The number of VLP seismic events (standard values 5-12) is medium, 7.7 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.13 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 28 per day.

SO₂ flux in the NE sector of the crater terrace is low, 53 t/d

CO₂ flux based on the C/S of 15 mesured at 19:20 UTC on 2025/03/20 is medium, 500 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, the Stromboli volcano showed a MEDIUM degassing activity (puffing 20 mbar) and MEDIUM pressure of the explosions (up to 0.13 bar) mainly located at the NE crater sector. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (7.7 events/hour). MODIS/VIIRS images don't show thermal anomalies. The SO2 flux measured at the NE crater sector shows LOW values (53 t/d). The CO2 flux, based on a C/S ratio of 15 measured on 20/03/2025 at 19:20 UTC, exhibit MEDIUM values (500 t/d). The rockfall activity is VERY HIGH (28 events in the last 24h having MEDIUM seismic pseudo-volumes). The volcanic activity index is MEDIUM.