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DOI	10.1093/gji/ggae034
	Mechanism and implications of the post-seismic deformation following the 2021 Mw 7.4 Maduo (Tibet) earthquake
	Chen, Fei; Diao, Faqi; Haghighi, Mahmud Haghshenas; Wang, Yuebing; Zhu, Yage; Wang, Rongjiang; Xiong, Xiong
发表日期	2024
ISSN	0956-540X
EISSN	1365-246X
起始页码	203
结束页码	216
卷号	237 期号:1
英文摘要	A major earthquake shook the Chinese county of Maduo, located in the Songpan-Ganzi terrane on the Tibetan Plateau, on 21 May 2021. Here, we investigate the post-seismic deformation process of this event, with the aim to understand the fault geometry, friction behaviour and regional rheology. To keep the self-consistency between co- and post-seismic deformation models, we first constrain the fault geometry and coseismic slip model of this event, which are directly used in modelling the post-seismic deformation. The coseimsic slip model reveals that the majority of coseismic slip is confined at the middle (3-15 km) of the brittle layer, leading to significant shallow slip deficit. Secondly, we obtain the post-seismic deformation in the first 450 d following the 2021 Maduo earthquake using the GPS and InSAR displacement time-series data. Thirdly, a combined model incorporating afterslip and viscoelastic relaxation is built to explain the observed post-seismic deformation. Our results suggest that the viscoelastic relaxation effect should be considered in the observation period, in order to avoid the unphysical deep afterslip in the ductile lower crustal layer. Combined analysis on viscosities inferred from this study and previous studies suggests a weak lower crust with steady-state viscosity of 1018-1019 Pa s beneath the Songpan-Ganzi terrane, which may give rise to the distributed shear deformation and the development of subparallel secondary faults within the terrane. Besides, the inferred afterslip on uppermost patches of the middle fault segment suggests a rate-strengthening frictional behaviour that may be related to the coseismic slip deficit and rupture arrest of the Maduo earthquake.
关键词	Satellite geodesy Numerical modelling Time-series analysis Rheology and friction of fault zones
英文关键词	2011 TOHOKU-OKI; CRUSTAL RHEOLOGY; KUNLUN FAULT; SLIP; GPS; DISPLACEMENTS; DEPTH; INSAR; CYCLE; ZONE
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001159494100015
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283473
作者单位	China University of Geosciences - Wuhan; Leibniz University Hannover; China Earthquake Administration; China Earthquake Networks Center, CEA
推荐引用方式 GB/T 7714	Chen, Fei,Diao, Faqi,Haghighi, Mahmud Haghshenas,et al. Mechanism and implications of the post-seismic deformation following the 2021 Mw 7.4 Maduo (Tibet) earthquake[J],2024,237(1).
APA	Chen, Fei.,Diao, Faqi.,Haghighi, Mahmud Haghshenas.,Wang, Yuebing.,Zhu, Yage.,...&Xiong, Xiong.(2024).Mechanism and implications of the post-seismic deformation following the 2021 Mw 7.4 Maduo (Tibet) earthquake.GEOPHYSICAL JOURNAL INTERNATIONAL,237(1).
MLA	Chen, Fei,et al."Mechanism and implications of the post-seismic deformation following the 2021 Mw 7.4 Maduo (Tibet) earthquake".GEOPHYSICAL JOURNAL INTERNATIONAL 237.1(2024).