The number of VLP seismic events (standard values 5-12) is high, 15.9 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 0.7 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 not available. The number of thermal transients in the NE sector of the crater(standard = 100) is not available. The amplitude of thermal transients is not available. Exit velocity of pyroclasts, estimated through thermal camera analysis, is not available.

MODIS thermal anomalies are high: 277 MW (03:40 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 4 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 157 t/d

CO₂ flux based on the C/S of 8.36 mesured at 09:29 UTC on 2026/05/28 is medium, 622 t/d

Indice di Attività Vulcanica: high

• Seismic (VLP) rate HIGH
• Seismic tremor HIGH
• Puffing MEDIUM
• Acustic pression of explosions MEDIUM
• Thermal activity NOT AVAILABLE
• SO₂ flux MEDIUM
• CO₂ flux MEDIUM
• Rockfall activity LOW

The volcanic activity is generally characterized by strombolian explosions and degassing (puffing/spattering) located at SW and NE crater sectors. In the last 24h, the Stromboli volcano showed a MEDIUM degassing activity (puffing/spattering with values of about 40 mbar). The explosive activity is MEDIUM (max acoustic pressure 0.7 bar). The volcanic tremor shows HIGH values, with a decreasing trend in the last 24 hours. The number of VLP events shows HIGH values (15.9 events/hour). MODIS/VIIRS thermal data shows HIGH thermal anomalies (277 MW). SO2 flux shows MEDIUM values (last: 157 t/d). The CO2 flux is MEDIUM (last value: 622 t/d with a C/S ratio of 8.36 recorded on 28/05/2026 at 09:29 UTC). The rockfall activity is LOW (4 event detected with LOW pseudo-volumes associated). The volcanic activity index is HIGH.