The number of VLP seismic events (standard values 5-12) is high, 12.7 events/hour.

The amplitude of seismic tremor is low.

The infrasonic activity is high. The acoustic pressure of explosions is medium, 1.5 bar (standard values <1 bar). The amplitude of puffing is low, ~30 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: 3 MW (12:24 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, 12 t/d

CO₂ flux based on the C/S of 21.38 mesured at 13:20 UTC on 2024/12/13 is low, 271 t/d

Indice di Attività Vulcanica: high

• Seismic (VLP) rate HIGH
• Seismic tremor LOW
• Puffing LOW
• Acustic pression of explosions MEDIUM
• Thermal activity NOT AVAILABLE
• SO₂ flux LOW
• CO₂ flux LOW
• 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 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 MEDIUM degassing activity (puffing/spattering with values of about 30 mbar). The explosive activity is HIGH (max acoustic pressure 1.5 bar). The volcanic tremor shows HIGH to MEDIUM values. The number of VLP events shows HIGH values (12.7 events/hour). MODIS/VIIRS thermal data shows LOW thermal anomalies (max 3 MW). SO2 flux shows LOW values (last: 12 t/d recorded on the 13/12/2024), CO2 flux shows LOW values (last: 271 t/d based on C/S value of 21:31 recorded on the 13/12/2024). The rockfall activity is LOW (n.1 event detected). The volcanic activity index is HIGH. (NB Recorded data is affected by adverse weather conditions: cloud cover and strong wind)