气候变化领域集成服务门户(CCPortal): Microphysical Modeling of Carbonate Fault Friction at Slip Rates Spanning the Full Seismic Cycle

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DOI	10.1029/2020JB021024
	Microphysical Modeling of Carbonate Fault Friction at Slip Rates Spanning the Full Seismic Cycle
	Chen J.; Niemeijer A.R.; Spiers C.J.
发表日期	2021
ISSN	21699313
卷号	126 期号:3
英文摘要	Laboratory studies suggest that seismogenic rupture on faults in carbonate terrains can be explained by a transition from high friction, at low sliding velocities (V), to low friction due to rapid dynamic weakening as seismic slip velocities are approached. However, consensus on the controlling physical processes is lacking. We previously proposed a microphysically based model (the “Chen–Niemeijer–Spiers” [CNS] model) that accounts for the (rate-and-state) frictional behavior of carbonate fault gouges seen at low velocities characteristic of rupture nucleation. In the present study, we extend the CNS model to high velocities (1 mm/s ≤ V ≤ 10 m/s) by introducing multiple grain-scale deformation mechanisms activated by frictional heating. As velocity and hence temperature increase, the model predicts a continuous transition in dominant deformation mechanisms, from frictional granular flow with partial accommodation by plasticity at low velocities and temperatures, to grain boundary sliding with increasing accommodation by solid-state diffusion at high velocities and temperatures. Assuming that slip occurs in a localized shear band, within which grain size decreases with increasing velocity, the model results capture the main mechanical trends seen in high-velocity friction experiments on room-dry calcite-rich rocks, including steady-state and transient aspects, with reasonable quantitative agreement and without the need to invoke thermal decomposition or fluid pressurization effects. The extended CNS model covers the full spectrum of slip velocities from earthquake nucleation to seismic slip rates. Since it is based on realistic fault structure, measurable microstructural state variables, and established deformation mechanisms, it may offer an improved basis for extrapolating lab-derived friction data to natural fault conditions. © 2021. The Authors.
英文关键词	dynamic fault weakening; earthquake/rupture modeling; frictional heating; high-velocity friction; seismic cycle; superplastic flow
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187282
作者单位	State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing, China; HPT Laboratory, Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Now at Geoscience & Engineering Department, Delft University of Technology, Delft, Netherlands
推荐引用方式 GB/T 7714	Chen J.,Niemeijer A.R.,Spiers C.J.. Microphysical Modeling of Carbonate Fault Friction at Slip Rates Spanning the Full Seismic Cycle[J],2021,126(3).
APA	Chen J.,Niemeijer A.R.,&Spiers C.J..(2021).Microphysical Modeling of Carbonate Fault Friction at Slip Rates Spanning the Full Seismic Cycle.Journal of Geophysical Research: Solid Earth,126(3).
MLA	Chen J.,et al."Microphysical Modeling of Carbonate Fault Friction at Slip Rates Spanning the Full Seismic Cycle".Journal of Geophysical Research: Solid Earth 126.3(2021).