Seismic monitoring of active volcanoes is an important tool for detecting fluid migration related to magmatic activity. Since the last eruption in 1944, the features of the seismic activity affecting the Somma-Vesuvius volcano (southern Italy) as well as independent geological and geophysical constraints suggest that magmatic processes are not directly involved in triggering earthquakes (Berrino et al., 1993; Zollo et al., 1996; Bianco et al., 1998). On the other hand, the spatio-temporal evolution of the seismic energy release is inconsistent with simple faulting processes from variations in the regional stress field (e.g., Deichmann and Garcia-Fernandez, 1992, and references therein).

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