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

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

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  • 国家科技期刊平台
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On September 5,2022,the Luding M6.8 earthquake occurred in the Moxi-Shimian segment of the Xianshuihe fault,coinciding with the historical ruptured zone of the 1786 Moxi earthquake.Its seis-mogenic 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 con-strained 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-Moxi-Shimian 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 1019 N·m,which is significantly 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.

Moxi-Shimian segment of Xianshuihe faultLuding earthquakeGlobal positioning systemInterseismic kinematic parameters

Xinyu Zhao、Gang Liu、Zhaosheng Nie、Wei Xiong、Wei Chen、Mu Lin、Dijin Wang、Qi Li、Jiansheng Yu、Dongzhen Wang、Pengfei Yu

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Institute of Seismology,China Earthquake Administration,Wuhan 430071,China

Key Laboratory of Earthquake Geodesy,China Earthquake Administration,Wuhan 430071,China

State Key Laboratory of Geodesy and Earth's Dynamics,Innovation Academy for Precision Measurement Science and Technology,Chinese Academy of Sciences,Wuhan 430077,China

Open Fund of Wuhan,Gravitation and Solid Earth Tides,National Observation and Research StationScientific Research Fund from Institute of Seismology,CEANational Institute of Natural Hazards,Ministry of Emergency Management of ChinaNational Institute of Natural Hazards,Ministry of Emergency Management of ChinaState Key Laboratory of Geodesy and Earth's Dynamics,Innovation Academy for Precision Measurement Science and Technology,CASScience for Earthquake ResilienceNSFC

WHYWZ202301IS202216316IS202226318SKLGED2023-2-5XH2003842074015

2024

10.1016/j.geog.2024.01.004

大地测量与地球动力学(英文版)
中国地震局地震研究所

大地测量与地球动力学(英文版)

EI
影响因子：0.568
ISSN：1674-9847
年,卷(期)：2024.15(4)
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