Magnitude–time distribution of all the models. Columns from left to right are homogeneous, heterogeneous and brittle–ductile stress models respectively; rows from top to bottom are models with state coefficients of 0.004, 0.003, 0.002 and 0.0015, respectively. Except for the heterogeneous stress model with state coefficient of 0.0015, and the length of synthetic catalogues is about 110 000 yr. To avoid the instability at the beginning of the stressing system, the first 50 000 yr of the synthetic catalogues are skipped.