标题： 关于噪声相关干涉测量的精度 显示英文标题

标题： On the precision of noise correlation interferometry

摘要： 长时间的噪声看起来的波形，如在随机多重散射和混响介质中获得的波形，是复杂的；它们难以直接解释。 然而，这样的波形对波源或其传播介质中的微小变化很敏感。 监测这种波形，无论是直接获得还是通过噪声相关间接获得，正逐渐成为检测介质变化的技术。 变化的解释在原则上是有问题的；并不总能清楚地判断变化是由于源还是由于介质。 特别感兴趣的是传播速度的小变化的检测。 这里推导了一个表达式，用于由于源的变化而产生的明显但虚假的波形膨胀。 该表达式允许以高精度区分由于波速变化引起的波形变化与其他原因引起的波形变化。 该理论成功地与实验室超声数据集和加利福尼亚帕克菲尔德的地震数据集的分析进行了比较。 显示英文摘要

摘要： Long duration noisy-looking waveforms such as those obtained in randomly multiply scattering and reverberant media are complex; they resist direct interpretation. Nevertheless, such waveforms are sensitive to small changes in the source of the waves or in the medium in which they propagate. Monitoring such waveforms, whether obtained directly or obtained indirectly by noise correlation, is emerging as a technique for detecting changes in media. Interpretation of changes is in principle problematic; it is not always clear whether a change is due to sources or to the medium. Of particular interest is the detection of small changes in propagation speeds. An expression is derived here for the apparent, but illusory, waveform dilation due to a change of source. The expression permits changes in waveforms due to changes in wavespeed to be distinguished with high precision from changes due to other reasons. The theory is successfully compared with analysis of a laboratory ultrasonic data set and a seismic data set from Parkfield California.