The number of VLP seismic events (standard values 5-12) is high, 15 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 0.9 bar (standard values <1 bar). The amplitude of puffing is high, ~80 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, 580. The amplitude of thermal transients is low, 10 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 15 m/s.

MODIS thermal anomalies are low: 2 MW (02:30 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 5 per day.

SO₂ flux in the NE sector of the crater terrace is low, 66 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: medium

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

The volcanic activity of Stromboli volcano showed HIGH degassing activity (puffing/spattering values of about 80 mbar) located mainly in the NE sector, associated with MEDIUM explosive activity (max. acoustic pressure 0.9 bar), located in the NE sector. The volcanic tremor show MEDIUM values. The number of VLP events is HIGH (15.0 events/hour). Thermal anomalies detected by MODIS and VIIRS satellite images are LOW (2 MW). SO2 flux is LOW (66 t/d). CO2 flux is not available. The number of rockfalls is LOW, with 5 events detected in the last 24h. The volcanic activity index is MEDIUM.