The number of VLP seismic events (standard values 5-12) is high, 15.4 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is medium, 0.6 bar (standard values <1 bar). The amplitude of puffing is high, ~87 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is medium. The number of thermal transients in the NE sector of the crater (standard = 100) is high, 842. The amplitude of thermal transients is low, 5 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 15 m/s.

MODIS thermal anomalies are medium: 12 MW (13:50 UTC yesterday).

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

SO₂ flux in the NE sector of the crater terrace is medium, 113 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: high

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

The volcanic activity is generally characterized by strombolian explosions and degassing (puffing/spattering) located mainly at SW crater sectors. In the last 24h, the Stromboli volcano showed a HIGH degassing activity (puffing/spattering with values of about 90 mbar). The explosive activity is MEDIUM (max acoustic pressure 0.6 bar). The volcanic tremor shows HIGH values. The number of VLP events shows HIGH values (15.4 events/hour). MODIS/VIIRS thermal data shows MEDIUM thermal anomalies. SO2 flux shows MEDIUM values (last: 113 t/d), with an increasing trend in the last 24 hours. No new measures of CO2 flux in last 24 hours are available. The rockfall activity is LOW (3 event detected with LOW pseudo-volumes associated). The volcanic activity index is HIGH.