The number of VLP seismic events (standard values 5-12) is medium, 10.6 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.74 bar (standard values <1 bar). The amplitude of puffing is low, ~35.5 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: 2 MW (13:05 UTC yesterday).

Rockfall activity is high. The number of rockfalls is 21 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 172 t/d

CO₂ flux based on the C/S of 9.39 mesured at 11:20 UTC on 2024/09/22 is high, 1682 t/d

Indice di Attività Vulcanica: high

• Seismic (VLP) rate MEDIUM
• Seismic tremor HIGH
• Puffing LOW
• Acustic pression of explosions LOW
• Thermal activity NOT AVAILABLE
• SO₂ flux MEDIUM
• CO₂ flux 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 35.5 mbar). The pressure of the explosions is MEDIUM (max acoustic pressure 0.7 bar). The thermal activity cannot be evaluated due to technical problems. The volcanic tremor shows HIGH values. The number of VLP events is MEDIUM (10.6 events/hour). MODIS/VIIRS images show LOW thermal anomalies (2 MW). The SO2 flux measured at the NE crater sector is MEDIUM (172 t/d). The CO2 flux, based on the C/S ratio of 9.39 measured on 22/09/2024 at 11.20 UTC, is HIGH (1682 t/d). The rockfall activity is HIGH (21 events detected in the last 24h, with LOW to HIGH seismic pseudo-volumes involved). The volcanic activity index is HIGH.