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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
Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

On July 6, 2021 around 9:30 p.m. UTC, the resumption of Strombolian activity at the level of the south-eastern crater of Etna is observed. According to the forecast model, the ash produced by the current activity is dispersed in the SE direction. This activity intensifies from 10 p.m. UTC.
From 22:30 UTC, the gradual transition from Strombolian activity to the form of a lava fountain is observed at the SE crater. According to the forecast model, the eruptive cloud produced by the current activity disperses in the S direction, reaching a height of about 5000 m above sea level.

Observations made by INGV staff present in the field show an abundant fallout of coarse material that covers the sides of the cone of the south-eastern crater up to the area of ​​the ancient Torre del Filosofo. A relapse of lapilli is reported in Tremestieri and Nicolosi, on the southern slope.

Etna - trémor at 07.07.2021 / 07h- Doc. INGV OE

Etna - trémor at 07.07.2021 / 07h- Doc. INGV OE

Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

Etna SEC- activity seen from Tremestieri (a little blurred by the falls of pyroclasts) on July 6, 2021 - photo Boris Behncke

The lava fountain of the southeast crater ceased its activity a little after midnight, while a weak Strombolian activity with ash emission continues on July 7. The eruptive activity produced a small lava flow from the southern flank of the cone of the southeast crater. The flow, which was heading towards the SW, is currently fed and is located at an altitude of about 2800 m above sea level.

 

In its weekly report, the INGV displays a map of the flows between June 28 and July 4.

The full article can be read by following this link: https://buff.ly/3jNUuRF
 

 

Source: INGV OE

Map of the Etna flows from June 28 to July 1 and 4 on a shaded model of the terrain. BN: Bocca Nuova, VOR: Voragine; NEC: northeast crater; SEC: south-eastern crater. The base the topographic reference on which the morphological updates have been superimposed is DEM 2014 developed by the Aerogeophysical Laboratory-Section Rome 2 / via INGV OE - one click to enlarge

Map of the Etna flows from June 28 to July 1 and 4 on a shaded model of the terrain. BN: Bocca Nuova, VOR: Voragine; NEC: northeast crater; SEC: south-eastern crater. The base the topographic reference on which the morphological updates have been superimposed is DEM 2014 developed by the Aerogeophysical Laboratory-Section Rome 2 / via INGV OE - one click to enlarge

According to IGPeru, the eruptive activity of Sabancaya remained at moderate levels during the week of June 28 to July 4, 2021. An average of 91 daily explosions were observed, accompanied by plumes of gas and ash reaching up to 3,000 meters above the summit.

During this week, 1,103 volcanic earthquakes associated with the circulation of internal fluids were analyzed; VT earthquakes, related to the fracturing of rocks, occurred mainly to the northwest and northeast of the volcano, of magnitude between 1.9 and 3.6.

No significant variations in deformation.

Eleven thermal anomalies were identified by satellite, with a maximum of VRP 56 MW. Two hot spots were visible on the Sentinel-2 images.

The volcanic alert remains in Naranja, with an inaccessible area 12 km in radius around the crater.

 

Sources: I.G. Peru, Mirova and Sentinel-2

Sabancaya - thermal anomalies, with 2 hot spots in the crater - image Sentinel-2 bands 12,11,8A of 06.28.2021 / 2:57 p.m. - one click to enlarge

Sabancaya - thermal anomalies, with 2 hot spots in the crater - image Sentinel-2 bands 12,11,8A of 06.28.2021 / 2:57 p.m. - one click to enlarge

Sabancaya - activity between 28.06.2021 and 04.07.2021 - Doc. I.G. Peru

Sabancaya - activity between 28.06.2021 and 04.07.2021 - Doc. I.G. Peru

In recent days, the rhythm of the eruption at Fagradalsfjall has changed somewhat. The rash subsided but resumed, with so-called rash pauses.
Ármann Höskuldsson, a volcanologist, was at the eruption site says lava was still flowing under the crust. The eruption would not have stopped: the eruption was never very powerful, and given the height taken by the crater, it is easier for it to flow directly into the lava field rather than to s' rise to get out of the crater.

Fumaroles are still emerging from the lava field, and "red" is still visible: the lava is flowing under the surface.

 

Source: interview in RUV

Fagradalsfjall - tremor at 07.07.2021 - Doc. Hraun.is

Fagradalsfjall - tremor at 07.07.2021 - Doc. Hraun.is

Fagradalsfjall - fumaroles on the lava field at 07.07.2021 / 02:50 - webcam_slaga NNA / Veðurstofa Íslands

Fagradalsfjall - fumaroles on the lava field at 07.07.2021 / 02:50 - webcam_slaga NNA / Veðurstofa Íslands

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