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震源定位是微地震监测关键技术之一。本文提出用于微地震定位的弹性波和加权弹性波(WEW)干涉成像方法。该方法在保证定位精度的同时,还可避免震源假象。通过各向同性水平层介质状模型的数值试验,初步表明该方法可适应低信噪比微震信号、速度随机扰动、较稀疏的检波器分布等情况,并在速度模型存在一定的系统误差时也仍保持较高的定位精度。由于干涉成像方法不需要进行初至拾取,定位效率相对传统走时方法也得到了提高。采用二维断层模型试算Nnumerical results of using a two-dimensional fault model,表明方法还能实现多震源定位,且比逆时成像有更高的定位精度。
Source positioning is one of the key technologies of micro-seismic monitoring. In this paper, the elastic wave and weighted elastic wave (WEW) interferometric imaging method for micro-seismic location is proposed. The method can ensure the positioning accuracy, but also can avoid the source illusion. Through the numerical experiment of the isotropic horizontal layered medium model, it is shown that this method can adapt to the low signal-to-noise microseismic signal, the random disturbance of velocity and the sparse detector distribution. When the velocity model has some systematic errors Still maintain a high positioning accuracy. Since the interference imaging method does not require the first arrival pick-up, the positioning efficiency is also improved relative to the traditional travel time method. Using two-dimensional fault model to calculate Nnumerical results of using a two-dimensional fault model, shows that the method can also achieve multi-source localization and has higher positioning accuracy than inverse time imaging.