The number of VLP seismic events (standard values 5-12) is high, 14.8 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is low, 0.5 bar (standard values <1 bar). The amplitude of puffing is medium, ~60 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, 850. The amplitude of thermal transients is medium, 20 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is medium, 20 m/s.

MODIS thermal anomalies: no thermal anomalies.

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

SO₂ flux in the NE sector of the crater terrace is medium, 118 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 MEDIUM
• Acustic pression of explosions LOW
• Thermal activity MEDIUM
• SO₂ flux MEDIUM
• CO₂ flux not available
• Rockfall activity LOW

The volcanic activity is generally characterized by strombolian explosions located at NE and SW crater sectors, and puffing localized at the NE sector. In the last 24h, the Stromboli volcano showed a HIGH degassing activity (puffing with values of about 70 mbar). The explosive activity is MEDIUM (max acoustic pressure 0.5 bar). The number of explosions (thermal transients) are HIGH, with a MEDIUM thermal amplitude and MEDIUM exit velocity of pyroclasts. The volcanic tremor shows HIGH values. The number of VLP events showed HIGH values (14.8 events/hour). MODIS/VIIRS images showed LOW thermal anomalies (max 1 MW). SO2 flux shows MEDIUM values (117 t/d). The rockfall activity is LOW. The volcanic activity index is HIGH.