A discrete time evolution model for fracture networks

Abstract

We examine geophysical crack patterns using the mean field theory of convex mosaics. We assign the pair $({\bar{n}}^{\ast },{\bar{v}}^{\ast })$ of average corner degrees to each crack pattern and we define two local, random evolutionary steps $R_0$ and $R_1$, corresponding to secondary fracture and rearrangement of cracks, respectively. Random sequences of these steps result in trajectories on the $({\bar{n}}^{\ast },{\bar{v}}^{\ast })$ plane. We prove the existence of limit points for several types of trajectories. Also, we prove that cell density $\rho ={\bar{v}}^{\ast }/{\bar{n}}^{\ast }$ increases monotonically under any admissible trajectory.

15 pages, 4 figures