Rapid rupture characterization for the 2023 M_(S)6.2 Jishishan earthquake  

作　　者：Xiongwei Tang Rumeng Guo Yijun Zhang Kun Dai Jianqiao Xu Jiangcun Zhou Mingqiang Hou Heping Sun 

机构地区：[1]State Key Laboratory of Geodesy and Earth's Dynamic,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan,430077,China [2]College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing,100101,China [3]Hubei Luojia Laboratory,Wuhan,430079,China

出　　处：《Earthquake Research Advances》2024年第2期22-26,共5页地震研究进展（英文）

基　　金：supported by the Open Fund of Hubei Luojia Laboratory(230100015);the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB41000000);the Knowledge Innovation Program of Wuhan-Shuguang Project(2023010201020281).

摘　　要：On December 18, 2023, the M_(S)6.2 Jishishan earthquake occurred in the northeastern region of the QinghaiXizang Plateau, causing heavy casualties and property damage in Gansu and Qinghai Provinces. In this study,we integrate space imaging geodesy, finite fault inversion, and back-projection methods to decipher its rupture property, including fault geometry, coseismic slip distribution, rupture direction, and propagation speed. The results reveal that the seismogenic fault dips to the southwest at an angle of 29°. The major slip asperity is dominated by reverse slip and is concentrated within a depth range of 7–16 km, which explains the significant uplift near the epicenter observed by both the Sentinel-1 ascending and descending In SAR data. Moreover, the teleseismic array waveforms indicate a northwest propagating rupture with an overall slow rupture velocity of~1.91 km/s(AK array) or 1.01 km/s(AU array).

关 键 词：Jishishan earthquake Rupture property Space imaging geodesy Finite fault inversion Back-projection method 

分 类 号：P315.7[天文地球—地震学]