@article{fdi:010086638,
  title = {{U}nrest at the {N}evados de {C}hillán volcanic complex : a failed or yet to unfold magmatic eruption ?},
  author = {{M}oussallam, {Y}. and {B}ani, {P}hilipson and {S}chipper, {C}.{I}. and {C}ardona, {C}. and {F}ranco, {L}. and {B}arnie, {T}. and {A}migo, {A}. and {C}urtis, {A}. and {P}eters, {N}. and {A}iuppa, {A}. and {G}iudice, {G}. and {O}ppenheimer, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}esuming erupting activity at volcanoes that have been long quiescent poses a significant challenge to hazard assessment, as it require assessment of whether the change in activity is an isolated event or the beginning of a new eruptive sequence. {S}uch inception is often poorly characterised as quiescent volcanoes tend to be poorly equipped and not extensively monitored, especially with respect to gas geochemistry. {H}ere, we report gas composition and flux measurements from a newly opened vent at the very onset of eruptive activity at the {N}evados de {C}hillán volcanic complex ({C}hile) in {J}anuary-{F}ebruary 2016. {T}he molar proportions of {H}2{O}, {CO}2, {SO}2, {H}2{S} and {H}2 gases are found to be 98.4, 0.97, 0.11, 0.01 and 0.5 mol% respectively. {T}he mean {SO}2 flux recorded in early {F}ebruary 2016 during periods of eruptive discharge amounts to 0.4-0.6 kg s-1. {O}ur results indicate that the new vent opening was propelled by magmatic gases, triggering repeated eruptions. {A}sh particles ejected by the first blast of 8 {J}anuary are dominated by lithic fragments of dacitic composition. {B}y contrast the ash ejected in a subsequent eruption contains both lithic fragments of dense dacite, and a fresher, sparsely vesicular material of basaltic andesite composition. {B}y {O}ctober 2017 the ejected ash is back to being dominated by the dense dacitic lithic material. {T}ogether with the seismic and deformation record, these observations point to the explosive activity resulting from a small intrusion of basaltic to andesitic magma at shallow level. {T}he fate of this magma, whether stalling or eventually triggering a magmatic eruption, remains to be seen, but current observations suggest the former is most likely.},
  keywords = {{CHILI} ; {ANDES} ; {NEVADOS} {DE} {CHILLAN}},
  booktitle = {},
  journal = {{V}olcanica},
  volume = {1},
  numero = {1},
  pages = {19--32},
  ISSN = {2610-3540},
  year = {2018},
  DOI = {10.30909/vol.01.01.1932},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086638},
}