Shear heating-induced thermal pressurization during earthquake nucleation
نویسندگان
چکیده
منابع مشابه
Does Shear Heating of Pore Fluid Contribute to Earthquake Nucleation?
[1] Earthquake nucleation requires reduction of frictional strength = ( p) with slip or slip rate, where , n, and p are the friction coefficient, normal stress, and fluid pressure, respectively. For rate state at fixed ( p), instabilities can occur when d ss/dv < 0, where ss is the steady state friction and v is slip rate. Shear heating increases p and, if dilatancy and pore pressure diffusion ...
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[1] For a wide range of conditions, earthquake nucleation zones on rateand statedependent faults that obey either of the popular state evolution laws expand as they accelerate. Under the ‘‘slip’’ evolution law, which experiments show to be the more relevant law for nucleation, this expansion takes the form of a unidirectional slip pulse. In numerical simulations these pulses often tend to appro...
متن کاملRubin and Ampuero: Slip Pulses during Earthquake Nucleation
For a wide range of conditions, earthquake nucleation zones 6 on rate-and state-dependent faults that obey either of the popular state evo-7 lution laws expand as they accelerate. Under the " slip " evolution law, which 8 experiments show to be the more relevant law for nucleation, this expansion 9 takes the form of a unidirectional slip pulse. In numerical simulations these 10 pulses often ten...
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The standard model of injection-induced seismicity considers changes in Coulomb strength due solely to changes in pore pressure. We consider two additional effects: full poroelastic coupling of stress and pore pressure, and time-dependent earthquake nucleation. We model stress and pore pressure due to specified injection rate in a homogeneous, poroelastic medium. Stress and pore pressure are us...
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...
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ژورنال
عنوان ژورنال: Journal of Geophysical Research
سال: 2011
ISSN: 0148-0227
DOI: 10.1029/2010jb008035