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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

Over the past week, there have been several eruptive episodes at the southeastern crater (SEC) of Etna, which occurred on May 24, 25, 26, 27, 28 and 30, respectively. Most of these events consist of the resumption of strombolian activity at the SEC followed by a gradual intensification of the eruptive phenomenon until, in some cases, a sustained lava fountain. This activity was also accompanied by lava overflows which moved towards the southwest, always remaining in the summit area.

Etna SEC -  activity between May 24 and 30, 2021 - Doc. INGV - one click to enlarge

Etna SEC - activity between May 24 and 30, 2021 - Doc. INGV - one click to enlarge

The mean amplitude of the volcanic tremor, after a first increase around 06:00 UTC on June 2, showed around 08:00 a sudden increase reaching high levels.

From around 08:30 UTC, the transition of Strombolian activity from the Southeast Crater to a lava fountain is observed from surveillance cameras. Based on the forecast model, the eruptive cloud disperses eastward.

At approximately 10:45 UTC, the lava fountain in the southeast crater ceased.

Etna SEC - activity on June 2, respectively at 8:09 am, 8:37 am, 9:02 am and 9:53 am - INGV webcams - one click to enlargeEtna SEC - activity on June 2, respectively at 8:09 am, 8:37 am, 9:02 am and 9:53 am - INGV webcams - one click to enlarge
Etna SEC - activity on June 2, respectively at 8:09 am, 8:37 am, 9:02 am and 9:53 am - INGV webcams - one click to enlargeEtna SEC - activity on June 2, respectively at 8:09 am, 8:37 am, 9:02 am and 9:53 am - INGV webcams - one click to enlarge

Etna SEC - activity on June 2, respectively at 8:09 am, 8:37 am, 9:02 am and 9:53 am - INGV webcams - one click to enlarge

In accordance with the forecast model, the dispersion concerned the eastern sector of the volcano. INGV staff in the field report the fallout from the products north of Zafferana, in the town of Petrulli and in Santa Venerina.

Due to cloud cover, it was not possible to determine the height of the eruptive cloud, but from information received from INGV personnel in the field, the cloud reached a height of about 5-6 km above sea level.

Etna - ash and fog affect the north of Zafferana - photo Boris Behncke 02.06.2021

Etna - ash and fog affect the north of Zafferana - photo Boris Behncke 02.06.2021

In addition, the lava fountain produced an overflow of lava from the southern slope of the southeast crater, which spread to the southwest.
From around 10:20 UTC a rapid decrease in the mean amplitude values ​​of the volcanic tremor is observed, which always remains at a high level, with even an increasing trend; it results from 2:00 p.m. UTC by an increase in the explosive activity of the SEC.

From around 6:50 p.m., a small strombolian activity is observed at the SEC

 

Sources: INGV OE & Tropomi

Etna - trémor at 03.06.2021 / at 7am - Doc. INGV OE

Etna - trémor at 03.06.2021 / at 7am - Doc. INGV OE

Etna - strong plume of sulfur dioxide with 24.71DU of SO2 at an altitude of ~ 12km on 06/02/2021 - Sentinel-5P tropomi / DLR / BIRA / ESA

Etna - strong plume of sulfur dioxide with 24.71DU of SO2 at an altitude of ~ 12km on 06/02/2021 - Sentinel-5P tropomi / DLR / BIRA / ESA

The graphics below tell the story of La Soufrière de St. Vincent, the  eruption from its onset in December 2020 to current conditions.

The volcano is still in a state of unrest and access is prohibited for the moment. We can remember the dates of the different phases of the eruption, the announcements and follow-ups by the different teams.

Soufriere of St Vincent - timeline of events - Doc. UWI-SRC - one click to enlarge
Soufriere of St Vincent - timeline of events - Doc. UWI-SRC - one click to enlarge
Soufriere of St Vincent - timeline of events - Doc. UWI-SRC - one click to enlarge

Soufriere of St Vincent - timeline of events - Doc. UWI-SRC - one click to enlarge

A small break in the cloud cover on May 13 and 18 revealed the presence of a hot spot at the summit. Then, the occultation remained total.

 

Sources:

- Volcano Ready Community Project (VRCP). The project is funded by the Caribbean Development Bank through the Community Disaster Risk Reduction Fund

- Sentinel Hub

Soufrière de St. Vincent - hot spot in the crater - image Sentinel-2 bands 12,11,4 from 13.05.2021

Soufrière de St. Vincent - hot spot in the crater - image Sentinel-2 bands 12,11,4 from 13.05.2021

Details on the eruption of Nyiragongo:

The Virunga Volcanoes Supersite has uploaded radar images from the Sentinel-1 satellite illustrating a continuous collapse and expansion of the summit crater of the volcano between May 16 and June 1, 2021.

The lava lake was emptied and the current ash plumes are linked to the pit crater collapses.

 

Source: Virunga Volcanoes Supersite

Nyiragongo - Cosmo sky med images from 05.16.2021 to 06.01.2021 - Doc. Virunga Volcanoes Supersite / Twitter - one click to enlarge

Nyiragongo - Cosmo sky med images from 05.16.2021 to 06.01.2021 - Doc. Virunga Volcanoes Supersite / Twitter - one click to enlarge

Nyiragongo - evolution of the crater - Cosmo sky med images from 05.16.2021 to 06.01.2021 - Doc. Virunga Volcanoes Supersite / Twitter - one click to enlarge

Nyiragongo - evolution of the crater - Cosmo sky med images from 05.16.2021 to 06.01.2021 - Doc. Virunga Volcanoes Supersite / Twitter - one click to enlarge

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