The number of VLP seismic events (standard values 5-12) is medium, 9.5 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.17 bar (standard values <1 bar). The amplitude of puffing is low, ~30 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 high. The number of rockfalls is 14 per day.

SO₂ flux in the NE sector of the crater terrace is high, 211 t/d

CO₂ flux based on the C/S of 54.62 mesured at 17:20 UTC on 2024/09/28 is very high, 3444 t/d

Indice di Attività Vulcanica: high

• Seismic (VLP) rate MEDIUM
• Seismic tremor MEDIUM
• Puffing LOW
• Acustic pression of explosions LOW
• Thermal activity NOT AVAILABLE
• SO₂ flux HIGH
• CO₂ flux VERY HIGH
• Rockfall activity HIGH

The volcanic activity is generally characterized by strombolian explosions and puffing mainly located at NE crater sector. In the last 24h, the Stromboli volcano shows a MEDIUM degassing activity (puffing 30 mbar). The pressure of the explosions is MEDIUM (max acoustic pressure 0.17 bar). The thermal activity cannot be evaluated due to technical problems. The volcanic tremor shows MEDIUM values. The number of VLP events is MEDIUM (9.5 events/hour). MODIS and VIIRS satellite images show no thermal anomalies due to cloud cover. The SO2 flux is HIGH (211 t/d). The CO2 flux, based on the C/S ratio of 54.62 measured on 28/09/2024 at 17:20 UTC, is VERY HIGH (3444 t/d). The rockfall activity is HIGH (14 events detected in the last 24h, with LOW to HIGH seismic pseudo-volumes involved). The volcanic activity index is HIGH. NB: Infrasonic data values could be underestimated due to unfavourable acquisition conditions (wind and cloud cover).