The number of VLP seismic events (standard values 5-12) is medium, 9.9 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.8 bar (standard values <1 bar). The amplitude of puffing is low, ~31 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is low. 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: no thermal anomalies.

Rockfall activity is high. The number of rockfalls is 11 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 76 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: medium

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

The volcanic activity is generally characterized by weak strombolian explosions located at the NE crater sector and degassing (puffing/spattering) located at SW and NE crater sectors. In the last 24h, the Stromboli volcano showed a MEDIUM degassing activity (puffing/spattering with values of about 31 mbar). The explosive activity is MEDIUM (max acoustic pressure 0.8 bar). The volcanic tremor shows MEDIUM values. The number of VLP events shows MEDIUM values (9.9 events/hour). MODIS/VIIRS thermal data shows no thermal anomalies. SO2 flux shows MEDIUM values (last: 76 t/d recorded on the 13/08/2025), CO2 flux shows no new data (last: 963 t/d based on C/S value of 13.97 recorded on the 10/08/2025). The rockfall activity is HIGH (n.11 events detected with LOW to MEDIUM pseudo-volumes associated). The volcanic activity index is MEDIUM.