September 21 , 2021.
Italy / Sicily , Etna :
COMMUNICATION ON THE ACTIVITY OF ETNA, September 21, 2021, 09:55 (07:55 UTC).
The National Institute of Geophysics and Volcanology, Osservatorio Etneo reports that the current Strombolian activity in the Southeast Crater has gradually passed to the stage of a lava fountain. The eruptive cloud produced by this activity has reached an altitude of about 9000 m and is dispersing towards the East-North-East. A modest overflow of lava is observed from the cone of the Southeast Crater which heads southwest.
The average amplitude of the volcanic tremor and the infrasound activity show increasing values. The center of gravity of volcanic tremor sources is located in the Southeast Crater area at an altitude of about 2900-3000 m above sea level.
GNSS network data does not show significant changes. The inclinometric stations show slight variations. The greatest variations, of the order of 0.8 microradians, are observed at the summit station of Cratère del Piano (ECP).
COMMUNICATION ON THE ACTIVITY OF ETNA, September 21, 2021, 11:27 (09:27 UTC).
The National Institute of Geophysics and Volcanology, Osservatorio Etneo reports that the lava fountain in the Southeast Crater is complete, while weak intracrater Strombolian activity continues. The lava flow heading towards the southwest continues to be fed. A fall of volcanic material transported by the eruptive cloud was reported in Fornazzo, Giarre, Riposto and Mascali.
After reaching the maximum value around 07:45 UTC, the average amplitude of the volcanic tremor showed a gradual decrease, with values still remaining high but with a decreasing trend. The center of gravity of volcanic tremor sources is located in the area of the Southeast Crater at an altitude of about 2900 m above sea level. Along with the changes in amplitude of the tremor, the Infrasound activity also showed a marked decrease in its still ongoing vigor.
No significant change is observed in the signals acquired by the GNSS network. The stations of the inclinometric network recorded slight variations, with the exception of the summit station of Cratère del Piano (CPN), which showed variations of the order of 3 microradians.
Further updates will be communicated shortly.
Source : INGV.
Photo : Guide Alpine Vulcanologiche Etna
