基于高密度台阵的小尺度区域微震定位研究

发布时间：2018-12-14 08:09

【摘要】：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。
[Abstract]:Accurate focal location is the basis of microseismic research. The relationship between array density and positioning error is discussed. Through the establishment of a stereoscopic monitoring system model, the objective equation is established with the time difference as the variable, and the particle swarm optimization algorithm is used to solve the problem. The influence of the positioning method, the wave velocity error and the location of the source on the location is studied. Based on the field test, the influence of array density on positioning is analyzed. It is found that the error of wave velocity has a great influence on the positioning error, and the error caused by the small wave velocity is even greater, and the positioning effect in the envelope range of the station is better than that in the outside, and the greater the error of the wave velocity, the more obvious the effect is. The influence of array density on the location is reflected in two aspects: first, the number of the array surface, the location accuracy from high to low are multi-array plane, near source single array plane and far source single array plane; Second, the number of stations is negative exponentially correlated with the number of stations. The research results can provide some reference for mine microseismic monitoring and meso-scale microseismic research.
【作者单位】：辽宁工程技术大学土木与交通学院;中国地震局地质研究所;
【基金】：国家重点基础研究发展计划项目(2010CB226803) 辽宁省自然科学基金项目(201602351) 地震动力学国家重点实验室开放基金项目(LED2015B01)
【分类号】：TD325.4

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