DOI: 10.1002/2016GL067881
论文题名: An empirically based steady state friction law and implications for fault stability
作者: Spagnuolo E. ; Nielsen S. ; Violay M. ; Di Toro G.
刊名: Geophysical Research Letters
ISSN: 0094-9120
EISSN: 1944-8851
出版年: 2016
卷: 43, 期: 7 起始页码: 3263
结束页码: 3271
语种: 英语
英文关键词: earthquake mechanics
; fault stability
; fault stiffness
; friction laws
; slip events
Scopus关键词: Earthquakes
; Faulting
; Friction
; Geophysics
; Seismology
; Stability
; Statistical tests
; Stiffness
; Testing
; Tribology
; Constitutive parameters
; Deformation conditions
; Earthquake mechanics
; Experimental evidence
; Friction laws
; Rate and state friction
; Slip events
; Steady-state condition
; Fault slips
英文摘要: Empirically based rate-and-state friction laws (RSFLs) have been proposed to model the dependence of friction forces with slip and time. The relevance of the RSFL for earthquake mechanics is that few constitutive parameters define critical conditions for fault stability (i.e., critical stiffness and frictional fault behavior). However, the RSFLs were determined from experiments conducted at subseismic slip rates (V < 1 cm/s), and their extrapolation to earthquake deformation conditions (V > 0.1 m/s) remains questionable on the basis of the experimental evidence of (1) large dynamic weakening and (2) activation of particular fault lubrication processes at seismic slip rates. Here we propose a modified RSFL (MFL) based on the review of a large published and unpublished data set of rock friction experiments performed with different testing machines. The MFL, valid at steady state conditions from subseismic to seismic slip rates (0.1 μm/s < V < 3 m/s), describes the initiation of a substantial velocity weakening in the 1-20 cm/s range resulting in a critical stiffness increase that creates a peak of potential instability in that velocity regime. The MFL leads to a new definition of fault frictional stability with implications for slip event styles and relevance for models of seismic rupture nucleation, propagation, and arrest. © 2016. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981765549&doi=10.1002%2f2016GL067881&partnerID=40&md5=b4f9c7bcf6cbc57a4311f2e06ceaefa2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10083
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: Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
Recommended Citation:
Spagnuolo E.,Nielsen S.,Violay M.,et al. An empirically based steady state friction law and implications for fault stability[J]. Geophysical Research Letters,2016-01-01,43(7).