In physics, in the area of dynamical systems, the Olami–Feder–Christensen (OFC) model is an earthquake model conjectured to be an example of self-organized criticality where local exchange dynamics are not conservative.
The model is named after Zeev Olami, Hans Jacob S. Feder, and Kim Christensen who proposed it in 1992.
These rules allow us to define a time variable that is update during the driving step this is equivalent to define a constant drive and assume the relaxation step is instantaneous, which is a good approximation for an earthquake model.
The system's behaviour is heavily influenced by the α parameter.
For low α, there are less possibilities of chain reactions which could lead to cut-offs in the earthquake size distribution, implying the model is not critical.