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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

At 07:12 UTC on 27 June , a strombolian activity has resumed at the South-East Crater of Etna, producing an ash cloud that is moving eastwards.

Strombolian activity in the southeast crater is gradually increasing, producing modest ash emissions. In addition, a southwestward overflow of lava is underway.

At 08:10 UTC, the amplitude of the volcanic tremor is at high values with an increasing trend.

From about 09:00 UTC, the surveillance cameras observe the transition from strombolian activity in the southeast crater to a lava fountain. The activity occurs from three vents in the western part of the southeast crater.

 Etna SEC - 27.06.2021 / 08h26 UTC - webcam EMOT INGV

Etna SEC - 27.06.2021 / 08h26 UTC - webcam EMOT INGV

 Etna SEC - 27.06.2021 / 10h28 - new webcam LAVE

Etna SEC - 27.06.2021 / 10h28 - new webcam LAVE

By 09:50, lava spouting activity in the south-east crater has ceased, but ash emission continues; the eruptive column reaches a height of 9-10 km, heading east-southeast. Volcanic ash fallout is reported on the eastern flank of the volcano.

The INGV reports at 12.27 pm that explosive activity in the south-east crater has ceased. The lava flow emitted from the "saddle mouth" of the southeast crater is no longer fed, but is still extending southwestwards, with an active front at an altitude of about 2700 m.

 

Source: INGV

Etna SEC - 27.06.2021 / 09h48 UTC - end of fountaining, and continued ash emission - INGV EMOT webcam

Etna SEC - 27.06.2021 / 09h48 UTC - end of fountaining, and continued ash emission - INGV EMOT webcam

Etna - ash plume from the SE crater on the morning of 27.06.2021 - photo by Boris Behncke

Etna - ash plume from the SE crater on the morning of 27.06.2021 - photo by Boris Behncke

Etna - the trace of 2 eruptions on one image: SO2 plume of 27 and 26.06 - Doc. Adam Platform / Sentinel -5P

Etna - the trace of 2 eruptions on one image: SO2 plume of 27 and 26.06 - Doc. Adam Platform / Sentinel -5P

 Etna - tremor variations at 28.06.2021 / 08h - Doc. INGV OE

Etna - tremor variations at 28.06.2021 / 08h - Doc. INGV OE

At Reventador in Ecuador, the IGEPN reports the observation on 27 June 2021 of ash emissions at an average height of 1,000 metres above the crater, and the descent of incandescent blocks on the south-eastern flank over a distance of up to 800 metres below the crater level

Seismicity is characterised by 12 LP earthquakes, 55 explosion earthquakes; and 8 tremor episodes.

Two thermal anomalies have been recorded in the last 24 hours.

The alert level remains at naranja

 

Source: Instituto Geofísico

  Reventador - 27.06.2021 / 13h23 UTC - webcam IGEPN

Reventador - 27.06.2021 / 13h23 UTC - webcam IGEPN

SENTINEL-2 and Lansat 8 / USGS satellite images from 26 June 2021 of the Fagradalsfjall eruption show that there is still considerable activity in the lava fields of the Meradalur and Geldingadalur valleys.

The most active areas remain the crater and the lava rivers (in white), the high temperature lava field is coloured red and yellow.

  Fagradalsfjall - thermal anomalies - Sentinel-2 SWIR image / bands 12,8A,4 - one click to enlarge

Fagradalsfjall - thermal anomalies - Sentinel-2 SWIR image / bands 12,8A,4 - one click to enlarge

Fagradalsfjall - thermal anomalies in Geldingadalur - Landsat8 USGS image 26.06.2021

Fagradalsfjall - thermal anomalies in Geldingadalur - Landsat8 USGS image 26.06.2021

" The temperature of the magma rising in the crater is about 1200 degrees," says Þorvaldur Þórðarson, professor of volcanology at the University of Iceland. " It is therefore clear at the time the photo was taken that there is a large lava flow in the southwestern part of Geldingadalur and also in the western part. The photo also shows that a channel extending eastwards is pumping magma down the slope into Merardalur. Two yellow dots in the picture are puddles where lava has accumulated ". (interview in RUV)

 

Sources: RUV, Benjamin hennings, Sentinel-2 and Landsat 8

Fagradalsfjall - extent of the lava field on 27.06.2021 - Benjamin Hennig - one click to enlarge

Fagradalsfjall - extent of the lava field on 27.06.2021 - Benjamin Hennig - one click to enlarge

Fagradalsfjall - lava front towards the tip of the Natthaga valley (in fog) - photo 27.06.2021 Benjamin Hennings -Tw

Fagradalsfjall - lava front towards the tip of the Natthaga valley (in fog) - photo 27.06.2021 Benjamin Hennings -Tw

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