The number of VLP seismic events (standard values 5-12) is medium, 11.4 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.3 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 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 low: 2 MW (01:48 UTC yesterday).

Rockfall activity is high. The number of rockfalls is 18 per day.

SO₂ flux in the NE sector of the crater terrace is low, 69 t/d

CO₂ flux based on the C/S of 20.63 mesured at 13:20 UTC on 2025/07/27 is high, 1457 t/d

Indice di Attività Vulcanica: medium

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

The volcanic activity is characterized by Strombolian explosions located at the NE and SW crater sectors. In the last 24 hrs, Stromboli volcano showed degassing activity oscillating from MEDIUM to HIGH level (puffing/spattering up to 50 mbar) located at SW crater. The explosive activity is MEDIUM max acoustic pressure 0.37 bar). The volcanic tremor shows MEDIUM values. The number of VLP events show an increase but stay at MEDIUM level (11.4 events/hour). MODIS/VIIRS thermal data show LOW thermal anomalies (2 MW) in the last 24 hrs. The SO2 flux shows LOW values (last: 69 t/d). The CO2 flux in the last 24h, retrieved by C/S of 20.63 recorded at 13:20 of yesterday, shows HIGH level (1457 t/d). The rockfall activity is HIGH (18 events detected in the last 24h having LOW seismic energies). The volcanic activity index is MEDIUM.