The number of VLP seismic events (standard values 5-12) is medium, 10.4 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, ~100 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 low, 30. The amplitude of thermal transients is low, 10 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 10 m/s.

MODIS thermal anomalies: no thermal anomalies.

Rockfall activity is low. The number of rockfalls is 3 per day.

SO₂ flux in the NE sector of the crater terrace is low, 69 t/d

CO₂ flux based on the C/S of 11.04 mesured at 15:20 UTC on 2024/12/20 is medium, 1082 t/d

Indice di Attività Vulcanica: high

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

In the last 24h, the Stromboli volcano showed a VERY HIGH degassing activity (puffing/spattering with values of about 100 mbar). The explosive activity is MEDIUM (max acoustic pressure 1.3 bar). The volcanic tremor shows HIGH values. The number of VLP events is MEDIUM (10.4 events/hour). MODIS/VIIRS thermal data shows no thermal anomalies. SO2 flux has LOW values while CO2 flux is MEDIUM. The rockfall activity is LOW (3 events detected with LOW pseudo-volumes associated). The volcanic activity index is HIGH.