@article{fdi:010073970,
  title = {{E}volution of the 2015 {C}otopaxi eruption revealed by combined geochemical and seismic observations},
  author = {{H}idalgo, {S}. and {B}attaglia, {J}. and {A}rellano, {S}. and {S}ierra, {D}. and {B}ernard, {B}. and {P}arra, {R}. and {K}elly, {P}. and {D}inger, {F}. and {B}arrington, {C}. and {S}amaniego, {P}ablo},
  editor = {},
  language = {{ENG}},
  abstract = {{T}hrough integration of multiple data streams to monitor volcanic unrest scientists are able to make more robust eruption forecast and to obtain a more holistic interpretation of volcanic systems. {W}e examined gas emission and gas geochemistry and seismic and petrologic data recorded during the 2015 unrest of {C}otopaxi ({E}cuador) in order to decipher the origin and temporal evolution of this eruption. {I}dentification of families of similar seismic events and the use of seismic amplitude ratios reveals temporal changes in volcanic processes. {SO}2 (300 to 24,000t/d), {B}r{O}/{SO}2 (5-10x10(-5)), {SO}2/{HC}l (5.84.8 and 6.63.0), and {CO}2/{SO}2 (0.6 to 2.1) measured throughout the eruption indicate a shallow magmatic source. {B}ulk ash and glass chemistry indicate a homogenous andesitic ({S}i{O}(2)wt%=56.940.25) magma having undergone extensive {S}-exsolution and degassing during ascent. {T}hese data lead us to interpret this eruption as a magma intrusion and ascend to shallow levels. {T}he intrusion progressively interacted with the hydrothermal system, boiled off water, and produced hydromagmatic explosions. {A} small volume of this intrusion continued to fragment and produced episodic ash emissions until it was sufficiently degassed and rheologically stiff. {B}ased on the 470kt of measured {SO}2 we estimate that similar to 65.3x10(6)m(3) of magma were required to supply the emitted gases. {T}his volume exceeds the volume of erupted juvenile material by a factor of 50. {T}his result emphasizes the importance of careful monitoring of {C}otopaxi to identify the intrusion of a new batch of magma, which could rejuvenate the nonerupted material.},
  keywords = {{C}otopaxi volcano ; volcano degassing ; volcano seismicity ; volcanic gas ; ratios ; preeruptive conditions ; preeruptive signals ; {EQUATEUR} ; {COTOPAXI} {VOLCAN} ; {CORDILLERA} {REAL}},
  booktitle = {},
  journal = {{G}eochemistry {G}eophysics {G}eosystems},
  volume = {19},
  numero = {7},
  pages = {2087--2108},
  ISSN = {1525-2027},
  year = {2018},
  DOI = {10.1029/2018gc007514},
  URL = {https://www.documentation.ird.fr/hor/fdi:010073970},
}