ALT a) Maximum slip velocity over multiple cycles on a heterogeneous (black) and homogeneous (gray) fault. The dynamic slip rate threshold is shown for reference. b) Spatio-temporal distribution of slip velocities along the fault for one cycle is highlighted for the model. A range of behavioral patterns were observed including burst seismicity, slow slip events, accelerated creep and mainshock nucleation. Two asperities (A1 and A2) are highlighted as they represented regions that showed higher levels of locking with respect to their surroundings for all models considered (see Supplemental Section S4). The barcode distribution of frictional properties is given for reference. The red stars represent positions on the fault that suddenly breached the dynamic threshold. The lower panel shows the spatio-temporal slip velocity evolution for the homogeneous model.