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Dynamics of a velocity strengthening fault region: Implications for slow earthquakes and postseismic slip
 

Summary: Dynamics of a velocity strengthening fault region:
Implications for slow earthquakes and postseismic slip
Hugo Perfettini
Institut de Recherche pour le DŽeveloppement/Observatoire Midi-PyrŽenŽees, Toulouse, France.
Jean-Paul Ampuero
Seismological Laboratory, California Institute of Technology, Pasadena, USA.
Abstract. We consider the effect of permanent stress changes on a velocity
strengthening rate-and-state fault, through numerical simulations and ana-
lytical results on 1D, 2D and 3D models. We show that slip transients can be
triggered by perturbations of size roughly larger than Lb = Gdc/b, where G
is the shear modulus, dc and b are respectively the characteristic slip distance
and the coefficient of the evolution effect of rate-and-state friction, and is
the effective normal stress. Perturbations that increase the Coulomb stress
lead to the strongest transients, but creep bursts can also be triggered by
perturbations that decrease the Coulomb stress. In the latter case peak slip
velocity is attained long after the perturbation, so that it may be difficult
in practice to identify their origin. The evolution of slip in a creep transient
shares many features with the nucleation process of a rate-and-state weak-
ening fault: slip initially localizes over a region of size not smaller than Lb,
then accelerates transiently and finally expands as a quasi-static propagating

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences