@article{fdi:010086790,
  title = {{U}nrest at {C}ayambe {V}olcano revealed by {SAR} imagery and seismic activity after the {P}edernales subduction earthquake, {E}cuador (2016)},
  author = {{B}edon, {P}. {A}. {E}. and {A}udin, {L}aurence and {D}oin, {M}. {P}. and {P}inel, {V}irginie and {P}athier, {E}. and {M}othes, {P}. and {G}arcia, {A} and {S}amaniego, {P}ablo and {P}acheco, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{F}or the first time in decades, a sudden increase in seismicity has been observed and monitored at {C}ayambe volcano in {E}cuador, in 2016. {T}his seismic unrest, which occurred a few months after the {A}pril 2016, {M}w 7.8 {P}edernales subduction earthquake, has raised many questions, especially as there is no record of recent eruptions at {C}ayambe volcano. {H}ere we analyze a time series of 104 images from {S}entinel 1 ({SAR}) data spanning the period 2014-2018 using the {NSBAS} processing chain in order to quantify surface deformation around this potentially explosive and ice-covered volcano. {W}e evidence a large-scale uplift reaching a maximum mean displacement rate of about 0.44 cm/yr in {L}ine of {S}ight. {T}his uplift is mainly due to a significant and sudden acceleration of the deformation pattern, focused on the {SE} flank starting in {N}ovember 2016. {W}e model this signal as related to magma emplacement at around 6 km depth below the summit, with a sudden volume influx of about 2.6 million m(3). {T}he inflation and surface deformation pattern is concomitant in time with two {M}w 3 seismic events recorded at {C}ayambe volcano in {N}ovember 2016 and is consistent with the location at the summit of the volcano-tectonic ({VT}) seismic swarm from {S}eptember 2016 onwards. {T}his {VT} swarm follows an earlier swarm in {J}une 2016 located on the northern side of the volcano and closer to a western branch of the {C}hingual-{C}osanga-{P}allatanga-{P}una ({CCPP}) fault system, that plays a major role in accommodating plate tectonic processes in {S}outh {A}merica. {W}e thus propose that static stress changes from the {P}edernales megathrust earthquake triggered magma ascent below the {C}ayambe volcano, through reactivation of the {CCPP} fault system. {F}inally, volcanic hazards around {C}ayambe ice-capped volcano, previously dormant for the last 300 years, should be reassessed in light of this recent unrest.},
  keywords = {{C}ayambe ; volcanic unrest ; {I}n{SAR} time series ; seismic swarm ; volcano-tectonic interactions ; {EQUATEUR}},
  booktitle = {},
  journal = {{J}ournal of {V}olcanology and {G}eothermal {R}esearch},
  volume = {428},
  numero = {},
  pages = {107577 [11 ]},
  ISSN = {0377-0273},
  year = {2022},
  DOI = {10.1016/j.jvolgeores.2022.107577},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086790},
}