@article{fdi:010053082,
  title = {{T}he challenging retrieval of the displacement field from {I}n{SAR} data for andesitic stratovolcanoes : case study of {P}opocatepetl and {C}olima {V}olcano, {M}exico},
  author = {{P}inel, {V}irginie and {H}ooper, {A}. and {D}e la {C}ruz-{R}eyna, {S}. and {R}eyes-{D}avila, {G}. and {D}oin, {M}.{P}. and {B}ascou, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{D}espite the ability of synthetic aperture radar ({SAR}) interferometry to measure ground motion with high-resolution, application of this remote sensing technique to monitor andesitic stratovolcanoes remains limited. {S}pecific acquisition conditions characterizing andesitic stratovolcanoes, mainly vegetated areas with large elevation ranges, induce low signal coherence as well as strong tropospheric artefacts that result in small signal-to-noise ratio. {W}e propose here a way to mitigate these difficulties and improve the {SAR} measurements. {W}e derive ground motions for two of the most active {M}exican stratovolcanoes: {P}opocatepetl and {C}olima {V}olcano, from the time series of {SAR} data acquired from {D}ecember 2002 to {A}ugust 2006. {T}he {SAR} data are processed using a method that combines both persistent scatterers and small baseline approaches. {S}tratified tropospheric delays are estimated for each interferogram using inputs from the global atmospheric model {NARR}, up to a maximum of 10 rad/km. {T}hese delays are validated using spectrometer data, as well as the correlation between the wrapped phase and the elevation. {T}he tropospheric effect is removed from the wrapped phase in order to improve the unwrapping process. {O}n {P}opocatepetl, we observe no significant deformation. {T}he {C}olima summit area exhibits a constant subsidence rate of more than 1 cm/year centered on the summit but enhanced (reaching more than 2 cm/year) around the 1998 lava flow. {W}e model this subsidence considering both a deflating magma source at depth and the effect of the eruptive deposits load.},
  keywords = {andesitic stratovolcanoes ; deformation ; {I}n{SAR} time series ; stratified ; tropospheric artefacts},
  booktitle = {},
  journal = {{J}ournal of {V}olcanology and {G}eothermal {R}esearch},
  volume = {200},
  numero = {1-2},
  pages = {49--61},
  ISSN = {0377-0273},
  year = {2011},
  DOI = {10.1016/j.jvolgeores.2010.12.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053082},
}