The number of VLP seismic events (standard values 5-12) is high, 13.5 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is very high, 2 bar (standard values <1 bar). The amplitude of puffing is high, ~53 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, 266. The amplitude of thermal transients is low, 9 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is medium, 21 m/s.

MODIS thermal anomalies: no thermal anomalies.

Rockfall activity is low. The number of rockfalls is 2 per day.

SO₂ flux in the NE sector of the crater terrace is low, 41 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: medium

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

The volcanic activity of Stromboli volcano showed MEDIUM degassing activity (puffing/spattering values of about 53 mbar) located mainly in the NE sector, associated with HIGH to VERY HIGH explosive activity (max. acoustic pressure 2.11 bar), located in the NE sector. The volcanic tremor has HIGH values. The number of VLP events is HIGH (13.5 events/hour). Nothermal anomalies are detected by MODIS and VIIRS satellite images. SO2 flux is LOW (41 t/d). No new CO2 flux data are available. The number of rockfalls is LOW, with 2 events detected in the past 24h. The volcanic activity index is MEDIUM.