气候变化领域集成服务门户(CCPortal): The Effect of Depth-Dependent Stress in Controlling Free-Surface-Induced Supershear Rupture on Strike-Slip Faults

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DOI	10.1029/2020JB021459
	The Effect of Depth-Dependent Stress in Controlling Free-Surface-Induced Supershear Rupture on Strike-Slip Faults
	Hu F.; Oglesby D.D.; Chen X.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Supershear rupture is crucial in determining ground motion characteristics and its various transition mechanisms is in key connection with rupture dynamics, geometrical complexities and stress heterogeneities. Using 3D dynamic rupture models with numerous depth-dependent stress regimes, we show that depth-dependent stress plays a major role in controlling the occurrence of free-surface-induced (FSI) supershear ruptures. The effect of stress gradient, initial normal stress at the free surface, fault width and critical depth of depth-dependent stress regime are examined. The 2D tangent rupture velocity distributions show that generation of a sustained FSI supershear rupture prefers a larger stress gradient and initial normal stress at the free surface. The truncation of fault width could transit the rupture to a sub-Rayleigh rupture. We propose a dimensionless stress parameter representing a measure of the overall level of depth-dependence in the initial normal stress, and a larger moment magnitude is more likely to trigger a sustained FSI supershear rupture. By comparing the near-field ground motions, three distinct ground motion characteristics are presented using the sustainability of Mach fronts and displacement polarization. This work helps to understand the occurrence of FSI supershear ruptures and its relationship with underground depth-dependent stresses. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	depth-dependent stress; dynamic rupture; free-surface-induced supershear; rupture velocity
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187111
作者单位	School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; University of California, Riverside, CA, United States; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China
推荐引用方式 GB/T 7714	Hu F.,Oglesby D.D.,Chen X.. The Effect of Depth-Dependent Stress in Controlling Free-Surface-Induced Supershear Rupture on Strike-Slip Faults[J],2021,126(5).
APA	Hu F.,Oglesby D.D.,&Chen X..(2021).The Effect of Depth-Dependent Stress in Controlling Free-Surface-Induced Supershear Rupture on Strike-Slip Faults.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Hu F.,et al."The Effect of Depth-Dependent Stress in Controlling Free-Surface-Induced Supershear Rupture on Strike-Slip Faults".Journal of Geophysical Research: Solid Earth 126.5(2021).