The number of VLP seismic events (standard values 5-12) is high, 17.6 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is medium, 0.7 bar (standard values <1 bar). The amplitude of puffing is medium, ~37.6 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, 939. The amplitude of thermal transients is low, 1.6 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 10 m/s.

MODIS thermal anomalies are low: 4.26 MW (11:18 UTC yesterday).

Rockfall activity is high. The number of rockfalls is 11 per day.

SO₂ flux in the NE sector of the crater terrace is low, 12 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 MEDIUM
• Acustic pression of explosions MEDIUM
• Thermal activity MEDIUM
• SO₂ flux LOW
• CO₂ flux not available
• Rockfall activity HIGH

The volcanic activity of Stromboli volcano showed MEDIUM degassing activity (puffing/spattering values of about 37.6 mbar) located mainly in the NE sector, associated with MEDIUM explosive activity (max. acoustic pressure 0.7 bar), located in the NE sector. The volcanic tremor shows MEDIUM values. The number of VLP events is HIGH (17.6 events/hour). Thermal anomalies detected by MODIS and VIIRS satellite images are LOW (4.26 MW). SO2 flux is LOW (12 t/d). CO2 flux is not available. The number of rockfalls is HIGH, with 11 events detected in the last 24h. The volcanic activity index is MEDIUM.