Earthquake nucleation on faults with rate-and state-dependent strength
نویسندگان
چکیده
منابع مشابه
Earthquake nucleation on (aging) rate and state faults
[1] We obtain quasi-static, two-dimensional solutions for earthquake nucleation on faults obeying Dieterich’s ‘‘aging’’ version of the rate and state friction equations. Two distinct nucleation regimes are found, separated by roughly a/b 0.5, where a and b are the constitutive parameters relating changes in slip rate V and state q to frictional strength. When fault healing is unimportant (Vq/Dc...
متن کاملEarthquake nucleation on rate and state faults – Aging and slip laws
[1] We compare 2-D, quasi-static earthquake nucleation on rate-and-state faults under both ‘‘aging’’ and ‘‘slip’’ versions of the state evolution law. For both versions mature nucleation zones exhibit 2 primary regimes of growth: Well above and slightly above steady state, corresponding respectively to larger and smaller fault weakening rates. Well above steady state, aging-law nucleation takes...
متن کاملSelf-similar slip pulses during rate-and-state earthquake nucleation
[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 کاملVariability of earthquake nucleation in continuum models of rate-and-state faults and implications for aftershock rates
[1] Using two continuum models of rate-and-state faults, one with a weaker patch and the other with rheological transition from steady state velocity-weakening to velocity-strengthening friction, we simulate several scenarios of spontaneous earthquake nucleation plausible for natural faults, investigate their response to static shear stress steps, and infer the corresponding aftershock rates. O...
متن کاملEarthquake Ruptures on Rough Faults
Natural fault surfaces exhibit roughness at all scales, with root-mean-square height fluctuations of order 10−3 to 10−2 times the profile length. We study earthquake rupture propagation on such faults, using strongly rate-weakening fault friction and offfault plasticity. Inelastic deformation bounds stresses to reasonable values and prevents fault opening. Stress perturbations induced by slip o...
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ژورنال
عنوان ژورنال: Tectonophysics
سال: 1992
ISSN: 0040-1951
DOI: 10.1016/0040-1951(92)90055-b