The number of VLP seismic events (standard values 5-12) is medium, 6 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.3 bar (standard values <1 bar). The amplitude of puffing is low, ~40 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 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: 3 MW (20:05 UTC yesterday).

Rockfall activity is very high. The number of rockfalls is 64 per day.

SO₂ flux in the NE sector of the crater terrace is high, 216 t/d

CO₂ flux based on the C/S of 4.7 mesured at 03:20 UTC on 2024/07/27 is medium, 1034 t/d

Indice di Attività Vulcanica: very high

• Seismic (VLP) rate MEDIUM
• Seismic tremor MEDIUM
• Puffing LOW
• Acustic pression of explosions LOW
• Thermal activity LOW
• SO₂ flux HIGH
• CO₂ flux MEDIUM
• Rockfall activity VERY HIGH

The volcanic activity is generally characterized by feeble degassing activity and few explosions with low pressure with ash emission located at the new NE crater sector. At 7.15pm of yesterday 26 July a rapid sequence of 2 explosive events was recorded and classified as a major explosion. These events are associated with a seismic signal in the VLP band with a maximum amplitude of 2.25x10-5 m (in displacement) and a ground deformation of approximately 1.89 microradians (recorded on the OHO tiltmeter). The explosions, which affected both the NE Crater and the SW Crater, generated a maximum infrasonic pressure of 13.45 Pa. In the last 24h, the Stromboli volcano showed a MEDIUM degassing activity (about 40 mbar). The explosive activity is MEDIUM (few explosion with max acoustic pressure 0.3 bar). No thermal transients (number of explosions) recorded. The volcanic tremor shows MEDIUM values. The number of VLP events showed MEDIUM values (6.0 events/hour). MODIS/VIIRS images showed LOW thermal anomalies (max 3 MW). SO2 flux shows HIGH values (last: 216 t/d recorded on the 27/07/2024), CO2 flux shows MEDIUM values (last: 1034 t/d based on C/S value of 4.7 recorded on the 27/07/2024). The rockfall activity is VERY HIGH (64 events detected with LOW to MEDIUM pseudo-volumes associated). The volcanic activity index is VERY HIGH.