基于高密度台阵的小尺度区域微震定位研究  

Microseism location in local scale region based on high-density array

作　　者：贾宝新[1,2] 贾志波 赵培[1] 陈扬[1] 

机构地区：[1]辽宁工程技术大学土木与交通学院,辽宁阜新123000 [2]中国地震局地质研究所,北京100000

出　　处：《岩土工程学报》2017年第4期705-712,共8页Chinese Journal of Geotechnical Engineering

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)

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。Accurate source location is the basis of most micro seismic studies. Because of large location error, the relationship between station density and location error is analyzed. A 3-D monitoring system model is established, and the target equation is set up by using the time difference. The influences of location method, velocity error and source position on source location are studied by using the PSO algorithm. It is found that the wave velocity error has a great influence on the location error, and the error caused by low velocity is higher. The location in station envelope is better than that in the external. The higher the velocity error, the more obvious the effect. The station density has a significant effect on the source location which is mainly reflected in two aspects： the first is the number of station plane, the location accuracy from high to low followed by the arrays of multiple plane, single plane near source, single plane far from source; the other is the number of sensors, and the number of the whole monitoring system has a close relationship with the station number. It is shown that there is a negative exponential relationship between the location error and the station number. The results of this study can provide some reference for the researches on mine seismic monitoring and local scale earthquakes.

关 键 词：小尺度区域 微震定位 台站数量 波速误差 震源位置 

分 类 号：TU435[建筑科学—岩土工程]