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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

The Dukono, on the island of Halmahera, continues its activity.

Based on information from PVMBG and satellite images, VAAC Darwin noted ash plumes between 9 and 13 March and 15 March, amount between 2,400 and 3,000  meters asl, then dispersing of 45 to 100 km on a southern sector. (Source: Global Volcanism Program weekly report)

A video posted on YouTube by Patrick Marcel reveals a continuous loud and explosive activity, amplified by the depth of the crater, and expulsions of bombs ... sometimes out of the crater.





 

Vidéo Patrick Marcel 03.2016

In Sinabung, the activity also continues, with cycles of build-collapse of the summit dome.

In the photos, we can see a channel / avalanche corridor dug by recent pyroclastic flows.
 

Sinabung, the dome - 16.03.2016 / 12h58 pm. - Photo endrolewa

Sinabung, the dome - 16.03.2016 / 12h58 pm. - Photo endrolewa

Sinabung - top, dome and well dug avalanche corridor - photo Hasron David Ginting 16.03.2016 / Beidar Sinabung

Sinabung - top, dome and well dug avalanche corridor - photo Hasron David Ginting 16.03.2016 / Beidar Sinabung

A nice video of an overview of New Zealand's island-volcano of White Island, and sulfur deposits from fumaroles in the areas near the crater lake.

A sulfur mine has been operating on the island between 1885 and 1914, during which it was destroyed by a collapse of the crater wall and a landslide, episode that left 12 dead.

The latest eruptive phase of August, 2012, followed by water activity in early 2013, and a new explosive eruption on 20 August and 11 October 2013.

The results of an exploration of the Colombian island Gorgonilla has just been published ... adding a new chapter to the controversy "volcanoes versus meteorite", responsible for the disappearance in mass of species and the end of the dinosaur era .

Spherulites, elements of the continental shelf of the current Yucatan Peninsula, which merged with meteorite fragments, and formed some 66 million years (Late Cretaceous) the huge Chicxulub impact crater, was found in the Pacific on an island 35 km from the coast of Colombia.

Gorgonilla - ground layers altered by the earthquake resulting of the impact to the fall of the meteorite at Chicxulub, more than 3,000 kilometers from the epicenter - photo Diario del Huila

Gorgonilla - ground layers altered by the earthquake resulting of the impact to the fall of the meteorite at Chicxulub, more than 3,000 kilometers from the epicenter - photo Diario del Huila

 Gorgonilla - Spherulites shaped in glassy drops - Doc. Diario del Huila

Gorgonilla - Spherulites shaped in glassy drops - Doc. Diario del Huila

The collision between the meteorite and our Earth caused a mega earthquake estimated of magnitude 13, that shook the Western Hemisphere, sprayed tons of rock that fell back to Europe, and caused a "nuclear winter", causing death of plants, followed in cascade of those of herbivores, and carnivores.

This is the first time we noted the presence of ashes related to this event in South America, what is more, in a state of great conservation after all these years ... probably related to the fact that the island of Gorgonilla has emerged only since a million of years.

Sources :

- Diario del Huila - Hallan en Gorgonilla fragmentos de meteorito que extinguió a los dinosaurios - link

- Sky Alert - Hallan rastros del meteorito relacionado con la extinción de los dinosaurios - link

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