@article{fdi:010072837,
  title = {{I}nversion of deformation fields time-series from optical images, and application to the long term kinematics of slow-moving landslides in {P}eru},
  author = {{B}ontemps, {N}. and {L}acroix, {P}ascal and {D}oin, {M}. {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}low-moving landslides are numerous in mountainous areas and pose a large threat to populations. {M}any observations show that their kinematics is driven by climatic forcings and earthquakes. {I}n this study, we document the complex interaction between those two forcings on the slow-moving landslide kinematics, based on the retrieval of landslide displacements over 28-years using optical satellite images. {T}o overcome the decorrelation effect over this large time-span, and possible misalignment between images, we develop a method that uses the redundancy of displacement fields from image pairs to derive a robust time-series of displacement. {T}he method is tested on the 28-year long {SPOT}1/5-{P}leiades archive, over an area in {P}eru affected by both earthquakes and rainfall. {E}rrors are estimated on stable areas and by comparison with one 13-year long and eleven 3-year long {GPS} time-series on the {M}aca landslide. {T}he methodology diminishes by up to 30% the uncertainty and reduces significantly the gaps due to decorrelation. {T}he data set allows detecting 3 major landslides, moving at a rate of 35 to 50 m over 28 years, and smaller landslides with lower displacement rates. {T}ime-series obtained over the three main landslides provide interesting results of their long-term kinematics, primarily driven by precipitation. {W}e propose simple statistical hydro-kinematic models, relating yearly motion to seasonal rainfall, to explain the observed time-series. {W}e found that annual precipitation is controlling the landslide displacements after a certain rainfall threshold is reached. {B}esides this control, we show the possible impact of a local {M}w 5.4 earthquake in 1991 on the kinematics of the {M}aca landslide. {O}ur results suggest that the earthquake accelerated the landslide and has an effect during several years on the precipitation threshold required for triggering a motion. {T}hese results suggest that the rainfall threshold can vary in time following strong earthquakes shaking.},
  keywords = {{L}andslides ; {T}ime-series ; {O}ptical satellites ; {L}ong term ; {P}eru ; {C}orrelation ; {PEROU}},
  booktitle = {},
  journal = {{R}emote {S}ensing of {E}nvironment},
  volume = {210},
  numero = {},
  pages = {144--158},
  ISSN = {0034-4257},
  year = {2018},
  DOI = {10.1016/j.rse.2018.02.023},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072837},
}