Volcano-tectonic seismic events (VT) are quite rare at Stromboli, numbering about ten events per year and generally with low magnitude. Using a dataset of 98 events from the 2005–2024 period, we report an improved relocation of VT events here. Relocated earthquakes are mainly distributed on the island and in an area located SSW of Stromboli. These VT events are related to the activation of seismogenic structures by a stress increase related to magma ascent. The shallowest seismicity (4–5 km) is positioned under the Stromboli summit, with a high occurrence in 2006–2007 and in 2019–2024, suggesting a major recharge of the HP magma reservoir. The deepest VT seismicity affects a depth of 7–12 km located in the submerged edifice SSW of the summit and is attributable to the dynamics of the LP magma reservoir, which was more active in 2006–2014 and much less so in the successive years. The increase in the occurrence rate of VT shallow seismicity seems to precede the most significant Stromboli activities, such as the 2007 and 2024 lava effusions followed by paroxysms. For these episodes, VT seismicity would appear to indicate a recharging in the first 4–5 km during the months preceding them, thereby representing a medium–short-term warning signal.
Gambino et al. (Thu,) studied this question.