THE CHAOTICITY DEGREE OF THE CAMPI-FLEGREI SEISMICITY, SOUTHERN ITALY

In the present paper we use the general technique of Grassberger & Pro caccia (1983) which allows us to reconstruct the phase space of the se ismicity at Campi Flegrei from its time series and quantify the degree of chaoticity of such seismicity. We find that the seismic energy rel eased in the Campi Flegrei area as a function of time does not exhibit a chaotic behaviour. On the contrary we determine that this phenomeno n is quasi-periodic with fundamental periods of about 1.3 and 0.3 week s.