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Earth of fire

Actualité volcanique, Article de fond sur étude de volcan, tectonique, récits et photos de voyage

Publié le par Bernard Duyck
Publié dans : #Actualités volcaniques
Cotopaxi on 09/22/2015 - degassing essentially of steam / gas volc. - Photo S.Vallejo / IGEPN

Cotopaxi on 09/22/2015 - degassing essentially of steam / gas volc. - Photo S.Vallejo / IGEPN

Cotopaxi 09/22/2015 - New field of fumaroles on flank O - photo P. Ramón / IGEPN

Cotopaxi 09/22/2015 - New field of fumaroles on flank O - photo P. Ramón / IGEPN

The IG has posted pictures of the summit and its glaciers, affected by the volcanic activity, as I said in the previous article on the Cotopaxi. (note that this information has been put online until 24 .09 evening)


The overflight of 22 September revealed further fracturing of the upper parts of the glaciers, and the terminal glacial tongues on the northern and western flanks of the volcano, in relation to the glacier albedo changes.
An increase in the melting of the base of glaciers, due to the arrival of hot fluids on the surface, result in drainage of these waters, whose volume could fuel the formation of secondary lahars.

 

Cotopaxi overview of 09/22/15 - left, fracturing and landslides in the outer part of the top - right, new fractures in the upper part of the sidewall E - photo S.Vallejo / IGEPN

Cotopaxi overview of 09/22/15 - left, fracturing and landslides in the outer part of the top - right, new fractures in the upper part of the sidewall E - photo S.Vallejo / IGEPN

Cotopaxi overview of 09/22/2015 - fracturing and melting of the base of glacier tongues, left, on the SW flank and right, on the side N-NO - Ramón P. Photo / IGEPN

Cotopaxi overview of 09/22/2015 - fracturing and melting of the base of glacier tongues, left, on the SW flank and right, on the side N-NO - Ramón P. Photo / IGEPN

Several landslides have been seen inside and outside of the crater. The increase of the fumerolian activity of the volcano is also marked by the presence of more sites with greenish yellow deposits, possibly sulfur, located primarily on the east and south sides, in the south of the summit and on the internal circular glacier, of which a great part has disappeared.

Cotopaxi overview of 09/22/2015 - left, greenish-yellow deposits on the SE and E sides, in areas where the fumerolienne activity increased. Right, similar deposits in the inner ring of the arena and the SW sector of the circular glacier - Photo: Ramon P. / IGEPN

Cotopaxi overview of 09/22/2015 - left, greenish-yellow deposits on the SE and E sides, in areas where the fumerolienne activity increased. Right, similar deposits in the inner ring of the arena and the SW sector of the circular glacier - Photo: Ramon P. / IGEPN

All of these abnormalities have not been measured with the thermal camera due to a persistent cloudiness. Highest TMA / maximum effective temperature value was 35.3 ° C, corresponding to those of the side fumerolian field. (photo in the previous article)

Lesser values ​​were measured inside the crater, that may result from reflection due to gaseous emissions, and on the south side, almost permanently covered by clouds.

 

IGEPN 24.09.2015 – Resumen de las observaciones effectuadas durante el vuelo al volcan Cotopaxi del dia 22 de sept de 2015. - link

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