The number of VLP seismic events (standard values 5-12) is high, 12.7 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is high, 1.2 bar (standard values <1 bar). The amplitude of puffing is high, ~71 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, 810. The amplitude of thermal transients is low, 5 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 15 m/s.

MODIS thermal anomalies are low: 4 MW (01:00 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 3 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 74 t/d

CO₂ flux based on the C/S of 3.47 mesured at 07:20 UTC on 2026/05/12 is low, 231 t/d

Indice di Attività Vulcanica: high

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

In the last 24h, Stromboli volcano showed HIGH degassing activity (puffing/spattering values of about 70 mbar) located mainly in the SW sector, associated with MEDIUM to HIGH explosive activity (max. acoustic pressure 1.2 bar), located mainly in the NE sector. The volcanic tremor has HIGH values. The number of VLP events is HIGH (12.7 events/hour). MODIS and VIIRS satellite images show LOW thermal anomalies (4 MW). SO2 flux is MEDIUM (74 t/d). The CO2 flux is LOW (231 t/d), with a C/S ratio of 3.47. The number of rockfalls is LOW, with 3 events detected in the past 24h. The volcanic activity index is HIGH.