气候变化领域集成服务门户(CCPortal): Size Polydispersity Tunes Slip Avalanches of Granular Gouge

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DOI	10.1029/2020GL090458
	Size Polydispersity Tunes Slip Avalanches of Granular Gouge
	Ma G.; Zou Y.; Gao K.; Zhao J.; Zhou W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:23
英文摘要	Granular materials have frequently been used as representations of natural fault gouges. Although they can reproduce proper avalanche behaviors, the universality of the scaling exponent of avalanche size remains debatable. As a core issue in both amorphous plasticity and geophysics, avalanche universality may help reconcile the avalanche behaviors of earthquake and granular materials into the same universality class. We examine numerically the signatures of stress avalanches emerging from quasi-static shear of granular materials with different size polydispersity. A persistent serrated plastic flow phenomenon is observed in our models with varying polydispersity. The stress drop is well defined by a truncated power law distribution P(s) ~ s−τexp(−s/smax). The exponent τ and cutoff stress drop smax show a clear dependence on polydispersity, which reflects a tuned criticality. We further calculate the effective temperature from the statistics of energy fluctuations. The effective temperature volatility can be used to explain the tuned critical behaviors of granular gouge. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Drops; Geophysics; Granular materials; Temperature; Amorphous plasticity; Avalanche behavior; Critical behavior; Effective temperature; Energy fluctuation; Power law distribution; Size polydispersity; Universality class; Volcanic rocks; avalanche; earthquake event; experimental study; granular medium; plastic flow; power law distribution; shear strength
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169356
作者单位	State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, China; Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering of Ministry of Education, Wuhan University, Wuhan, China; Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China; Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong
推荐引用方式 GB/T 7714	Ma G.,Zou Y.,Gao K.,et al. Size Polydispersity Tunes Slip Avalanches of Granular Gouge[J],2020,47(23).
APA	Ma G.,Zou Y.,Gao K.,Zhao J.,&Zhou W..(2020).Size Polydispersity Tunes Slip Avalanches of Granular Gouge.Geophysical Research Letters,47(23).
MLA	Ma G.,et al."Size Polydispersity Tunes Slip Avalanches of Granular Gouge".Geophysical Research Letters 47.23(2020).