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准确的震源定位是微震研究的基础。针对微震定位误差较大的情况,探究了台阵密度同定位误差之间的联系。通过建立了立体监测体系模型,以到时差为变量建立目标方程,采用粒子群算法进行定位求解,研究了定位方法、波速误差和震源位置对定位的影响;根据现场试验,分析了台阵密度对定位的影响。研究发现,波速误差对定位误差有着极大影响,且定位波速过小带来的误差更大;台站包络范围内的定位效果好于外部,波速误差越大,效果越明显。台阵密度对定位的影响体现在两方面:第一,台站阵面数量,定位精度从高到低依次是多阵面,近震源单阵面,远震源单阵面;第二,台站的数量,采用多阵面定位时,震源定位误差同台站数量呈负指数相关。研究成果可以为矿山微震监测和中小尺度微震的研究提供一定的参考作用。
Accurate source positioning is the basis of microseismic research. Aiming at the situation of large microseismic location error, the relationship between array density and positioning error is explored. Through the establishment of a three-dimensional monitoring system model, the target equation is established with time difference as a variable, and the particle swarm optimization algorithm is used to locate and solve the problem. The influence of positioning method, wave velocity error and source location on localization is studied. The impact of positioning. It is found that the error of wave velocity has great influence on the position error, and the error caused by the too small wave velocity of positioning is greater. The effect of localization within the envelope of the station is better than that of the outside. The larger the error of wave velocity is, the more obvious the effect is. The effect of array density on positioning is reflected in two aspects. First, the number and positioning accuracy of the station fronts are multifold, near-source singlet and far source singles; secondly, the station When using multi-facet positioning, the error of source positioning is negatively correlated with the number of stations. The research results can provide a reference for the microseismic monitoring of mines and the study of microseism at the small and medium scale.