Rheological Controls on Asperity Weakening During Earthquake Slip
نویسندگان
چکیده
منابع مشابه
A model for flash weakening by asperity melting during high-speed earthquake slip
[1] Recent results from laboratory experiments on a broad range of mineral systems exhibit dramatic drops in the effective friction coefficient m once the slip rate exceeds a critical level Vw, which is typically O(0.1) m/s. This ‘‘flash weakening’’ has been attributed to the effects of localized heating at highly stressed microscopic asperities. We extend previous phenomenological treatments t...
متن کاملHeating and weakening of faults during earthquake slip
[1] Field observations of mature crustal faults suggest that slip in individual events occurs primarily within a thin shear zone, <1–5 mm, within a finely granulated, ultracataclastic fault core. Relevant weakening processes in large crustal events are therefore suggested to be thermal, and to involve the following: (1) thermal pressurization of pore fluid within and adjacent to the deforming f...
متن کاملStress-Breakdown Time and Slip-Weakening Distance Inferred from Slip-Velocity Functions on Earthquake Faults
We estimate the critical slip-weakening distance on earthquake faults by using a new approach, which is independent of the estimate of fracture energy or radiated seismic energy. The approach is to find a physically based relation between the breakdown time of shear stress Tb, the time of peak slip-velocity Tpv, and the slip-weakening distance Dc, from the time histories of shear stress, slip, ...
متن کاملCan observations of earthquake scaling constrain slip weakening?
S U M M A R Y We use observations of earthquake source parameters over a wide magnitude range (M W ∼ 0–7) to place constraints on constitutive fault weakening. The data suggest a scale dependence of apparent stress and stress drop; both may increase slightly with earthquake size. We show that this scale dependence need not imply any difference in fault zone properties for different sized earthq...
متن کاملFrictional weakening and slip complexity in earthquake faults
Previous work has shown that velocity-weakening friction produces slip complexity in simple dynamical models of earthquake faults ( Carlson and Langer, 1989). Rere I show that a different type of dynamical instability, caused by slipweakening friction, also produces slip complexity. The deterministically chaotic slip complexity produced by slip-weakening friction in a simple one dimensional mod...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research: Solid Earth
سال: 2019
ISSN: 2169-9313,2169-9356
DOI: 10.1029/2019jb018231