于源接收器对的数量，时间窗口的尾波，和传播模型中的错误进行了研究。该技术在现实世界中的实验应用的限制进行了讨论。
英文摘要：
We describe a time-resolved monitoring technique for heterogeneous media. Our approach is based on the spatial variations of the cross-coherence of coda waveforms acquired at fixed positions but at different dates. To locate and characterize a weak change that occurred between successive acquisitions, we use a maximum likelihood approach combined with a diffusive propagation model. We illustrate this technique, called LOCADIFF, with numerical simulations. In several illustrative examples, we show that the change can be located with a precision of a few wavelengths and its effective scattering cross-section can be retrieved. The precision of the method depending on the number of source receiver pairs, time window in the coda, and errors in the propagation model is investigated. Limits of applications of the technique to real-world experiments are discussed.
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