The number of VLP seismic events (standard values 5-12) is medium, 9.2 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is medium, 1.14 bar (standard values <1 bar). The amplitude of puffing is very high, ~203 mbar.

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

Thermal activity of explosive events is not available. The number of thermal transients in the NE sector of the crater(standard = 100) is not available. The amplitude of thermal transients is not available. Exit velocity of pyroclasts, estimated through thermal camera analysis, is not available.

MODIS thermal anomalies: no thermal anomalies.

Rockfall activity is low. The number of rockfalls is 1 per day.

SO₂ flux in the NE sector of the crater terrace is low, 29 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: high

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

The volcanic activity is generally characterized by strombolian explosions and degassing (puffing/spattering) located at the NE crater sector. Explosions are characterized by MEDIUM values of pressure. In the last 24h, the Stromboli volcano showed a VERY HIGH degassing activity (puffing/spattering with values of about 203 mbar). The volcanic tremor shows HIGH values. The number of VLP events is MEDIUM (9.2 events/hour). SO2 flux is LOW (29 t/d). The CO2 flux was not evaluated. MODIS/VIIRS thermal data shows no thermal anomalies. The rockfall activity is LOW. The volcanic activity index is HIGH.