Volcanic tremor slowly rising
Update Fri 22 Oct 2021 16:09
In tandem with the reported increase of activity in form of strombolian explosions at the SE crater, volcanic tremor has been gradually rising.
Current tremor signal at Etna's ECPN station (image: INGV Catania)
Whether this is a first sign the volcano is heading towards another fire-fountaining episode, known as paroxysm, as it did more than 50 times this year alone so far, will be likely seen in the near future (hours to few days from now).
Etna volcano (Italy): resumption of strombolian activity after month
Fr, 22. Okt 2021, 07:1407:14 AM | VON: MARTIN
Strombolian activity at Etna volcano this morning as seen from Tremestieri (image: Boris Behncke)
After one month since the latest paroxysm episode, strombolian activity has picked up again at 02:47 local time yesterday.
Ash emissions at Etna volcano today (image: Boris Behncke)
Small strombolian explosions started to erupt from the Southeast Crater, which became gradually stronger on 21 October at 17:20 local time and are still continuing at the time of this update.
Sporadic ash emissions are accompanied by small glowing steam and gas plumes dispersing towards the E and SW.
The average amplitude of volcanic tremor varies between low-to-medium levels located at altitude between 2900 m and 3000 m.
Source: National Institute of Geophysics and Volcanology volcano activity update 21 October 2021
Volcano remains restless
Update Fri 22 Oct 2021 07:02
The volcano has remained more or less calm, but it is only a matter of time when activity will pick up again.
False-color satellite image of Etna volcano on 21 Oct 2021, emphasizing thermal anomalies in the summit craters (image: Sentinel Hub)
The summit craters continue to show marked thermal anomalies at the New SE crater, Voragine and Bocca Nuova complex as well as the NE crater. All of these emit gas and steam plumes and instruments detect frequent small acoustitc signals from dee-seated explosions, likely strombolian in type.
The volcanological institute of the University of Florence (LGS) reported more than 6000 infrasonic (explosion-related) events during 24 hours, with maximum pressures of up to 3.21 Pa. Volcanic tremor remains low, but as often in the past, it can change very quickly.
Etna volcano (Italy): new paroxysm from SE crater sends tall ash plume to 9,000 m altitude
Di, 21. Sep 2021, 08:5408:54 AM | VON: T
Ash column from Etna's paroxysm this morning (image: Radio touring webcam)
Thermal image of the lava fountain from the south (image: INGV webcam)
After little more than 3 weeks of calm, the volcano has again produced a violent lava fountaining episode, known as paroxysm, from its SE crater this morning:
Current tremor signal (image: INGV Catania)
At 4.20 a.m. local time, volcanic tremor suddenly began to rise sharply. At 8.15 a.m., ash emissions were seen from the New SE crater, and strombolian explosions started a7 8.55 a.m., generating an ash plume that quickly rose to 4,500 m altitude.
This activity continued to increase, and by 9.55 a.m. resulted in lava fountaining that generated a tall column reaching approx. 9,000 m height and drifting to the ENE. At the time of this update, the activity is still going on, but seems to be reaching its end as tremor started to descend again.
As during the previous paroxysms, a lava flow is traveling from the southern rim of the crater towards the SW.
Etna volcano (Italy): after 3 weeks of calm, another lava fountaining phase is in the making tonight
So, 29. Aug 2021, 15:4915:49 PM | VON: T
Strombolian eruption from the New SE crater of Etna (image: LAVE webcam)
After being mostly calm for about 3 weeks since the violent SE crater paroxysm (or lava fountaining episode) on 9 August this year, the volcano seems to be keen to produce this fiery show of lava fountains once again before the month is over:
Current tremor signal (image: INGV Catania)
Already yesterday, fluctuating tremor heralded some sort of instability in the supply system, although no significant eruptive activity at the craters itself could be noted. Today, the tremor began to rise steeply at 3pm, followed by the resumption of intermittent strombolian activity at the New SE crater.
So far, all looks as if very soon a lava fountaining phase should occur if the volcano follows the pattern of the more than 50 such previous phases during this year. In fact, at the time of finishing this update, the activity already has increased! The next hours will be interesting to follow the volcano live.