基于密集台阵的辽宁老虎台矿区微震事件重定位  

Microseismic Events Relocation of Laohutai Coal Mine in Liaoning Province Based on Dense Seismic Array

作　　者：孔庆翰 吕子强 张广伟 Kong Qinghan;LüZiqiang;Zhang Guangwei(College of Mining,Liaoning Technical University,Fuxin 123000,Liaoning,China;National Institute of Natural Hazards,Ministry of Emergency Management of China,Beijing 100085,China)

机构地区：[1]辽宁工程技术大学矿业学院,辽宁阜新123000 [2]应急管理部国家自然灾害防治研究院,北京100085

出　　处：《吉林大学学报（地球科学版）》2024年第5期1685-1695,共11页Journal of Jilin University：Earth Science Edition

基　　金：国家自然科学基金项目(42274129)。

摘　　要：辽宁抚顺老虎台煤矿开采已百年有余,是矿震灾害较为严重的矿区之一。然而,该地区地震监测台站较少,导致对该矿区的微震监测能力有所不足。为了更好地监测老虎台矿区微震的活动情况,本研究基于2019年11月3—25日在矿区布设的两条线性密集台阵,开展矿区微震事件的双差定位研究。重定位结果显示:本次微震活动的最大事件为发生于浑河断裂附近的M_(L)2.4级地震,震源深度为0.5 km。在浑河M_(L)2.4级地震发生之前,M_(L)>1.0的微震事件逐渐增多且有向浑河断裂西端迁移的特征;在浑河M_(L)2.4级地震发生之后,微震活动主要集中于矿区内部的F_(1)和F_(2)断层附近,震源深度主要集中在0.2~1.5 km之间。基于微震事件的时空分布特征,推测老虎台矿区内部的微震活动可能受到浑河M_(L)2.4级地震的影响,矿区内部可能发生断层活化现象。此外,矿区内部的F 2断层可能是一条延伸至浑河断裂的NNW向隐伏断层。Laohutai coal mine,located in Fushun,Liaoning Province,has been exploited for almost a century and is one of the mining areas with serious mine earthquake disasters.However,due to the lack of dense seismic monitoring stations,the mine’s microseismic event monitoring capacity is insufficient.In order to monitor the microseismic activity better,this study carried out double-difference location of microseismic events in the mining area based on two linear dense seismic arrays deployed in Laohutai coal mine from November 3 to 25,2019.The relocation results indicate that the largest event of this microseismic activity was the M_(L)2.4 earthquake that occurred near Hunhe fault,with an epicenter depth of 0.5 km.Before the occurrence of the Hunhe M_(L)2.4 earthquake,the microseismic events of M_(L)>1.0 gradually increased and migrated to the western end of Hunhe fault.After the occurrence of the Hunhe M_(L)2.4 earthquake,the microseismic activities in the mining region were mainly concentrated near F_(1)and F_(2)faults in the mining area,and the depth of the epicenter was mainly concentrated between 0.2-1.5 km.The spatial and temporal distribution characteristics of the microseismic events indicate that the microseismic activity in Laohutai coal mine may be affected by the Hunhe M_(L)2.4 earthquake,and fault activation may occur in the mining area.Additionally,we speculate that the F 2 fault may be a NNW-trending buried fault extending to Hunhe fault based on the observed distribution of the microseismic relocation.

关 键 词：老虎台矿区 密集台阵 微震监测 双差定位 浑河断裂 矿震灾害 

分 类 号：P315[天文地球—地震学]