The number of VLP seismic events (standard values 5-12) is medium, 10.8 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is high, 1.74 bar (standard values <1 bar). The amplitude of puffing is medium, ~36.3 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 are medium: 15 MW (11:54 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, 118 t/d

CO₂ flux based on the C/S of 12.86 mesured at 03:20 UTC on 2026/04/25 is medium, 1217 t/d

Indice di Attività Vulcanica: medium

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

In the last 24h, Stromboli volcano showed MEDIUM degassing activity (puffing/spattering values of about 36.3 mbar) located mainly in the SW sector, associated with HIGH explosive activity (max. acoustic pressure 1.74 bar), located mainly in the NE sector. The volcanic tremor has MEDIUM values. The number of VLP events is MEDIUM (10.8 events/hour). MODIS and VIIRS satellite images show MEDIUM thermal anomalies (15 MW). SO2 flux is MEDIUM (118 t/d). The CO2 flux is MEDIUM (daily mean flux of 1217 t/d based on a C/S ratio of 12.86 measured 25/04/2026 at 03:20 UTC). The number of rockfalls is MEDIUM, with 6 events detected in the past 24h. The volcanic activity index is MEDIUM.