The number of VLP seismic events (standard values 5-12) is high, 12.9 events/hour.

The amplitude of seismic tremor is high.

The infrasonic activity is high. The acoustic pressure of explosions is low, 0.35 bar (standard values <1 bar). The amplitude of puffing is medium, ~90 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: 4 MW (11:48 UTC yesterday).

Rockfall activity is medium. The number of rockfalls is 2 per day.

SO₂ flux in the NE sector of the crater terrace is low, 44 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: medium

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

In the last 24h, Stromboli volcano showed a HIGH degassing activity (puffing/spattering with values of about 90 mbar), associated with a MEDIUM explosive activity (max acoustic pressure 0.35 bar) mainly located at the NE crater sector. The volcanic tremor shows HIGH values. The number of VLP events is HIGH (12.9 events/hour). MODIS/VIIRS thermal data show LOW thermal anomalies (max 4 MW). SO2 flux shows LOW values (44 t/d). CO2 flus was not evaluated. The rockfall activity is MEDIUM (2 events detected in the last 24h, with MEDIUM seismic energies). The volcanic activity index is MEDIUM.