The number of VLP seismic events (standard values 5-12) is medium, 6 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.5 bar (standard values <1 bar). The amplitude of puffing is low, ~20 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 very high. The number of rockfalls is 23 per day.

SO₂ flux in the NE sector of the crater terrace is low, 68 t/d

CO₂ flux based on the C/S of 11.49 mesured at 07:20 UTC on 2025/04/17 is medium, 649 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 VERY HIGH

In the last 24h, Stromboli volcano showed MEDIUM degassing activity (puffing/spattering with values of about 20 mbar), associated with a MEDIUM explosive activity (up to 0.8 bar) located at both crater sectors. Puffing signal is limited by the unfavourable weather conditions. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (6 events/hour). No thermal anomalies are detected via MODIS and VIIRS images. SO2 flux is LOw (68 t/d). The CO2 flux, based on a C/S ratio of 11.49 measured at 07:20UTC of today, is MEDIUM. The rockfall activity is VERY HIGH, with 23 events detected in the last 24 hours showing LOW seismic pseudo-volumes. The Volcanic Activity Index is MEDIUM.