 Non-extensive statistical mechanics, also known as Q-statistics, is a generalization of the Boltzmann-Gibb's equilibrium statistical mechanics which has been used to describe the statistical properties of non-equilibrium complex systems. It has been applied to numerous phenomena, including real seismicity. In particular, Salis entropy provides a unifying framework for describing the collective properties of earthquakes and faults. Despite this progress, our understanding of the physical processes leading to the initiation of a rupture and its subsequent growth through a fault system remains limited. This paper provides an overview of the non-extensive interpretation of seismicity, along with the contributions of that Salis formalism to the statistical description of seismic events. This article was authored by Leonardo D.G. Sigalati, Alejandro Ramirez Rojas, and Carlos A. Vargas.