Spatio-temporal seismicity patterns using mutual information application to southern Iberian peninsula (Spain) earthquakes
A quantitative method to characterize the spatio-temporal evolution of the seismic activity of a region for a given time interval is proposed in this paper. The epicentral region is divided in equal area parallelograms that we call "cells". A probability P i is assign to every cell depending on its seismic activity level. The evolution of the mutual information, based on these probabilities, allows us to fit the optimal value for P i's. The analysis results show that is possible to monitor the change of seismic activity quantitatively. We show that a propagation model based on cross template model (CT model) give us a criteria whether or not an area (whose size β is determined by the model mathematically) is going to be considered seismically activated in a period of time τ (whose value is also the result of the application of the method). Our method is applied to the data of Southern Iberian Peninsula seismicity including more than 10,000 earthquakes: data available from the Andalusian Seismic Network is used from 1985 to 1995.