Self-sustained oscillator as a model for explosion quakes at Stromboli Volcano

We analyze seismic signals produced by explosion-quakes at Stromboli Volcano. We use standard nonlinear procedures to search a low-order effective dynamics. The dimension of the reconstructed phase space depends on the number of samples. Namely larger time lengths correspond 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 dimension equal to two. We reproduce this part of the signal with a simple single self-sustained oscillator.