Publications des scientifiques de l'IRD

Bani Philipson, Oppenheimer C., Varekamp J. C., Quinou T., Lardy Michel, Carn S. (2009). Remarkable geochemical changes and degassing at Voui crater lake, Ambae volcano, Vanuatu. Journal of Volcanology and Geothermal Research, 188 (4), p. 347-357. ISSN 0377-0273.

Titre du document
Remarkable geochemical changes and degassing at Voui crater lake, Ambae volcano, Vanuatu
Année de publication
2009
Type de document
Article référencé dans le Web of Science WOS:000273153700004
Auteurs
Bani Philipson, Oppenheimer C., Varekamp J. C., Quinou T., Lardy Michel, Carn S.
Source
Journal of Volcanology and Geothermal Research, 2009, 188 (4), p. 347-357 ISSN 0377-0273
Ambae (also known as Aoba), is a 38 x 16 km(2) lozenge-shaped island volcano with a coastal population of around 10000. At the summit of the volcano is lake Voui - one of the largest active crater lakes worldwide, with 40 x 10(6)m(3) of acidic water perched 1400 mas.l. After more than 300 years of dormancy, Ambae volcano reawakened with phreatic eruptions through Voui in 1995, and culminating in a series of surtseyan eruptions in 2005, followed by a rapid and spectacular colour change of the lake from light blue to red in 2006. Integrating lake water chemistry with new measurements of SO2 emissions from the volcano during the 2005-2006 eruptive period helps to explain the unusual and spectacular volcanic activity of Ambae - initially, a degassed magma approached the lake bed and triggered the surtseyan eruption. Depressurization of the conduit facilitated ascent of volatile-rich magma from the deeper plumbing system. The construction of a cone during eruption and the high degassing destabilised the equilibrium of lake stratification leading to a limnic event and subsequently the spectacular colour change.
Plan de classement
Géophysique interne [066]
Localisation
Fonds IRD [F B010049182]
Identifiant IRD
fdi:010049182
Contact