Investigating the fractal properties of geological fault systems: The MainEthiopian Rift case

In this article we address the problem of distinguishing between two differ ent geodynamical histories using a geometrical description of the fault sys tem in the Ethiopian Rift. The regional distribution of structures has been characterized by the estimation of the generalized fractal dimensions for the whole system as well as for the subsets of faults oriented along two di fferent directions, using the importance sampling approach. Results show th at the two subsets are monofractal with different dimensions, providing an independent indication that different dynamical processes have been respons ible for the fault generation of this area.