The number of VLP seismic events (standard values 5-12) is medium, 8.8 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.38 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: 1.11 MW (01:24 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 15 per day.

SO₂ flux in the NE sector of the crater terrace is low, 58 t/d

CO₂ flux based on the C/S of 19.59 mesured at 03:20 UTC on 2025/05/21 is medium, 789 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 MEDIUM
• Rockfall activity MEDIUM

The volcanic activity is characterized by Strombolian explosions and degassing (puffing/spattering) mainly located at NE/SW crater sectors. In the last 24h, the degassing activity showed HIGH values (50 mbar), with MEDIUM acoustic pressure of the explosions (max acoustic pressure 0.38 bar). The volcanic tremor is stable at MEDIUM values. The number of VLP events is MEDIUM (8.8 events/hour). MODIS/VIIRS thermal data show LOW thermal anomalies (max 1.11 MW). SO2 flux shows LOW values (last: 58 t/d ). The CO2 flux, estimated using a C/S ratio of 19.59 measured on 21/05/2025 at 03:20 UTC, shows MEDIUM values (789 t/d). The number of rockfall is HIGH (15 events detected in the last 24h having LOW seismic pseudo-volumes involved). The volcanic activity index is MEDIUM.