@article{PAR00009023,
  title = {{E}stimating rates of decompression from textures of erupted ash particles produced by 1999-2006 eruptions of {T}ungurahua volcano, {E}cuador},
  author = {{W}right, {H}. {M}. {N}. and {C}ashman, {K}. {V}. and {M}othes, {P}. {A}. and {H}all, {M}. {L}. and {R}uiz, {A}. {G}. and {L}e {P}ennec, {J}ean-{L}uc},
  editor = {},
  language = {{ENG}},
  abstract = {{P}ersistent low- to moderate-level eruptive activity of andesitic volcanoes is difficult to monitor because small changes in magma supply rates may cause abrupt transitions in eruptive style. {A}s direct measurement of magma supply is not possible, robust techniques for indirect measurements must be developed. {H}ere we demonstrate that crystal textures of ash particles from 1999 to 2006 {V}ulcanian and {S}trombolian eruptions of {T}ungurahua volcano, {E}cuador, provide quantitative information about the dynamics of magma ascent and eruption that is difficult to obtain from other monitoring approaches. {W}e show that the crystallinity of erupted ash particles is controlled by the magma supply rate ({MSR}); ash erupted during periods of high magma supply is substantially less crystalline than during periods of low magma supply. {T}his correlation is most easily explained by efficient degassing at very low pressures (<< 50 {MP}a) and degassing-driven crystallization controlled by the time available prior to eruption. {O}ur data also suggest that the observed transition from intermittent {V}ulcanian explosions at low {MSR} to more continuous periods of {S}trombolian eruptions and lava fountains at high {MSR} can be explained by the rise of bubbles through ({S}trombolian) or trapping of bubbles beneath ({V}ulcanian) vent-capping, variably viscous (and crystalline) magma.},
  keywords = {},
  booktitle = {},
  journal = {{G}eology},
  volume = {40},
  numero = {7},
  pages = {619--622},
  ISSN = {0091-7613},
  year = {2012},
  DOI = {10.1130/g32948.1},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00009023},
}