Monitoring temporal variations of seismic velocities in underground mines using seismic interferometry

采矿公司正面临着开采越来越深的矿体（即深至几公里）所带来的业务和地质技术方面的挑战。在这种深度的压力条件下，岩石不稳定的风险很高。这些事件构成安全风险并扰乱生产。因此，矿业公司面临的一个重要挑战是监测与采矿有关的岩体的变化情况，以减轻安全威胁并尽量减少生产期间的中断。几十年来，研究表明，通过介质传播的地震波获得的地下地震图像，一种称为地震层析成像的技术，可以通过估计应力局部化的时间变化和三维分布（时空变化）来提供岩体响应的信息。然而，传统地震层析成像技术提供的时空分辨率取决于周围介质中微地震事件的速率和空间分布，因此不是恒定的。在这个

Mining companies are facing operational and geotechnical challenges associated with mining increasingly deeper ore bodies (i.e., down to a few kilometers). Pressure conditions at such depths present high risks of rock instability. These occurrences pose safety risks and disrupt production. One important challenge faced by mining companies is therefore to monitor the changing conditions of the rock mass related to mining to mitigate the safety threats and minimize interruptions during production. For decades, studies have shown that seismic images of the subsurface obtained from seismic waves propagating through the medium, a technique called seismic tomography, can provide information on the rock mass response by allowing the estimation of the temporal variation and 3D distribution (spatio-temporal variation) of stress localization. However, the spatio-temporal resolution afforded by conventional seismic tomography techniques depends on the rate and the spatial distribution of microseismic events in the surrounding medium and is therefore not constant. In this