The number of VLP seismic events (standard values 5-12) is medium, 11.1 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.72 bar (standard values <1 bar). The amplitude of puffing is low, ~20 mbar.

Tiltmeters analysis does not show any significant deformation of the volcano edifice

Thermal activity of explosive events is low. The number of thermal transients in the NE sector of the crater (standard = 100) is low, 13. The amplitude of thermal transients is low, 0.32 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is medium, 21 m/s.

MODIS thermal anomalies: no thermal anomalies.

Rockfall activity is low. The number of rockfalls is 3 per day.

SO₂ flux in the NE sector of the crater terrace is low, 62 t/d

CO₂ flux based on the C/S is not available

Indice di Attività Vulcanica: medium

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

The volcanic activity is characterized by strombolian explosions and degassing activity (puffing). In the last 24 house Stromboli volcano show MEDIUM degassing activity (puffing of 20 mbar medium aplitude) and MEDIUM values of acoustic pressure of explosions (max 0.72 bar). The number of VLP events shows MEDIUM values (11.1 events/hour). Thermal activity is characterized by a LOW number of transients having LOW thermal amplitude and MEDIUM exit velocity of pyroclasts. MODIS/VIIRS images showed NO thermal anomalies. SO2 flux shows LOW values (62 t/d). CO2 flux values are not available. Rockfall activity is LOW with 3 events detected in the last 24h generating LOW seismic energies. The volcanic activity index is MEDIUM. N.B.: thermal data, infrasonic data and VLP rate could be underestimated due to bad weather conditions and technical problems of the seismic stations.