Stromboli's Activity Index during the past weeks (image: LGS)A major explosion occurred yesterday morning that at 05:12 GMT / 07:12 local time, the volcano observatory reported. The explosion occurred in the northern crater area. Lava bombs fell mainly on the upper part of the Sciara del Fuoco. Seismic activity at 05:12 UTC recorded a signal with a higher-than-normal amplitude associated with the major explosion, followed by a phase of moderate increase in amplitude in the first 8 minutes.The average amplitude of the signal showed a rapid increase, reaching high values ​​during the explosive event, and a subsequent sudden decrease towards medium values, where it remains. No significant changes have been reported in the rate of occurrence of explosive events. Analysis of data from the high-frequency GNSS network shows no significant ground deformation.The overall activity of the volcano (s. att. image) had been set back to medium on 3 June, after it has been at high level for most of May; this is based on a summary of various monitoring data analyzed by volcanologists of the University of Firenze. At the same time, the seismic activity in the southern Tyrrhenian sea has been elevated during the past weeks. Source: Communicato Stromboli 2026/06/12 08:34 (06:34 UTC) (INGV, pdf)