The number of VLP seismic events (standard values 5-12) is medium, 9 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.25 bar (standard values <1 bar). The amplitude of puffing is low, ~12 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 medium: 21.83 MW (01:36 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 11 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 76 t/d

CO₂ flux based on the C/S of 14.42 mesured at 13:20 UTC on 2025/05/29 is medium, 627 t/d

Indice di Attività Vulcanica: medium

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

In the last 24h, Stromboli volcano showed MEDIUM degassing activity (puffing/spattering with values of about 12 mbar), associated with a MEDIUM explosive activity (max. acoustic pressure 0.53 bar) located at NE and SW sectors. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (9.0 events/hour). MODIS and VIIRS satellite images show MEDIUM thermal anomalies (22 MW). SO2 flux is MEDIUM (76 t/d). The CO2 flux is MEDIUM (daily mean flux of 627 t/d based on a C/S ratio of 14.42 measured 29/05/2025 at 13:20 UTC). The rockfall activity is MEDIUM, with 11 events detected in the past 24 hours. The Volcanic Activity Index is MEDIUM.