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

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is low, 0.7 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 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: 1.4 MW (11:54 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 17 per day.

SO₂ flux in the NE sector of the crater terrace is low, 55 t/d

CO₂ flux based on the C/S of 14.3 mesured at 19:20 UTC on 2024/12/04 is medium, 1168 t/d

Indice di Attività Vulcanica: high

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

The volcanic activity is primarily characterized by Strombolian explosions and degassing (puffing/spattering) occurring at the NE crater sector. Explosions are associated with MEDIUM pressure values (maximum ~1.1 bar). Over the past 24 hours, Stromboli volcano exhibited VERY HIGH degassing activity (puffing/spattering with pressure values of ~100 mbar). The volcanic tremor shows HIGH values, with fluctuations up to VERY HIGH. The frequency of VLP events is HIGH (12.7 events per hour). SO2 flux is LOW (55 t/d). CO2 flux is MEDIUM (daily mean of 1168 t/d, based on a C/S ratio of 14.3 measured on 04/12/2024 at 19:20 UTC). MODIS and VIIRS satellite images show LOW thermal anomalies (~1.5 MW). However, cloud coverage prevented clear observation of the volcanic phenomena. Rockfall activity is MEDIUM, with 17 events detected in the past 24 hours. The Volcanic Activity Index is HIGH.