The number of VLP seismic events (standard values 5-12) is medium, 11.1 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 1.07 bar (standard values <1 bar). The amplitude of puffing is low, ~31 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 7 per day.

SO₂ flux in the NE sector of the crater terrace is low, 65 t/d

CO₂ flux based on the C/S of 4.8 mesured at 19:20 UTC on 2025/08/29 is low, 316 t/d

Indice di Attività Vulcanica: medium

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

In the last 24h, Stromboli volcano showed MEDIUM degassing activity (puffing/spattering with values of about 31 mbar) at the SW and NE sectors. This degassing regime was associated with a MEDIUM explosive activity (max. acoustic pressure 1.07 bar) mainly located at NE sector. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (11.1 events/hour). MODIS and VIIRS satellite images show no thermal anomalies. SO2 flux is LOW (65 t/d). The CO2 flux, estimated with a C/S ratio of 4.8, is LOW (316 t/d). The rockfall activity is LOW, with 7 evens detected in the past 24 hours having LOW seismic energies. The Volcanic Activity Index is MEDIUM.