The number of VLP seismic events (standard values 5-12) is high, 16 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 0.98 bar (standard values <1 bar). The amplitude of puffing is medium, ~40.1 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is medium. The number of thermal transients in the NE sector of the crater (standard = 100) is high, 344. The amplitude of thermal transients is low, 5.9 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is medium, 20 m/s.

MODIS thermal anomalies are low: 6 MW (03:00 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 7 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 97 t/d

CO₂ flux based on the C/S of 9.31 mesured at 11:20 UTC on 2026/06/13 is medium, 915 t/d

Indice di Attività Vulcanica: medium

• Seismic (VLP) rate HIGH
• Seismic tremor MEDIUM
• Puffing MEDIUM
• Acustic pression of explosions MEDIUM
• Thermal activity MEDIUM
• SO₂ flux MEDIUM
• CO₂ flux MEDIUM
• Rockfall activity MEDIUM

The volcanic activity of Stromboli volcano showed MEDIUM degassing activity (puffing/spattering values of about 40.1 mbar) located mainly in the NE sector, associated with MEDIUM explosive activity (max. acoustic pressure 0.98 bar), located mainly in the NE sector. The volcanic tremor has MEDIUM values. The number of VLP events is HIGH (16.0 events/hour). MODIS and VIIRS satellite images show LOW thermal anomalies (6 MW). SO2 flux is MEDIUM (97 t/d). The CO2 flux is MEDIUM (daily mean flux of 915 t/d based on a C/S ratio of 9.31 measured 13/06/2026 at 11:20 UTC).  The number of rockfalls is MEDIUM, with 7 events detected in the past 24h. The volcanic activity index is MEDIUM.