The number of VLP seismic events (standard values 5-12) is medium, 5.2 events/hour.

The amplitude of seismic tremor is very high.

The infrasonic activity is very high. The acoustic pressure of explosions is medium, 1.03 bar (standard values <1 bar). The amplitude of puffing is very high, ~234.5 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 medium: 34 MW (02:15 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 8 per day.

SO₂ flux in the NE sector of the crater terrace is medium, 174 t/d

CO₂ flux based on the C/S of 7.15 mesured at 19:20 UTC on 2024/09/13 is medium, 1294 t/d

Indice di Attività Vulcanica: high

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

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 VERY HIGH degassing activity (puffing 234.5 mbar). The pressure of the explosions is HIGH (max acoustic pressure 1.03 bar). The number of thermal transients detected from thermal camera is not avaiable. The volcanic tremor shows VERY HIGH values. The number of VLP events is MEDIUM (5.2 events/hour). MODIS/VIIRS images show MEDIUM thermal anomalies (max 34 MW). The SO2 flux measured at the NE crater sector is MEDIUM (174 t/d). The CO2 flux, based on the C/S ratio of 7.15, measured on 13/09/2024 at 19:20 UTC, is MEDIUM (1294 t/d). The rockfall activity is MEDIUM (8 event detected in the last 24h), with LOW to HIGH seismic pseudo-volumes involved. The volcanic activity index is HIGH. NB: VLP rate and infrasonic activity could be underestimated due to bad weather conditions