地震工程学报2025，Vol.47Issue(3)：642-651,10.DOI:10.20000/j.1000-0844.20240131001
临潭—宕昌断裂现今闭锁程度及地震危险性分析
Present-day locking degree and seismic hazard analysis of the Lintan—Tanchang fault
摘要
Abstract
Based on two periods of global navigation satellite system(GNSS)data(2009-2013 and 2015-2019),the Tdefnode negative dislocation method was employed to invert the locking degree and slip deficit rate of the Lintan—Dangchang fault before the Minxian—Zhangxian Ms6.6 and Xiahe Ms5.7 earthquakes.Combined with the spatial distribution of small earthquakes and GNSS profile results,this study analyzed the characteristics of small earthquake activity and hori-zontal crustal movement before the two earthquakes and evaluated the future seismic hazard of the Lintan—Tanchang fault.The results show the following:(1)The seismogenic zones of the fault exhibited strong locking states before both earthquakes,with inverted locking depths gener-ally consistent with the focal depths,and the slip deficit rate of the fault was relatively low.(2)Combined with the spatial distribution of small earthquakes,seismic quiescence periods were observed before both earthquakes,and the duration of these quiescence periods was consistent with the aftershock distribution lengths.(3)GNSS profiles across the Lintan—Dangchang fault indicated that the fault currently exhibits thrust-dominated compression with sinistral strike-slip movement,and the fault slip rates were enhanced after the earthquake compared with those before the earthquake.Integrated analysis reveals stronger locking and high slip deficit rates in the eastern Lintan segment than in the Minxian—Dangchang segment and the eastern Hezuo seg-ment.As these locked zones also experienced seismic quiescence periods,attention should be focused on these two regions in future endeavors.关键词
临潭—宕昌断裂/断层闭锁/小震平静期/地震危险性Key words
Lintan—Tanchang fault/fault locking/seismic quiescence period/seismic hazard分类
天文与地球科学引用本文复制引用
赵宁远,刘雷,庄文泉,李宁,蒋锋云..临潭—宕昌断裂现今闭锁程度及地震危险性分析[J].地震工程学报,2025,47(3):642-651,10.基金项目
震情跟踪定向工作任务(2024010504) （2024010504）
