globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116133
论文题名:
Experimental and modeling study of the effect of fault roughness on dynamic frictional sliding
作者: Tal Y.; Goebel T.; Avouac J.-P.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 536
语种: 英语
中文关键词: fault friction ; friction experiments ; numerical modeling ; roughness ; slow slip ; stick-slip
英文关键词: Drops ; Numerical models ; Slip forming ; Stick-slip ; Stiffness ; Additional resistances ; Fault friction ; Friction coefficients ; Friction experiments ; Frictional behavior ; Key characteristics ; Rate and state friction ; slow slip ; Surface roughness ; experimental study ; fault propagation ; friction ; loading ; numerical model ; roughness ; sliding ; slip rate ; stick-slip ; stiffness
英文摘要: Friction governs many processes in nature from the motion of glaciers and landslides to tremors and earthquakes. The roughness of the sliding interfaces presumably affects their dynamics, in particular the condition for stable or unstable sliding. We investigate this issue by modeling numerically tri-axial stick-slip experiments on Westerly granite samples with different levels of roughness. The model accounts for surface roughness at the millimeter scale and assumes rate and state friction with enhanced dynamic weakening. It reproduces key characteristics observed in the experiments, such as sequences of fast stick-slip events for smooth surface and sequence of slow slip events with small stress drop followed by a large-stress drop unstable slip event for the rough interface. The increase in loading stiffness due to the additional resistance from roughness can explain the initial slow slip. The fast-unstable event may be the result of the higher critical stiffness due to the increase of local normal tractions with slip, as well as of the reduction of the loading stiffness due to contacts losses. The study allows examining numerically the relationship between the frictional behavior on the interface and the apparent friction estimated from external loads. We find that, because of dynamic overshoot, the reduction in apparent friction is larger than that of the actual friction coefficient on the interface. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165302
Appears in Collections:气候变化与战略

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作者单位: Seismological Laboratory, Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, United States; Department of Geological and Environmental Sciences, Ben-Gurion University of the Negev, Beer Sheva, Israel; Department of Earth Sciences, University of California, Santa Cruz, CA, United States; Center for Earthquake Research and Information, University of Memphis, United States

Recommended Citation:
Tal Y.,Goebel T.,Avouac J.-P.. Experimental and modeling study of the effect of fault roughness on dynamic frictional sliding[J]. Earth and Planetary Science Letters,2020-01-01,536
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