@article{PAR00019748,
  title = {{P}ost-emplacement dynamics of andesitic lava flows at {V}olcan de {C}olima, {M}exico, revealed by radar and optical remote sensing data},
  author = {{C}arrara, {A}. and {P}inel, {V}irginie and {B}ascou, {P}. and {C}haljub, {E}. and {D}e la {C}ruz-{R}eyna, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e used optical and radar remote sensing datasets to map, estimate the volume, and measure the surface displacements of lava flows emplaced on the flanks of {V}olcan de {C}olima, {M}exico by extrusion of lava dome material from the end of 2014 to early 2016. {O}ur main result is that the flow motion of the lava contributes significantly to the recorded displacements several months after its emplacement. {F}irst, we mapped the deposits and estimated their volumes using two {D}igital {E}levation {M}odels ({DEM}), one derived from radar data acquired before the peak of activity and one derived from optical images acquired just after this peak of activity. {C}oherence information derived from the radar dataset added some temporal constraints on the timing of emplacement of various deposits. {W}e thus estimated a mean extrusion rate of 1-2 m(3)s(-1) between {N}ovember 2014 and {F}ebruary 2015. {W}e then used a new approach to reconstruct the 3{D} displacement field, taking advantage of images acquired by the same satellite, on both ascending and descending tracks, and using a physical a priori on the direction of horizontal displacements. {O}ur results show that about 2 cm yr(-1) of horizontal motion is still recorded a few months after the emplacement on the {SW} lava flow, which is the only one covered by the two-acquisition geometries. {I}n order to differentiate the potential causes of the observed displacements, we modeled the thermal contraction of the lava flow using a finite element numerical method. {R}emoving the contribution of thermoelastic contraction from the measured displacements enable to infer both the viscoelastic loading and flow motion effects from the residuals. {R}esults show that, thermal contraction, flow motion and viscoelastic loading contribute significantly to the displacements recorded.},
  keywords = {{R}emote sensing ; {I}n{SAR} ; 3{D} displacement field ; {L}ava flow ; {S}ubsidence ; {T}hermal contraction ; {MEXIQUE} ; {COLIMA} {VOLCAN}},
  booktitle = {},
  journal = {{J}ournal of {V}olcanology and {G}eothermal {R}esearch},
  volume = {381},
  numero = {},
  pages = {1--15},
  ISSN = {0377-0273},
  year = {2019},
  DOI = {10.1016/j.jvolgeores.2019.05.019},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00019748},
}