The number of VLP seismic events (standard values 5-12) is high, 12.8 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is medium, 1.3 bar (standard values <1 bar). The amplitude of puffing is high, ~139 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 1 per day.

SO₂ flux in the NE sector of the crater terrace is not available

CO₂ flux based on the C/S of 16.64 mesured at 21:20 UTC on 2024/10/21 is medium, 928 t/d

Indice di Attività Vulcanica: high

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

The volcanic activity is generally characterized by strombolian explosions and degassing (puffing/spattering) both located at the NE crater sector. Spattering is characterized by VERY HIGH values of pressure and this activity is correlated with seismic tremor characterized by HIGH values. In the last 24h, the Stromboli volcano showed a VERY HIGH degassing activity (puffing/spattering with values of about 139 mbar). The explosive activity is MEDIUM (max acoustic pressure 1.3 bar). The volcanic tremor shows HIGH values. The number of VLP events shows HIGH values (12.8 events/hour). MODIS/VIIRS thermal data shows NO thermal anomalies. SO2 flux shows no new data (last: 292 t/d recorded on the 20/10/2024), CO2 flux shows MEDIUM values (last: 928 t/d based on C/S value of 16.64 recorded on the 21/10/2024). The rockfall activity is LOW (n.1 event detected with LOW pseudo-volumes associated). The volcanic activity index is HIGH. (NB Recorded data is affected by adverse weather conditions: cloud cover)