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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
. Popocatépetl - activity  04.09.2021 / 1:02 p.m. - WebcamsdeMexico

. Popocatépetl - activity 04.09.2021 / 1:02 p.m. - WebcamsdeMexico

After 3 explosions on September 2 and one on September 3, the activity of Popocatépetl was characterized on September 4 by 96 exhalations accompanied by water vapor and volcanic gases during the last 24 hours, and the recording of 106 minutes low amplitude tremor.

During the last 24 hours, Cenapred reports on September 5, thanks to the monitoring systems of the Popocatepetl volcano, that 79 exhalations accompanied by water vapor and volcanic gases have been identified, and 186 minutes of low amplitude tremor.

The Cenapred recommends not to approach the volcano and especially the crater, because of the danger of falling ballistic fragments and, in the event of heavy rains, to stay away from the bottom of the ravines because of the danger of mud. streams and garbage.

The Popocatépetl volcanic alert remains at Amarillo Fase 2.

 

Sources; Cenapred and webcams from Mexico

Popocatépetl - activity of 05.09.2021 - Doc. Cenapred

Popocatépetl - activity of 05.09.2021 - Doc. Cenapred

In Iceland, the concern concerns three areas: the Reykjanes Peninsula, Vatnajökull, and Askja.

At Fagradalsfjall, the drop in tremor during the day of September 2 was not followed by a remarkable rise; On the morning of September 6, the level of the tremor remains relatively low. It's the longest break since March 19. It cannot be excluded that there is a change in the current eruption.

Fagradalsfjall - Variations of tremor at 06.09.2021 - Doc. Hraun.vedur.is

Fagradalsfjall - Variations of tremor at 06.09.2021 - Doc. Hraun.vedur.is

The National Police Commissioner, in consultation with the Southern Police Commissioner, decreed the level of danger to civil protection due to Skaftárhlaup / Vatnajökull - Grimstvötn.

Runoff from the Eystri-Skaftár cauldron began around noon on September 5, but runoff from the eastern boiler is generally larger than that from the western boiler.

The ice cave is expected to decrease by 60-100m in total. This glacial breakup comes after a jökulhlaup of the western cauldron which is now terminally ill.

The current western cauldron debacle has raised the groundwater level and as a result, the eastern cauldron may spread more in the flooded area than in 2018. In addition to this, considerable precipitation was also observed in the area. these last hours. In addition to the upcoming circular route flooding, the flooding will invade pasture areas and leave large amounts of glacial mud.

Hydrogen sulfide moves with running water when it comes from a glacier. Its concentration is so high that it can damage the mucous membranes of the eyes and respiratory tract. Tourists are therefore strongly advised to stay away from the Skaftár Canal above Skaftárdalur as well as the edges of Skaftárjökull, Tungnárjökull and Síðujökull during the race.

Cracks will form around the cauldrons very quickly, so tourists to Vatnajökull should stay away from these areas, as well as the edges of Skaftárjökull, Tungnárjökull and Síðujökull where running water could rise to the surface.

Jökulhlaup in the Skaftá river - photo Gisli olfsson 05.09.2021

Jökulhlaup in the Skaftá river - photo Gisli olfsson 05.09.2021

GPS measurements at the Eystri-Skaftárkatli cauldron on 05.09.2021 / 19:30 - Doc. Vedur.is

GPS measurements at the Eystri-Skaftárkatli cauldron on 05.09.2021 / 19:30 - Doc. Vedur.is

Real-time monitoring map of the Skaftár area with the flow figures for this morning September 5th. - Doc. IMO

Real-time monitoring map of the Skaftár area with the flow figures for this morning September 5th. - Doc. IMO

According to Freysteinn Sigmundsson, a geophysicist at the Institute of Earth Sciences at the University of Iceland, there are reasons to take the situation around Askja seriously. The ground has risen a few centimeters after subsisting continuously for 40 years and there are indications of a slight increase in seismic activity in the area.

The magma is flowing in the depths of the volcano right now, and now is the time to be more vigilant and exercise increased surveillance of the volcano.

 

Sources: IMO, Visir, mbls

Askja - photo archives Tour guide in Iceland 2019

Askja - photo archives Tour guide in Iceland 2019

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