西藏中部格仁错断裂中段曲巴晚第四纪活动特征与古地震事件  

Late Quaternary Activities and Paleoearthquakes at Quba Along Middle Segment of Gyaring Co Fault in Central Tibet

作　　者：王度 陈立春 李彦宝[2] 杜金花 贾永顺 薛柯依 王旭龙[4] 尹功明[2] WANG Duo;CHEN Lichun;LI Yanbao;DU Jinhua;JIA Yongshun;XUE Keyi;WANG Xulong;YIN Gongming(Guangxi Key Laboratory of Exploration for Hidden Metallic Ore Deposits,College of Earth Sciences,Guilin University of Technology,Guilin 541006,China;State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China;School of Earth Science and Resources,Chang’an University,Xi’an 710054,China;State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China)

机构地区：[1]桂林理工大学地球科学学院广西隐伏金属矿产勘查重点实验室,广西桂林541006 [2]中国地震局地质研究所地震动力学国家重点实验室,北京100029 [3]长安大学地球科学与资源学院,西安710054 [4]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061

出　　处：《华南地震》2024年第4期1-10,共10页South China Journal of Seismology

基　　金：第二次青藏高原综合科学考察研究(2019QZKK0901);广西自然科学基金(2024GXNSFAA010357);国家自然科学基金(41902219);桂林理工大学科研启动基金(GUTQDJJ2022037)联合资助。

摘　　要：格仁错断裂晚第四纪古地震研究是理解青藏高原中部构造变形与地震危险性评价关键环节。通过在格仁错断裂中段曲巴开展野外调查、无人机摄影测量、探槽开挖、光释光与碳十四测年工作,探槽揭露出5次古地震事件:E1(59.0±2.1 ka BP)、E2(57.1±2.2 ka BP)、E3(30.2±1.4 ka BP)、E4(12.5±0.6 ka BP)、E5(2.2~3.2 ka BP)。最新事件的离逝时间已超过2.2±0.3 ka,接近估算的M_(W)7.4地震复发间隔,指示格仁错断裂中段存在较强地震风险。The study of Late Quaternary paleoearthquakes of the Gyaring Co Fault is a key link in understanding the tectonic deformation and seismic hazard assessment in the Central Tibet.This paper conducted field investigations,unmanned aerial vehicle photogrammetry,trench excavation,optically stimulated luminescence(OSL)dating,and radiocarbon dating at Quba along the middle segment of the Gyaring Co Fault.Five paleoearthquakes were identified:E1(59.0±2.1 ka BP),E2(57.1±2.2 ka BP),E3(30.2±1.4 ka BP),E4(12.5±0.6 ka BP),and E5(2.2-3.2 ka BP).The results reveal that the elapsed time of the latest event is over 2.2±0.3 ka,which approaches the estimated recurrence interval of the M_(W) 7.4 earthquake.It indicates strong seismic risk along the middle segment of the Gyaring Co Fault.

关 键 词：青藏高原 格仁错断裂 晚第四纪 古地震 光释光测年 

分 类 号：P315.2[天文地球—地震学]