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The relation between seismic moment and fractured area is crucial toearthquake hazard analysis. Experimental catalogs show multiple scalingbehaviors, with some controversy concerning the exponent value in the largeearthquake regime. Here, we show that the original Olami, Feder, andChristensen model does not capture experimental findings. Taking into accountheterogeneous friction, the visco elastic nature of faults together withfinite-size effects, we are able to reproduce the different scaling regimes offield observations. We provide an explanation for the origin of the twocrossovers between scaling regimes, which are shown to be controlled both bythe geometry and the bulk dynamics.

Scaling laws in earthquake occurrence: Disorder, viscosity, and finite size effects in Olami-Feder-Christensen models