The number of VLP seismic events (standard values 5-12) is high, 18.2 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is very high, 3.08 bar (standard values <1 bar). The amplitude of puffing is medium, ~50 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, 579. The amplitude of thermal transients is low, 10 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is medium, 20 m/s.

MODIS thermal anomalies are medium: 20 MW (01:10 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 6 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 95 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 VERY HIGH
• Thermal activity MEDIUM
• SO₂ flux MEDIUM
• CO₂ flux not available
• Rockfall activity MEDIUM

The volcanic activity is generally characterized by intense strombolian explosions and puffing located at NE crater sector. In the last 24h, the Stromboli volcano showed an HIGH degassing activity (puffing 50 mbar), associated to spattering activity located at NE crater. The pressure of the explosions is between HIGH and VERY HIGH (max acoustic pressure 3.08 bar). The number of thermal transients is HIGH, with LOW thermal amplitudes and MEDIUM pyroclast exit velocities. The volcanic tremor shows HIGH values, with peaks to VERY HIGH values in the night between 21/06 and 22/06 (18h-01h UTC). The number of VLP events shows HIGH values (18.2 events/hour). MODIS/VIIRS images showed MEDIUM thermal anomalies (max 20 MW), measured the 22/06 at 01:10 UTC. The SO2 flux measured at the NE crater sector is MEDIUM (95 t/d). CO2 flux values are not available. The rockfall activity is MEDIUM, with 6 events detected in the last 24h with MEDIUM pseudovolumes associated.The volcanic activity index is HIGH.