气候变化领域集成服务门户(CCPortal): Coseismic fault lubrication by viscous deformation

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DOI	10.1038/s41561-021-00747-8
	Coseismic fault lubrication by viscous deformation
	Pozzi G.; De Paola N.; Nielsen S.B.; Holdsworth R.E.; Tesei T.; Thieme M.; Demouchy S.
发表日期	2021
ISSN	17520894
起始页码	437
结束页码	442
卷号	14 期号:6
英文摘要	Despite the hazard posed by earthquakes, we still lack fundamental understanding of the processes that control fault lubrication behind a propagating rupture front and enhance ground acceleration. Laboratory experiments show that fault materials dramatically weaken when sheared at seismic velocities (>0.1 m s−1). Several mechanisms, triggered by shear heating, have been proposed to explain the coseismic weakening of faults, but none of these mechanisms can account for experimental and seismological evidence of weakening. Here we show that, in laboratory experiments, weakening correlates with local temperatures attained during seismic slip in simulated faults for diverse rock-forming minerals. The fault strength evolves according to a simple, material-dependent Arrhenius-type law. Microstructures support this observation by showing the development of a principal slip zone with textures typical of sub-solidus viscous flow. We show evidence that viscous deformation (at either sub- or super-solidus temperatures) is an important, widespread and quantifiable coseismic lubrication process. The operation of these highly effective fault lubrication processes means that more energy is then available for rupture propagation and the radiation of hazardous seismic waves. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	coseismic process; deformation mechanism; microscopy; microstructure; seismic wave; wave propagation
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206951
作者单位	Department of Earth Sciences, Rock Mechanics Laboratory, University of Durham, Durham, United Kingdom; Department of Geosciences, University of Padova, Padova, Italy; Geosciences Montpellier, CNRS and Université de Montpellier, UMR5243, Montpellier, France
推荐引用方式 GB/T 7714	Pozzi G.,De Paola N.,Nielsen S.B.,et al. Coseismic fault lubrication by viscous deformation[J],2021,14(6).
APA	Pozzi G..,De Paola N..,Nielsen S.B..,Holdsworth R.E..,Tesei T..,...&Demouchy S..(2021).Coseismic fault lubrication by viscous deformation.Nature Geoscience,14(6).
MLA	Pozzi G.,et al."Coseismic fault lubrication by viscous deformation".Nature Geoscience 14.6(2021).