The number of VLP seismic events (standard values 5-12) is medium, 6.7 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.22 bar (standard values <1 bar). The amplitude of puffing is low, ~40 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: 1.09 MW (00:24 UTC yesterday).

Rockfall activity is high. The number of rockfalls is 34 per day.

SO₂ flux in the NE sector of the crater terrace is low, 57 t/d

CO₂ flux based on the C/S of 9.96 mesured at 17:20 UTC on 2025/03/19 is medium, 734 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 HIGH

In the last 24h, the Stromboli volcano showed a MEDIUM degassing activity (puffing 40 mbar) and MEDIUM pressure of the explosions (up to 0.22 bar). The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (6.7 events/hour). however, this value may be underestimated due to problems in the continuity of the data. MODIS/VIIRS images show LOW thermal anomalies. The SO2 flux measured at the NE crater sector shows LOW values (57 t/d). The CO2 flux, based on a C/S ratio of 9.96 measured on 19/03/2025 at 17:20 UTC, exhibit MEDIUM values (734 t/d). The rockfall activity is HIGH (34 events in the last 24h having LOW seismic pseudo-volumes). The volcanic activity index is MEDIUM.