Nonlinear Processes in Geophysics www.nonlin-processes-geophys.net 1023-5809 1607-7946 9 1 2002 10.5194/npg-9-31-2002 http://www.nonlin-processes-geophys.net/9/31/2002/ http://www.nonlin-processes-geophys.net/9/31/2002/npg-9-31-2002.html http://www.nonlin-processes-geophys.net/9/31/2002/npg-9-31-2002.pdf 31 35 0000-00-00 Self-sustained oscillator as a model for explosion quakes at Stromboli Volcano S. De Martino C. Godano M. Falanga Department of Physics, Salerno University, Via S. Allende, Baronissi (SA) 84084 Italy Dipartimento di Scienze Ambientali, II Universita’ di Napoli, Caserta, Italy INFM unita’ di Salerno, 84081 Baronissi (SA), Italy We analyze seismic signals produced by explosion-quakes at Stromboli Volcano. We use standard nonlinear procedures to search a low-order effective dynam-ics. The dimension of the reconstructed phase space depends on the number of samples. Namely larger time lengths cor-respond to dynamical systems of different complexity. If we restrict the analysis to the signal associated directly to the source (Chouet et al., 1997), we obtain a phase space dimen-sion equal to two. We reproduce this part of the signal with a simple single self-sustained oscillator.