The number of VLP seismic events (standard values 5-12) is high, 12.2 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 0.62 bar (standard values <1 bar). The amplitude of puffing is medium, ~40 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, 294. The amplitude of thermal transients is low, 5 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 12 m/s.

MODIS thermal anomalies: no thermal anomalies.

Rockfall activity: no rockfalls detected.

SO₂ flux in the NE sector of the crater terrace is low, 47 t/d

CO₂ flux based on the C/S of 3.93 mesured at 19:20 UTC on 2026/05/13 is low, 243 t/d

Indice di Attività Vulcanica: high

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

In the last 24h, Stromboli volcano showed MEDIUM degassing activity (puffing/spattering values of about 40 mbar) located mainly in the SW sector, associated with MEDIUM explosive activity (max. acoustic pressure 0.62 bar), located mainly in the NE sector. The volcanic tremor has HIGH values. The number of VLP events is HIGH (12.2 events/hour). No thermal anomalies are detected by MODIS and VIIRS satellite images. SO2 flux is LOW (47 t/d). The CO2 flux is LOW (243 t/d), with a C/S ratio of 3.93. No rockfalls are detected in the last 24h. The volcanic activity index is HIGH.