Interseismic and coseismic deformation of the 2023 Jjishishan Ms6.2 earthquake determined by GNSS and InSAR data  

作　　者：Changyun Chen Yanqiang Wu Ming Hao Fan Yang Shengpeng Zhang Yajin Pang Qingyun Zhang Nannan Guo Hongbao Liang Wei Zhan 

机构地区：[1]The First Monitoring and Application Center,China Earthquake Administration,Tianjin 300180,China [2]The Second Monitoring and Application Center,China Earthquake Administration,Xi'an 710054,China [3]Qinghai Basic Surveying and Mapping Institute,Xining 810001,China

出　　处：《Geodesy and Geodynamics》2025年第2期127-136,共10页大地测量与地球动力学(英文版)

基　　金：the National Natural Science Foundation of China(Grant No.42204008);the National Key Research and Development Program of China(No.2022YFC3003703);the Scientific Research Project Coordinating Fund of the First Monitoring and Application Center,China Earthquake Administration(No.FMC2022014);The Sentinel-1 data were provided by the European Space Agency(ESA)。

摘　　要：Quantitative studies on the interseismic and coseismic deformation characteristics and analysis of the interplay between the seismogenic fault and neighboring faults are crucial for understanding the kinematic features and assessing potential seismic hazards.In this study,the interseismic and coseismic deformation of the 2023 Jishishan Ms6.2 earthquake(JSSEQ),including the strain rate field,the slip rates,and locking depths of the seismogenic fault during the interseismic period,were obtained.Moreover,the coseismic slip distribution and geometric attributes of the seismogenic fault were further examined.Finally,the potential earthquake hazard in the vicinity was identified by analyzing the Coulomb failure stress changes(△CFS).Before the JSSEQ,the maximum shear and dilatational strain rates near the epicenter were significantly lower,and the seismogenic fault was strongly coupled with thrust and dextral strike-slip motion.The maximum displacement of GNsS stations is about 25 mm,about 11 km southwest of the epicenter.The ascending and descending observations reveal a significantly thrustdominated movement,with maximum line of sight displacements of 78 and 83 mm,respectively.Comparing two coseismic slip distribution results and previous studies,it is considered that the east dipping seismogenic fault is more reasonable.The coseismic fault slip took place at a depth of 7.1-13.2 km,with a maximum slip of 0.43 m and a moment magnitude of 6.1.The earthquake resulted in noticeable stress loading on the southeastern end of the Lajishan north margin fault zone and the Lajishan south margin fault zone,as well as the western end of the West Qinling fault zone,which should begivenmoreattention infuture.

关 键 词：Gansu Jishishan earthquake Interseismic strain rate field Intersesimic slip rate Slip distribution inversion Seismic risk assessment 

分 类 号：P315.7[天文地球—地震学]