(Color online) (a) Simulation result for the probability density of having an earthquake of energy E as a function of E for a dissipation parameter β with N = 35² and with periodic boundary conditions. Different curves correspond to β = 0.40, 0.60, 0.80, 0.90, 0.95, and 0.98, from left to right. The fitted curve is shown as red solid line. (b) Distribution of earthquake size for the different system size with β = 0.95. Different curves correspond to N=15², 25², 35², 50², and 100².