The number of VLP seismic events (standard values 5-12) is high, 12.9 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is high. The acoustic pressure of explosions is low, 0.73 bar (standard values <1 bar). The amplitude of puffing is medium, ~91 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 medium: 10 MW (20:15 UTC yesterday).

Rockfall activity is very high. The number of rockfalls is 38 per day.

SO₂ flux in the NE sector of the crater terrace is low, 59 t/d

CO₂ flux based on the C/S of 30.59 mesured at 07:20 UTC on 2024/12/19 is high, 1880 t/d

Indice di Attività Vulcanica: high

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

The volcanic activity is generally characterized by strombolian explosions and degassing (puffing/spattering) both located at the NE crater sector. Spattering is characterized by HIGH to 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 HIGH degassing activity (puffing/spattering with values of about 91 mbar). The explosive activity is MEDIUM (max acoustic pressure 0.73 bar). The volcanic tremor shows HIGH to MEDIUM values. The number of VLP events shows HIGH values (12.9 events/hour). MODIS/VIIRS thermal data shows MODERATE thermal anomalies (max 10 MW). SO2 flux shows LOW values (last: 59 t/d recorded on the 19/12/2024), CO2 flux shows HIGH values (last: 1880 t/d based on C/S value of 30.59 recorded on the 19/12/2024). The rockfall activity is VERY HIGH (n.38 events detected with LOW to MEDIUM pseudo-volumes associated). The volcanic activity index is HIGH.