气候变化领域集成服务门户(CCPortal): Application of Constitutive Friction Laws to Glacier Seismicity

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DOI	10.1029/2020GL088964
	Application of Constitutive Friction Laws to Glacier Seismicity
	Zoet L.K.; Ikari M.J.; Alley R.B.; Marone C.; Anandakrishnan S.; Carpenter B.M.; Scuderi M.M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:21
英文摘要	While analysis of glacial seismicity continues to be a widely used method for interpreting glacial processes, the underlying mechanics controlling glacial stick-slip seismicity remain speculative. Here, we report on laboratory shear experiments of debris-laden ice slid over a bedrock asperity under carefully controlled conditions. By modifying the elastic loading stiffness, we generated the first laboratory icequakes. Our work represents the first comprehensive lab observations of unstable ice-slip events and replicates several seismological field observations of glacier slip, such as slip velocity, stress drop, and the relationship between stress drop and recurrence interval. We also observe that stick-slips initiate above a critical driving velocity and that stress drop magnitude decreases with further increases in velocity, consistent with friction theory and rock-on-rock friction laboratory experiments. Our results demonstrate that glacier slip behavior can be accurately predicted by the constitutive rate-and-state friction laws that were developed for rock friction. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Drops; Glacial geology; Slip forming; Stick-slip; Controlled conditions; Driving velocity; Field observations; Laboratory experiments; Rate and state friction; Recurrence intervals; Rock frictions; Slip velocity; Laboratories; fluid mechanics; friction; glacial debris; glacier; laboratory method; seismic hazard; sliding; stiffness; stress field
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/169505
作者单位	Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; MARUM Center for Marine Environmental Sciences, and Faculty of Geosciences, University of Bremen, Bremen, Germany; Department of Geosciences, and Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States; School of Geosciences, University of Oklahoma, Norman, OK, United States; La Sapienza, Department of Earth Science, University of Rome, Rome, Italy
推荐引用方式 GB/T 7714	Zoet L.K.,Ikari M.J.,Alley R.B.,et al. Application of Constitutive Friction Laws to Glacier Seismicity[J],2020,47(21).
APA	Zoet L.K..,Ikari M.J..,Alley R.B..,Marone C..,Anandakrishnan S..,...&Scuderi M.M..(2020).Application of Constitutive Friction Laws to Glacier Seismicity.Geophysical Research Letters,47(21).
MLA	Zoet L.K.,et al."Application of Constitutive Friction Laws to Glacier Seismicity".Geophysical Research Letters 47.21(2020).