The number of VLP seismic events (standard values 5-12) is high, 17.1 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is high. The acoustic pressure of explosions is very high, 2.4 bar (standard values <1 bar). The amplitude of puffing is high, ~51.6 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 high: 112 MW (14:10 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 2 per day.

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: medium

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

The volcanic activity is generally characterized by strombolian explosions located at the NE crater sector and degassing (puffing/spattering) located at NE and SW crater sectors. In the last 24h, Stromboli volcano showed HIGH degassing activity (puffing/spattering with values of about 51.6 mbar). The explosive activity is VERY HIGH (max acoustic pressure 2.4 bar). The volcanic tremor shows generally MEDIUM values. The number of VLP events shows HIGH values (17.1 events/hour). MODIS/VIIRS thermal data show HIGH thermal anomalies (112 MW). SO2 flux shows MEDIUM values (117 t/d recorded on 21/04/2026). No new data on CO2 flux is available. The rockfall activity is LOW (2 events detected in the last 24h, having LOW seismic pseudo-volumes). The volcanic activity index is MEDIUM.