The number of VLP seismic events (standard values 5-12) is medium, 9.1 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.73 bar (standard values <1 bar). The amplitude of puffing is medium, ~53.6 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: no thermal anomalies.

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

SO₂ flux in the NE sector of the crater terrace is medium, 70 t/d

CO₂ flux based on the C/S of 10.26 mesured at 19:20 UTC on 2025/06/17 is medium, 517 t/d

Indice di Attività Vulcanica: medium

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

The volcanic activity is generally characterized by strombolian explosions located at the NE crater sector and degassing (puffing/spattering) located at NE and SW crater sectors. In the last 24h, the Stromboli volcano showed a HIGH degassing activity (puffing/spattering with values of about 54mbar). The explosive activity is MEDIUM (max acoustic pressure 0.7 bar). The volcanic tremor shows MEDIUM values. The number of VLP events shows MEDIUM values (9.1 events/hour). MODIS/VIIRS thermal data shows no thermal anomalies. SO2 flux shows LOW values (last: 70 t/d recorded on the 18/06/2025), CO2 flux shows MEDIUM values (last: 517 t/d based on C/S value of 10.26 recorded on the 17/06/2025). The rockfall activity is LOW (n.4 events detected with LOW pseudo-volumes associated). The volcanic activity index is MEDIUM.