气候变化领域集成服务门户(CCPortal): The effects of sediments on supershear rupture

CCPortal

DOI	10.1016/j.tecto.2021.228777
	The effects of sediments on supershear rupture
	Xu J.; Zhang Z.; Chen X.
发表日期	2021
ISSN	00401951
卷号	805
英文摘要	The effects of sediments on supershear rupture have been discussed. Two sediment models with different media properties have opposite effects on supershear rupture. The rupture accelerates into supershear more easily if the sediment is thin in the model with a relatively low wave velocity. In contrast, the supershear rupture transition occurs more easily if the sediment is thick in the model with a relatively high wave velocity. Supershear is first triggered at the lower boundary of the sediment if the initial stress is sufficiently high. Otherwise, supershear is prevented or triggered at the free surface if the initial stress is relatively low. A deep hypocenter favors supershear rupture. The very long supershear transition distance in some cases may explain the extremely long supershear transition distance in the 2001 Kunlunshan earthquake. We also investigate the effects of the depth-dependent stress on the supershear rupture and find that similar results are concluded. Besides, a daughter crack is triggered but propagates in a subshear regime in some cases. A multi-layered sediment model makes it easier to trigger supershear rupture in relative high-velocity sediment but harder in relatively low-velocity sediment. Our results provide a possible explanation for the rarity of supershear earthquakes in nature. © 2021 The Authors
关键词	Sedimentary effect Supershear rupture
英文关键词	Acoustic wave velocity; Earthquakes; Wave propagation; Depth dependents; Initial stress; Low velocities; Lower boundary; Media properties; Sediment model; Supershear earthquakes; Supershear rupture; Sediments; crack propagation; earthquake hypocenter; earthquake mechanism; earthquake rupture; Kunlun earthquake 2001; sedimentary structure; seismic velocity; shear stress; stress field; tectonic setting; trigger mechanism; wave velocity
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208098
作者单位	Academy for Advanced Interdisciplinary Studies, Southern University of Science and Technology, Shenzhen, 518055, China; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, 518055, China; Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology, Southern University of Science and Technology, Shenzhen, 518055, China; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, 511458, China
推荐引用方式 GB/T 7714	Xu J.,Zhang Z.,Chen X.. The effects of sediments on supershear rupture[J],2021,805.
APA	Xu J.,Zhang Z.,&Chen X..(2021).The effects of sediments on supershear rupture.Tectonophysics,805.
MLA	Xu J.,et al."The effects of sediments on supershear rupture".Tectonophysics 805(2021).