The number of VLP seismic events (standard values 5-12) is medium, 9.1 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.15 bar (standard values <1 bar). The amplitude of puffing is low, ~30 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: no thermal anomalies.

Rockfall activity is low. The number of rockfalls is 1 per day.

SO₂ flux in the NE sector of the crater terrace is low, 46 t/d

CO₂ flux based on the C/S of 12.56 mesured at 01:20 UTC on 2025/04/13 is medium, 909 t/d

Indice di Attività Vulcanica: medium

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

In the last 24h, Stromboli volcano showed MEDIUM degassing activity (puffing/spattering with values of about 30 mbar), associated with a MEDIUM explosive activity (max. acoustic pressure 0.27 bar) located at both crater sectors, with a persistant puffing signal detected from the SW crater area. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (9.1 events/hour). MODIS and VIIRS satellite information is not available due to cloud coverage. SO2 flux is LOW (46 t/d). The CO2 flux is MEDIUM (daily mean flux of 909 t/d based on a C/S ratio of 12.56 measured 13/04/2025 at 01:20 UTC). The rockfall activity is LOW, with 1 events detected in the past 24 hours. The Volcanic Activity Index is MEDIUM.