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

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 1 bar (standard values <1 bar). The amplitude of puffing is medium, ~65 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 low: 12 MW (01:48 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 2 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 81 t/d

CO₂ flux based on the C/S of 11.56 mesured at 17:20 UTC on 2025/09/29 is high, 1399 t/d

Indice di Attività Vulcanica: medium

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

In the last 24h, the degassing (puffing/spattering 65 mbar) and explosive activity (max. acoustic pressure 1.5 bar)recorded an increasing up to HIGH values from 00:00 UTC and 02:00 UTC of today Stromboli, both located at SW crater. Then, the degassing and the infrasonic pressure are decreased on previuosly MEDIUM values. The volcanic tremor, is coherent with the degassing amplitude, has reached HIGH values between 00:00 UTC and 02:00 UTC and then is decreased on MEDIUM values. The number of VLP events is MEDIUM (12 events/hour). MODIS and VIIRS satellite images show LOW thermal anomalies (1 MW). SO2 flux is MEDIUM (81 t/d). The CO2 flux records HIGH values. The rockfall activity is LOW, with 1 event(s) detected in the past 24 hours. The Volcanic Activity Index is MEDIUM.