During the week of June 14 to 20 at Etna,
- Strombolian activity, lava fountains and the formation of eruptive columns were observed at the southeast crater;
- an occasional ash emission at the northeast crater and a pulsed degassing with low ash emissions at the Bocca Nuova crater are mentioned by the INGV, as well as an ordinary degassing at the Voragine crater.
New eruptive crises occurred on June 22 and 23.
Details on the 41st crisis, the most recent:
on June 23 from 00:30 UTC, it is possible to observe, from surveillance cameras, the resumption of Strombolian activity at the Southeast crater from at least three eruptive vents.
As of 02:13 UTC, there is also an overflow of lava from the southeast crater that extends in a southwest direction.
Around 02:44 UTC, we observe that the Strombolian activity of the Southeast crater has transformed into a lava fountain.
At 03:17 UTC, based on surveillance camera footage, the southeast crater lava fountain was observed to have ceased.
The eruptive cloud produced exceeded the height of 9 km asl. and according to the forecast model, its dispersion concerned the eastern sector of the volcano with lapilli falling at Fornazzo and Giarre.
Regarding the lava overflow, it seems poorly fed and the front seems to be at the same level as that indicated before, at about 2900 m altitude. In addition, at the end of the lava fountain phase, it was possible to observe that the activity of the Southeast Crater produced a second lava overflow from its eastern edge which headed east without exceeding the base of the crater.
Sources: INGV OE bulletin and communications
The Fagradalsfjall eruption, which began in Geldingadalur on March 19, has now been going uninterrupted for almost three months. During this time, the rash changed rhythm several times. New craters opened or closed, lava flows increased, and their composition changed. The eruption has been a huge challenge for scientists, especially when it comes to predicting the channeling and behavior of lava flows.
The Meteorological Office and the University of Iceland have collaborated on the use and development of lava flow models as part of a project funded by the RANNÍS Research Fund. Lava flow models can continue to be useful in preparing emergency plans.
Fagradalsfjall - modeling of lava flows according to 2 scenarios as of 06.22.2021 - Model: Meteorological Office / University of Iceland / Gro Birkefeldt Möller Pedersen - one click to enlarge
It is not known how long the eruption will last, but it is important to try to predict possible dangers and damage to infrastructure based on development. Attention is now focused on Nátthaga south of the eruption sites and the effect of the lava flow from there on Suðurstrandarvegur and the area down to the sea.
A model is proposed for two possible lava flow scenarios south of Nátthaga. The scenarios assume a lava flow of 3.1 km³ on the one hand and 29 km³ on the other. There is considerable uncertainty as to how long it will take the Nátthaga area to fill before lava begins to flow from the valley.
(Model: Meteorological Office / University of Iceland / Gro Birkefeldt Möller Pedersen)
Between June 14 and 20, activity in Sabancaya, Peru, remained at a moderate level, with an average of 80 explosions per day, accompanied by ash plumes up to 2,300 meters above the summit.
During the period analyzed, I.G. Peru detected 1,026 earthquakes of volcanic origin associated with the circulation of internal magmatic fluids. Volcano-tectonic earthquakes, from M 1.8 to 3.5, occurred NE and NW of the volcano.
No significant deformation anomaly, and 7 thermal anomalies, with a maximum value of 15 MW are identified, in connection with the presence of a surface lava body in the crater.
The alert level remains in Naranja, with a ban on access within a radius of 12 km radius.
Source: I.G. Peru