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Volcano Calendar 2019
: We're proud to present our 2019 volcano calendar: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.
: Depuis 2005, VolcanoDiscovery propose des voyages en petits groupes, des randonnées et du trekking, ainsi que des expéditions pour voir des volcans actuellement en activité, des voyages photographiques dans de nombreuses régions d’activité volcanique à travers le monde.
Livre Volcano Adventure Guide
: Excellente information et historique verser tous ceux qui veulent visiter les volcans actifs et agreable en toute curit. Le livre prentente des lignes directrices de la visite de 42 diff loue des volcans dans le monde entier.
: Places libres / : Départ garanti / : Quelques places disponibles / : Groupe fermé
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Glossaire illustré de la volcanologie
Un vent de fissure, également connu sous le nom une fissure volcanique ou simplement la fissure, est une cheminée volcanique linéaire à travers laquelle lave éclate.
A fissure vent, also known as a volcanic fissure or simply fissure, is a linear volcanic vent through which lava erupts, usually without any explosive activity. The vent is usually a few meters wide and may be many kilometers long. Fissure vents can cause large flood basalts and lava channels. This type of volcano is usually hard to recognize from the ground and from outer space because it has no central caldera and the surface is mostly flat. The volcano can usually be seen as a crack in the ground or on the ocean floor. Narrow fissures can be filled in with lava that hardens. As erosion removes its surroundings, the lava mass could stand above the surface as a dyke. The dykes that feed fissures reach the suface from depths of a few kilometers. Fissures are usually found in or along rifts and rift zones, such as Iceland and the Great Rift Valley in Africa.
In Iceland, volcanic vents are often long fissures parallel to the rift zone where lithospheric plates are diverging. Renewed eruptions generally occur from new parallel fractures offset by a few hundred to thousands of metres from the earlier fissures. This distribution of vents and voluminous eruptions of fluid basaltic lava usually build up a thick lava plateau rather than a single volcanic edifice. The Laki fissure system produced the biggest eruption on earth in historical times, in the form of a flood basalt, during the Eldgjá eruption A.D. 934, which released 19.6 km³ (4.7 mi³) of lava.
The radial fissure vents of Hawaiian volcanoes produce “curtains of fire” as lava fountains erupt along a portion of a fissure. These vents produce low ramparts of basaltic spatter on both sides of the fissure. More isolated lava fountains along the fissure produce crater rows of small spatter and cinder cones. The fragments that form a spatter cone are hot and plastic enough to weld together, while the fragments that form a cinder cone remain separate because of their lower temperature.
Plus sur VolcanoDiscovery:
Ubinas activity updates
: The most frequently active volcano in Peru entered a new eruptive phase in 2014. Updates and news are regularly posted on this page.
Vulkane Italiens - order online
: 88 pages, brilliant color photos, German language - this beautifully illustrated guidebook is a perfect introduction and companion for all interested in Italy's rich and varied volcanic areas.
Current activity of Bardarbunga volcano, Iceland
: An intense seismic crisis started at Bárdarbunga volcano on 16 August 2014 and is continuing at the time of writing (23 Aug). It may or may not lead to a volcanic eruption, possibly under the Vatnajökull ice cap.
Follow updates as news come in!