DOI: 10.1002/2015GL065829
论文题名: Velocity- and slip-dependent weakening in simulated fault gouge: Implications for multimode fault slip
作者: Ito Y. ; Ikari M.J.
刊名: Geophysical Research Letters
ISSN: 0094-8495
EISSN: 1944-8226
出版年: 2015
卷: 42, 期: 21 起始页码: 9247
结束页码: 9254
语种: 英语
英文关键词: frictional experiment
; rate- and state-dependent friction laws
; slip weakening
; slow slip
Scopus关键词: Earthquakes
; Faulting
; Friction
; Geophysics
; Tribology
; Velocity
; Friction experiments
; Sliding velocities
; Slip weakening
; slow slip
; State-dependent
; Velocity dependence
; Velocity perturbation
; Velocity-weakening
; Fault slips
; coseismic process
; displacement
; earthquake rupture
; fault gouge
; fault slip
; fault zone
; friction
; instability
; laboratory method
; perturbation
; slip
; velocity profile
; wave propagation
英文摘要: In addition to the velocity dependence of friction, slip dependence may play a major role before and during earthquake slip in fault zones. We performed laboratory friction experiments on simulated fault gouges, measuring both the velocity and slip dependence of friction in velocity step tests. The pure velocity-dependent component of friction measured over short displacements shows both velocity strengthening and velocity weakening friction, depending on the amount of slip considered. However, we observe that increases in sliding velocity can induce slip weakening behavior which overwhelms the velocity dependence resulting in large overall weakening, especially at rates > 1 μm/s. On natural tectonic faults, this suggests that a velocity perturbation, such as coseismic rupture propagating onto a fault patch, could induce instability via large slip weakening. Therefore, a fault which is experiencing a transient slip or slow earthquakes may be more easily induced to slip coseismically if a dynamic rupture from large earthquake propagates onto the fault. © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84954510387&doi=10.1002%2f2015GL065829&partnerID=40&md5=d133d03df60376d4efef3037e7751d3c
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8111
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Research Center for Earthquake Prediction, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan
Recommended Citation:
Ito Y.,Ikari M.J.. Velocity- and slip-dependent weakening in simulated fault gouge: Implications for multimode fault slip[J]. Geophysical Research Letters,2015-01-01,42(21).