Diverse rupture processes of the 2014 Kangding, China, earthquake doublet (M-W 6.0 and 5.7) and driving mechanisms of aftershocks

doi:10.1016/j.tecto.2021.229118

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	Diverse rupture processes of the 2014 Kangding, China, earthquake doublet (M-W 6.0 and 5.7) and driving mechanisms of aftershocks
	Zhang, Xu; Feng, Wanpeng; Li, Dahu; Yin, Fengling; Yi, Lei
FirstAuthor	Zhang, Xu
	2021-12-05
Source Publication	TECTONOPHYSICS
ISSN	0040-1951
Volume	820
Abstract	An unusual earthquake doublet ruptured the high-risk middle segment of the Xianshuihe fault in November 2014, exhibiting significant variations in the rupture and aftershock characteristics. By conducting rupture kinematic inversions jointly with local broadband seismic data, strong-motion data, and coseismic InSAR data, we find diverse rupture processes of this earthquake doublet. The first event ruptured upward along the dip and bilaterally along the strike with the duration of 8.0 s, whereas the second event ruptured mainly around the hypocenter with the duration of 3.5 s. The estimated moment magnitudes of the first and second events of this earthquake doublet were M-W 6.0 and M-W 5.7, respectively. The further analysis of rupture model-based static and dynamic stress change suggests that the first event is likely responsible for triggering the second event. Based on the comprehensive analysis of aftershock migration features, we find complex and diverse driving mechanisms of aftershocks. Aftershocks of the first event of the earthquake doublet were likely driven by afterslip. Early aftershocks of the second event were also likely driven by afterslip; however, later aftershocks were likely driven by fluid diffusion. The revealed diverse rupture characteristics of the 2014 Kanding earthquake doublet sequence suggest the inherent strength and/or stress heterogeneities on the seismogenic faults.
DOI	10.1016/j.tecto.2021.229118
Citation statistics
Document Type	期刊论文
Identifier	http://ir.isl.ac.cn/handle/363002/34261
Collection	盐湖地质与环境实验室
Recommended Citation GB/T 7714	Zhang, Xu,Feng, Wanpeng,Li, Dahu,et al. Diverse rupture processes of the 2014 Kangding, China, earthquake doublet (M-W 6.0 and 5.7) and driving mechanisms of aftershocks[J]. TECTONOPHYSICS,2021,820.
APA	Zhang, Xu,Feng, Wanpeng,Li, Dahu,Yin, Fengling,&Yi, Lei.(2021).Diverse rupture processes of the 2014 Kangding, China, earthquake doublet (M-W 6.0 and 5.7) and driving mechanisms of aftershocks.TECTONOPHYSICS,820.
MLA	Zhang, Xu,et al."Diverse rupture processes of the 2014 Kangding, China, earthquake doublet (M-W 6.0 and 5.7) and driving mechanisms of aftershocks".TECTONOPHYSICS 820(2021).

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