气候变化领域集成服务门户(CCPortal): Slip-rate-dependent friction as a universal mechanism for slow slip events

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DOI	10.1038/s41561-020-0627-9
	Slip-rate-dependent friction as a universal mechanism for slow slip events
	Im K.; Saffer D.; Marone C.; Avouac J.-P.
发表日期	2020
ISSN	17520894
起始页码	705
结束页码	710
卷号	13 期号:10
英文摘要	A growing body of observations worldwide has documented fault slip transients that radiate little or no seismic energy. The mechanisms that govern these slow slip events (SSEs) and their wide range of depths, slip rates, durations, stress drops and recurrence intervals remain poorly known. Here we show that slow slip can be explained by a transition from rate-weakening frictional sliding at low slip rates towards rate-neutral or rate-strengthening behaviour at higher slip rates, as has been observed experimentally. We use numerical simulations to illustrate that this rate-dependent transition quantitatively explains the experimental data for natural fault rocks representative of materials in the source regions of SSEs. With a standard constant-parameter rate-and-state friction law, SSEs arise only near the threshold for slip instability. The inclusion of velocity-dependent friction parameters substantially broadens the range of conditions for slow slip occurrence, and produces a wide range of event characteristics, which include stress drop, duration and recurrence, as observed in nature. Upscaled numerical simulations that incorporate parameters consistent with laboratory measurements can reproduce geodetic observations of repeating SSEs on tectonic faults. We conclude that slip-rate-dependent friction explains the ubiquitous occurrence of SSEs in a broad range of geological environments. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	fault slip; friction; geodetic network; sliding; strike-slip fault; threshold
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/206794
作者单位	Geology and Planetary Science Division, California Institute of Technology, Pasadena, CA, United States; Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, The Pennsylvania State University, University Park, PA, United States; Department of Geosciences, EMS Energy Institute, and G3 Center, The Pennsylvania State University, University Park, PA, United States; University of Texas Institute for Geophysics and Dept. of Geological Sciences, University of Texas, Austin, TX, United States
推荐引用方式 GB/T 7714	Im K.,Saffer D.,Marone C.,et al. Slip-rate-dependent friction as a universal mechanism for slow slip events[J],2020,13(10).
APA	Im K.,Saffer D.,Marone C.,&Avouac J.-P..(2020).Slip-rate-dependent friction as a universal mechanism for slow slip events.Nature Geoscience,13(10).
MLA	Im K.,et al."Slip-rate-dependent friction as a universal mechanism for slow slip events".Nature Geoscience 13.10(2020).