The number of VLP seismic events (standard values 5-12) is medium, 8.2 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, ~35 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: 1 MW (11:30 UTC yesterday).

Rockfall activity is low. The number of rockfalls is 3 per day.

SO₂ flux in the NE sector of the crater terrace is low, 36 t/d

CO₂ flux based on the C/S of 25.7 mesured at 05:25 UTC on 2025/03/27 is medium, 1032 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, the Stromboli volcano showed a MEDIUM degassing activity (puffing 35 mbar) and MEDIUM pressure of the explosions (up to 0.8 bar) located at the NE and SW crater sectors. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (8.2 events/hour). MODIS/VIIRS images show LOW thermal anomalies (max 1 MW). The SO2 flux measured at the NE crater sector shows LOW values (36 t/d). CO2 flux, evaluated using the C/S ratio of 25.7 measured on 27/03/2025 at 05:25 UTC, is MEDIUM (1032 t/d). The rockfall activity is LOW (3 events in the last 24h having LOW seismic pseudo-volumes). The volcanic activity index is MEDIUM.