The number of VLP seismic events (standard values 5-12) is medium, 9.5 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 1 bar (standard values <1 bar). The amplitude of puffing is medium, ~60 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is low. 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: 33 MW (19:50 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 1 per day.

SO₂ flux in the NE sector of the crater terrace is low, 40 t/d

CO₂ flux based on the C/S of 11.04 mesured at 13:20 UTC on 2025/10/09 is medium, 446 t/d

Indice di Attività Vulcanica: medium

• Seismic (VLP) rate MEDIUM
• Seismic tremor HIGH
• Puffing MEDIUM
• Acustic pression of explosions MEDIUM
• Thermal activity LOW
• SO₂ flux LOW
• CO₂ flux MEDIUM
• Rockfall activity LOW

The volcanic activity is generally characterized by strombolian explosions located at the NE and SW crater sectors and a degassing (puffing/spattering) mainly located at SW crater sectors. In the last 24h, the Stromboli volcano showed a HIGH degassing activity (puffing/spattering with values of about 60 mbar). The explosive activity is MEDIUM, with sporadic events reaching HIGH values (up to 1.3 bar). The volcanic tremor shows HIGH values. The number of VLP events shows MEDIUM values (9.5 events/hour). MODIS/VIIRS thermal data shows MEDIUM thermal anomalies (max 33 MW). SO2 flux shows LOW values (last: 40 t/d recorded on the 09/10/2025), CO2 flux shows MEDIUM value (446 t/d), based on C/S ratio of 11.04 recorded at 13:20UTC of yesterday. The rockfall activity is LOW (1 event) with associated LOW pseudo-volume. The volcanic activity index is MEDIUM. (NB the recorded data are conditioned by the adverse weather conditions: strong wind)