Slip rate and interseismic coupling along the Moxi-Shimian segment of the Xianshuihe fault, Eastern Qinghai-Xizang Plateau

被引:1
作者
Zhao, Xinyu [1 ]
Liu, Gang [1 ,2 ]
Nie, Zhaosheng [1 ,2 ]
Xiong, Wei [1 ]
Chen, Wei [1 ]
Lin, Mu [1 ]
Wang, Dijin [1 ]
Li, Qi [1 ]
Yu, Jiansheng [3 ]
Wang, Dongzhen [1 ]
Yu, Pengfei [1 ]
机构
[1] China Earthquake Adm, Inst Seismol, Wuhan 430071, Peoples R China
[2] China Earthquake Adm, Key Lab Earthquake Geodesy, Wuhan 430071, Peoples R China
[3] Chinese Acad Sci, Innovat Acad Precis Measurement Sci & Technol, State Key Lab Geodesy & Earths Dynam, Wuhan 430077, Peoples R China
关键词
Moxi-Shimian segment of Xianshuihe fault; Luding earthquake; Global positioning system; Interseismic kinematic parameters; SICHUAN-YUNNAN REGION; WESTERN SICHUAN; DEFORMATION; ZONE; INVERSION; BOUNDARY; PATTERN; MOTION; FIELD;
D O I
10.1016/j.geog.2024.01.004
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
On September 5, 2022, the Luding M 6.8 earthquake occurred in the Moxi-Shimian segment of the Xianshuihe fault, coinciding with the historical ruptured zone of the 1786 Moxi earthquake. Its seismogenic environment provides a foundation for comprehending the mechanism of the earthquake and its future hazard. In the Moxi-Shimian segment, we establish a series of near- field Global Navigation Satellite Systems (GNSS) stations to enhance the spatial resolution of observational data for the inversion of the interseismic kinematic parameters. In this study, with an elastic screw dislocation model constrained by GNSS observations, the slip rate of the Moxi-Shimian segment is estimated to be 10.9 +/- 1.0 mm/yr, while the locking depth is 15.7 +/- 6.2 km. Additionally, we utilize a block-dislocation model to invert the interseismic fault coupling along the Kangding-Moxi-Shimian segment. The result indicates a gradual deepening of the locking depth along the section from Kangding to Shimian. The coseismic rupture of the 2022 event occurred within the high coupling regions in the Kangding-MoxiShimian segment, which indicates that the rupture kinematics in this event might be controlled by the interseismic deformation. The seismic moment accumulated within the ruptured zone of the Luding earthquake since 1786 ranges in [1.42-3.40] x 10 19 N $m, which is signi ficantly greater than the seismic moment released during the 2022 event. As a result, we infer that the Luding earthquake released only a portion of the accumulated energy within the original rupture zone since 1786, indicating that the 2022 event has not caused a complete rupture in the Moxi-Shimian segment. Consequently, there remains a substantial seismic hazard in this area. (c) 2024 Editorial of fice of Geodesy and Geodynamics. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:338 / 351
页数:14
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