Etna quiet again after ash-rich eruptive phase
Update Wed 15 Dec 2021 17:52
Strombolian activity at Etna's New SE crater last night (image: Giuseppe Distefano / Marco Restivo / Etna Walk / facebook)
The activity from the New SE crater yesterday did not develop into a lava fountaining phase such as the many paroxysms observed during this year, although it shared many characteristics of it.
Current tremor amplitude EMFS station (image: INGV Catania)
Rather than sustained fountains with significant amounts of liquid lava bombs, it produced mostly a dense ash column that rose up to 6-7 km altitude (much less than during most paroxysms).
Only little glowing material could be seen in the eruption column. Activity waned at around 5 pm., then picked up again during the evening, to continue with less intensity and mild strombolian eruptions during much of the night. It gradually decreased in the early morning hours and seems to have stopped by now.
The small lava flow that had been erupted in the Valle del Bove during the day before yesterday and yesterday has also stopped.
Etna is again calm, but for how long nobody knows...
Some images of yesterday's activity from Etna Walk:
Increasing ash emissions, New SE crater heading for paroxysm
Update Tue 14 Dec 2021 14:27
Ash column rising from the New SE crater at 15.20 local time (image: INGV webcam Montagnola)
Volcanic tremor amplitude showing the increase typical for paroxysms in their build-up stage (image: INGV Catania)
The activity at the New SE crater has been increasing, with dense ash columns rising to estimated 20,000 / 6 km altitude or more. At the same time, volcanic tremor has been increasing as well. It looks likely that the volcano is about to produce another lava fountaining-phase, known as paroxysm from its most active summit vent.
Last night's lava flow in the Valle del Bove (image: Giuseppe Distefano / Marco Restivo / EtnaWalk / facebook)
It is unclear at the moment whether the lava effusion from the small fissure vent in the Valle del Bove that had opened yesterday still continues.
It had been modestly active throughout the night, producing a small lava flow, but there was no sign of explosive activity. Volcanologists interpreted it as old (degassed) magma from the conduit leading towards the summit vents, that had simply "leaked" through a small lateral fissure. No inflation or particular seismic signals that would be typical for larger flank eruptions involving new magma had been detected accompanying it.
Etna volcano (Italy): new eruptive phase, dense ash emissions from New SE summit crater
Tue, 14 Dec 2021, 12:0412:04 PM | BY: T
A new phase of activity seems to have started a short time ago. Dense ash plumes started to rise from the New SE crater around noon local time.
Dense ash emissions from the New SE crater of Etna a few minutes ago (image: Radio Touring webcam)
We will follow up when more details become available.
Etna volcano (Italy): new lava flow in Valle del Bove
Mon, 13 Dec 2021, 22:3622:36 PM | BY: T
The new vent and lava flow in Etna's Valle del Bove (image: Francesco Caltabiano / EtNativo / facebook)
Mild strombolian explosion at the New SE crater in the evening (image: INGV Catania Montagnola webcam)
A (so far) very small flank eruption started this afternoon or evening in the Valle del Bove at around 2,100-2,200 meters elevation. At the base of the western wall of the volcano's large U-shaped depression on the eastern flank, a fissure opened and became an effusive vent, from which a small lava flows has been descending during the past hours.
Current tremor amplitude at ECBD station (image: INGV Catania)
So far, this activity has been very small. Volcanic tremor has risen only a bit, and no other data suggest that we're about to witness the beginning of a larger flank eruption (although this is still a possibility). At the same time, intermittent, mild strombolian activity continues from the New SE summit crater. Likely, some of the magma inside the conduit feeding this crater has found a lateral exit at lower elevation - the question will be whether this lateral dike can expand and more effectively create a way out for magma stored, or whether it might soon close up again.
Photo credit: Francesco Caltabiano / EtNativo / facebook
weak but constant strombolian activity continues
Update Mon 06 Dec 2021 18:14
Ongoing strombolian activity is now in progress from the South-East crater characterized by weak ash emissions extending to the E-NE of the volcano today.
Continuous ash emissions from Etna today (image: Boris Behncke/twitter)
A volcanic tremor has slowly increased, but remains at medium values detected at 2700 meters altitude.
No significant ground deformation was recorded.