摘要
收集2020年1月19日新疆伽师M_(S)6.4地震周围及柯坪逆冲推覆构造附近震源机制解资料,应用MSATSI软件包中阻尼最小二乘法反演该地震震中周围的构造应力场。结果表明,研究区主压应力轴方向呈近NS向且整体一致性较好,西段最大主应力方向为NNW向,东段为NNE向,但西段中的喀什、巴楚等靠近塔里木块体边缘地区主压应力方向为NNE向。柯坪逆冲推覆构造带所在区域的主压应力方向呈NNW向,主张应力方向呈NNE向,与此次地震的震源机制解P、T轴方向相同,表明该地震的发生受区域构造应力场影响。研究区整体张轴的非均匀性明显,方位分布范围较大,但地震震中周围主压应力轴倾伏角一致性特征明显,反映了该区域以逆冲为主的应力特征。
Collect the focal mechanism solution data around the Jiashi M_(S)6.4 earthquake in Xinjiang on January 19,2020 and Keping thrust nappe structure,and use the damped least squares in MSATSI software package to invert the tectonic stress field around the epicenter of the earthquake.The results show that the direction of the principal compressive stress axis in the study area is nearly NS and the overall consistency is good.The maximum principal stress direction in the west section is NNW and the east section is NNE,but the main compressive stress direction in Kashgar,Bachu and other areas near the edge of the Tarim block in the west section is NNE.The direction of the principal compressive stress in the area where the Keping thrust nappe structural belt is located is NNW,and the direction of the principal tensile stress is NNE,which is the same as the direction of the P and T axes of the focal mechanism solution of the earthquake,indicating that the occurrence of the earthquake is affected by the regional tectonic stress field.The overall tension axis in the study area has obvious non-unifbrmity and wide azimuth distribution,but the main compressive stress axis a-round the earthquake epicenter has obvious dip angle consistency,which reflects the stress characteristics of the region dominated by thrust.
作者
雷啸宇
刘兆才
赵鹏毕
王伽祺
沙木哈尔•叶尔肯
LEI Xiao-yu;LIU Zhao-cai;ZHAO Peng-bi;WANG Jia-qi;Shamuhaer Yeerken(Xinyuan Seismic Station of Earthquake Agency of Xinjiang Uygur Autonomous Region,Xinyuan 835800,Xinjiang,China;Shenzhen Institute of Disaster Prevention and Mitigation Technology,Shenzhen 518003,Guangdong,China)
出处
《内陆地震》
2023年第1期99-105,共7页
Inland Earthquake
基金
新疆地震青年科学基金(202126).
