The number of VLP seismic events (standard values 5-12) is medium, 7.9 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.74 bar (standard values <1 bar). The amplitude of puffing is medium, ~60 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: no rockfalls detected.

SO₂ flux in the NE sector of the crater terrace is medium, 115 t/d

CO₂ flux based on the C/S of 10.88 mesured at 11:20 UTC on 2025/03/31 is high, 1695 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 MEDIUM
• CO₂ flux HIGH
• Rockfall activity LOW

In the last 24h, Stromboli volcano showed a HIGH degassing activity (puffing 60 mbar) and MEDIUM pressure of the explosions (up to 0.74 bar) located mainly at the NE crater sector. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (7.9 events/hour). MODIS/VIIRS images show no thermal anomalies. The SO2 flux measured at the NE crater sector shows MEDIUM values (115 t/d). CO2 flux, evaluated using the C/S ratio of 10.88 measured on 31/03/2025 at 11:20 UTC, is HIGH (1695 t/d). The rockfall activity is LOW (no events detected in the last 24h). The volcanic activity index is MEDIUM.