@article{fdi:010049182, title = {{R}emarkable geochemical changes and degassing at {V}oui crater lake, {A}mbae volcano, {V}anuatu}, author = {{B}ani, {P}hilipson and {O}ppenheimer, {C}. and {V}arekamp, {J}. {C}. and {Q}uinou, {T}. and {L}ardy, {M}ichel and {C}arn, {S}.}, editor = {}, language = {{ENG}}, abstract = {{A}mbae (also known as {A}oba), is a 38 x 16 km(2) lozenge-shaped island volcano with a coastal population of around 10000. {A}t the summit of the volcano is lake {V}oui - one of the largest active crater lakes worldwide, with 40 x 10(6)m(3) of acidic water perched 1400 mas.l. {A}fter more than 300 years of dormancy, {A}mbae volcano reawakened with phreatic eruptions through {V}oui 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. {I}ntegrating lake water chemistry with new measurements of {SO}2 emissions from the volcano during the 2005-2006 eruptive period helps to explain the unusual and spectacular volcanic activity of {A}mbae - initially, a degassed magma approached the lake bed and triggered the surtseyan eruption. {D}epressurization of the conduit facilitated ascent of volatile-rich magma from the deeper plumbing system. {T}he 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.}, keywords = {{A}mbae volcano ; {L}ake {V}oui ; crater lake colour change ; geochemistry ; {SO}2 ; emissions}, booktitle = {}, journal = {{J}ournal of {V}olcanology and {G}eothermal {R}esearch}, volume = {188}, numero = {4}, pages = {347--357}, ISSN = {0377-0273}, year = {2009}, DOI = {10.1016/j.jvolgeores.2009.09.018}, URL = {https://www.documentation.ird.fr/hor/fdi:010049182}, }