Fig. 2. Numerical model of a damage zone. Numerical modelling of the effects of the increasing thickness of the fault-damage zone with time. Left top, the setting up of the model. Main illustration shows how the damage zone can be modelled as composed of many subzones, each with a different Young’s modulus. The subzones are added in 10 steps. Further results are in Rock Fractures in Geological Processes, Chapter 14.