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The volcanic ashes

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The volcanic ashes

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International Space Station view of Sarychev Volcano (Kuril Islands, in Russia) in an early stage of eruption on June 12th, 2009. Ash from the multi-day eruption was detected along the main air routes between East Asia and North America, and commercial airline flights were diverted away from the region to minimize the danger of engine failures from ash intake. (NASA).

Source : https://svs.gsfc.nasa.gov/11446

In some big eruption, the ash plume can look like an umbrella pine when the plume rises to a great height on a sort of trunk and then split off into branches. The umbrella part is formed because the plume is having the same density as the surrounding atmosphere. When there is a lot of wind in the upper atmosphere, the ashes can be spread out in the direction of the wind.
This type of clouds is call “plinian” in honnor to Pliniy the Elder.

Artist’s interpretation of the death of Pliny the Elder during Vesuvius’s eruption.

Source : www.awesomestories.com/asset/view/D...

They can be constituted of fresh magma which is composed of a mixture of glass and minerals, and/or Or Métal précieux. Dans le cadre du séjour Le TrésOR des MINES nous chercherons de l’or dans le Val d’Anniviers, à la batée. fragments of pre-existing rocks.

After a cloud of ashes, the largest ashes fall on slopes of volcano or Or Métal précieux. Dans le cadre du séjour Le TrésOR des MINES nous chercherons de l’or dans le Val d’Anniviers, à la batée. at several dozens of kilometers. The eruptions can be beautiful but the clouds of ashes may be dangerous. During the worst part of this event, the quantity of ashes can be so important that it hides the light of the sun during several days to years. They can make problems to the planes which fly in a cloud of ashes, make the air unbreathable and cause famine.

A plane landing in Chile, in 2011, after Cordon-Puyehue eruption.
Crop dammage in Indonesia.

Written by Simon MEILHAUD DORNIC and Anne MONNIER, participants of the scientific camp, Volcano Alert, in August 2018.

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