A simulation of dynamic rupture propagation introducing a randomly heterogeneous Δ τ (or τ
) distribution of patches. Some patches around the hypocenter are kept uniform to assure that the initial rupture progresses. (a) Initial shear stress τ0, with the small circles corresponding to the initial rupture area of the foreshock and main shock. (b) Peak strength τp. (c) Residual stress τr. (d) Dc. (e) Snapshots of the dynamic rupture propagation. The hypocenter of the main shock is represented by a cross in the above panels and by a star at the bottom.