盖州青石岭震群断层面参数的确定及构造应力场特征研究  

Study on Determination of Fault Plane Parameters and Characteristics of Tectonic Stress Field of Gaizhou Qingshiling Earthquake Swam

作　　者：戴盈磊[1] 张文静 惠杨 底欣欣[1] 杨晓东[1] DAI Yinglei;ZHANG Wenjing;HUI Yang;DI Xinxin;YANG Xiaodong(Liaoning Earthquake Agency,Liaoning Shenyang 110034,China)

机构地区：[1]辽宁省地震局,辽宁沈阳110034

出　　处：《防灾减灾学报》2024年第1期1-8,共8页Journal of Disaster Prevention And Reduction

基　　金：辽宁省地震局预研孵化基金项目(LZ2022001);中国地震局地震应急青年重点任务(CEA_EDEM-20240203,CEAEDEM202305);中国地震局地震科技星火计划项目(XH24009YA)。

摘　　要：根据之前学者的双差定位结果,使用Fit_Fault软件包计算盖州青石岭震群发震断层面走向为114.30°,倾角74.67°。收集2001年至2011年辽宁地区的震源机制解资料,采用全局网格搜索算法,反演该地区的构造应力场,其主压应力轴为NEE向,主张应力轴为NNW向,整体呈现拉张的应力状态。并据此确定出青石岭震群发震断层的滑动角是35.49°,为左旋走滑性质。模拟在辽宁地区构造应力体系下各种产状的断层面上可产生的相对剪应力和相对正应力分布情况,发现该震群发震断层面上的相对剪应力和相对正应力分别为0.513和0.576。分析认为盖州青石岭震群是一处地质薄弱带,背景构造应力场在其最近一期的活动中未起主导作用。According to the double-difference earthquake location result of previous scholars,the Fit_Fault software package is used to calculate the strike of the fault plane of the Qingshiling earthquake swarm in Gaizhou is 114.30°and the dip angle is 74.67°.The focal mechanism solution data of the Liaoning region from 2001 to 2011 were collected.The global grid search algorithm is used to invert the tectonic stress field in this area.The principal compressive stress axis is in the NEE direction,and the asserted stress axis is in the NNW direction,showing an overall tensile stress state.Based on this,it is determined that the slip angle of the fault of the Qingshiling earthquake swarm is 35.49°,which is a sinistral strike-slip property.By simulating the distribution of relative shear stress and relative normal stress on the fault plane of various occurrences under the tectonic stress system in Liaoning area,it is found that the relative shear stress and relative normal stress on the fault plane of the earthquake swarm are 0.513 and 0.576 respectively.The analy sis shows that the Qingshiling earthquake swam in Gezhou is a geological weak zone,and the background tectonic stress field does not play a leading role in its recent activity.

关 键 词：青石岭震群 断层面参数 震源机制解 应力场 辽宁地区 

分 类 号：P315.7[天文地球—地震学]