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Earth of fire

Actualité volcanique, Articles de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #volcanic activity

The day was eventful on the south-eastern crater of Etna on June 23, 2021.

After the morning activity (see yesterday's article - link), the INGV announces at 14:38 UTC on 23.06, that from the analysis of the images of the surveillance cameras and the surveys carried out in the area summit by the staff of the INGV Etneo Observatory, it is observed that the two effusive mouths opened on the south-eastern flank of the south-eastern crater at an altitude estimated at around 3000 m and 2950 m above sea level.

Currently, the lava flow of the Quote 3000 m mouth is no longer supplied, while that of the Quote 2950 m mouth is still active, although poorly supplied. The front of the latter reached and passed the western edge of the Valle del Bove to reach an altitude estimated at about 2700 m above sea level. The amplitude of the volcanic tremor is maintained at the average level with a gradual tendency to decrease.

Etna - summit craters - Sentinel-2 band image 12,11,4 from 23.06.2021 - one click to enlarge

Etna - summit craters - Sentinel-2 band image 12,11,4 from 23.06.2021 - one click to enlarge

From approximately 17:45 UTC, a further increase in Strombolian activity at the level of the Southeast crater is observed from the surveillance cameras with the emission of ash which, according to the forecast model, disperse in the direction ESE.

Around 18:00 UTC, we observe that the Strombolian activity of the Southeast crater has gradually passed to a lava fountain
Based on the forecast model, the eruptive cloud, which reaches a height of about 9 km above sea level, disperses in an east-northeast direction. In addition, from 18:28 UTC, we observe the opening of an eruptive vent on the upper eastern slope of the Southeast Crater which produces explosive activity and a lava flow which propagates in an easterly direction. From 18:38, we also observe an overflow of lava that propagates in a southwest direction.

Etna - variations of the tremor with two peaks on 06.23.2021 - Doc INGV OE on 06.24.2021 / 08h - one click to enlargeEtna - variations of the tremor with two peaks on 06.23.2021 - Doc INGV OE on 06.24.2021 / 08h - one click to enlarge

Etna - variations of the tremor with two peaks on 06.23.2021 - Doc INGV OE on 06.24.2021 / 08h - one click to enlarge

Etna SEC - evening activity on 06.23.2021 - photos Boris Behncke
Etna SEC - evening activity on 06.23.2021 - photos Boris Behncke

Etna SEC - evening activity on 06.23.2021 - photos Boris Behncke

Etna SEC - 23.06.2021 / 28h39 - webcam INGV

Etna SEC - 23.06.2021 / 28h39 - webcam INGV

As of 19:00 UTC, the lava fountain in the southeast crater gradually depleted.
After the activity of the lava fountains at the Southeast Crater stopped, a weak Strombolian activity with ash emission continued for a few tens of minutes, which gradually disappeared. During the night and at dawn a weak effusive activity continued at the open mouths at the south-eastern base of the south-eastern crater, which fed a lava flow on the western wall of the Valle del Bove with a front at about 2600 m. At dawn today a small stream was bustling near the effusive mouth, a few tens of meters long.

 

Source: INGV OE

Soufriere de St. Vincent - steam emissions in the crater - flyby by Javid Collins, UWITV on 06.21.2021.

Soufriere de St. Vincent - steam emissions in the crater - flyby by Javid Collins, UWITV on 06.21.2021.

La Soufrière in St. Vincent - SCIENTIFIC UPDATE 06/22/21 1:00 PM


The seismic activity at La Soufrière, St Vincent has remained weak since the tremor associated with the explosion and the ejection of ash on April 22. In the past 24 hours, only a few small earthquakes have been recorded.
Persistent vapor emissions from a few regions within the crater continue to be the dominant observable feature.
Thermal anomalies in the crater continue to be detected but do not indicate that an explosive event is imminent but that there is a heat source, most likely a small body of magma remaining, near the floor of the summit crater.
The sulfur dioxide flux measurement was taken off the west coast on June 18 and gave an average SO2 flux of 479 tonnes / day. SO2 can be an indicator of the outgassing of fresh magma from a deeper source.
An increase in the smell of sulfur in the Richmond and Chateaubelair areas has also been reported. This can happen when the wind direction drives the SO2 plume towards that direction.

The volcano continues to be in a state of turmoil. While volcanic activity is on the decline, the continued presence of near-surface hotspots, daily seismic activity, and substantial outgassing are evidence that the system is still in turmoil and that an escalation in activity may always take place with little or no warning.

The volcano is at the ORANGE alert level.

Source: UWI-SRC

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