Bulletins | LGS

Bulletins

Bulletin n. 6933

12/02/2024 - 10:13

The number of VLP seismic events (standard values 5-12) is medium, 10.9 events/hour.

The amplitude of seismic tremor is medium.

The infrasonic activity is medium. The acoustic pressure of explosions is low, 0.15 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 low, 12. The amplitude of thermal transients is low, 5 ºF. Exit velocity of pyroclasts, estimated through thermal camera analysis, is low, 10 m/s.

MODIS thermal anomalies: no thermal anomalies.

Rockfall activity: no rockfalls detected.

SO2 flux in the NE sector of the crater terrace is low, 39 t/d

CO2 flux based on the C/S of 15.51 mesured at 08:20 UTC on 2024/02/12 is medium, 899 t/d

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 MEDIUM
  • Rockfall activity LOW

The volcanic activity is characterized by strombolian explosions and degassing activity (puffing) mainly located at the SW crater sector. The number of VLP events shows MEDIUM values (10.9 events/hour). Infrasonic activity is characterized by explosions of MEDIUM pressure (0.15 bar) and puffing from MEDIUM amplitude (40 mbar). Seismic tremor values are MEDIUM. Thermal activity at the craters is LOW. MODIS/VIIRS images doesn't show thermal anomalies. The SO2 flux based on early measures of today shows a decrease towards LOW values (39 t/d). The CO2 flux is MEDIUM (899 t/d) based on C/S ratio of 15.51 measured at 08:20UTC of today. Rockfall activity is absent. The volcanic activity index is MEDIUM. NB: Thermal and Infrasonic values could be underestimated due cloud cover.