Cumulative numbers of earthquakes as a function of time (bold lines, scale on the left). The Z-functions compare mean rates within windows to the long-term rate estimating the significance of rate decreases (thin lines, scale on the right). (a) N=500, T_W=5 yr; (b) N=400, T_W=5 yr; (c) N=300, T_W=3 yr; (d) N=200, T_W=4 yr; (e) N=100, T_W=5 yr; (f) aftershock volume; (g) aftershock volume using the catalogue including clusters T_W=5 yr; (h) example of a data set including clusters N=300, T_W=3 yr; M≥2.2 for all plots. The triangle denotes the time of the main shock.