An analysis of earthquakes clustering based on a second-order diagnostic approach

A diagnostic method for space\u2013time point process is here introduced and applied to seismic data of a fixed area of Japan. Nonparametric methods are used to estimate the intensity function of a particular space\u2013time point process and on the basis of the proposed diagnostic method, second-order features of data are analyzed: this approach seems to be useful to interpret space\u2013time variations of the observed seismic activity and to focus on its clustering features