Scaling in a cellular automaton model of earthquake faults with long-range stress transfer

We present simulation data indicating that the scaling of earthquake events in models of faults with long-range stress transfer is composed of at least three distinct regions, corresponding to earthquakes with different underlying physical mechanisms. We discuss the interpretation of these events as fluctuations in the vicinity of a spinodal critical point. In addition to the scaling events, there are larger ``breakout'' events that do not scale. The nature of the stress density profile before an event is investigated and a possible way of predicting breakout events is discussed.