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 medium. The acoustic pressure of explosions is medium, 1.37 bar (standard values <1 bar). The amplitude of puffing is low, ~40 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, 1099. The amplitude of thermal transients is low, 1 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 11 m/s.

MODIS thermal anomalies are low: 5 MW (19:50 UTC yesterday).

Rockfall activity: no rockfalls detected.

SO₂ flux in the NE sector of the crater terrace is medium, 117 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 LOW
• Acustic pression of explosions MEDIUM
• Thermal activity MEDIUM
• SO₂ flux MEDIUM
• CO₂ flux not available
• Rockfall activity LOW

The volcanic activity is generally characterized by strombolian explosions and puffing located at NE crater sector. In the last 24h, the Stromboli volcano showed a MEDIUM degassing activity (puffing with values of about 40 mbar). The amplitude pressure of the explosions is MEDIUM (max acoustic pressure 1.4 bar). The number of explosions (thermal transients) are HIGH, with a LOW thermal amplitude and LOW 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 2 MW). SO2 flux in the last 24 hours shows MEDIUM values (117 t/d). The rockfall activity is LOW (zero events). The volcanic activity index is HIGH.