Non-Poisson distribution of the time distances between two consecutive clusters of earthquakes

With the help of the Diffusion Entropy technique we show the non-Poisson statistics of the distances between consecutive Omori’s swarms of earthquakes. We give an analytical proof of the numerical results of an earlier paper [cond-mat/0212529, Mega et al., Phys. Rev. Lett. 90 (2003) 188501]