@article{fdi:010091990,
  title = {{I}nternal deformation of the {N}orth {A}ndean {S}liver in {E}cuador and southern {C}olombia observed by {I}n{SAR}},
  author = {{M}arconato, {L}. and {A}udin, {L}aurence and {D}oin, {M}. {P}. and {N}ocquet, {J}ean-{M}athieu and {J}arrin, {P}. and {R}olandone, {F}. and {H}arrichhausen, {N}. and {M}othes, {P}. and {M}ora-{P}áez, {H}. and {C}isneros, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the northern {A}ndes, partitioning of oblique subduction of the {N}azca plate beneath the {S}outh {A}merican continent induces a northeastward motion of the {N}orth {A}ndean {S}liver. {T}he strain resulting from this motion is absorbed by crustal faults, which have produced magnitude 7+ earthquakes historically in the {A}ndean {C}ordillera of {E}cuador and southern {C}olombia. {I}n order to quantify the strain in that area, we derive a high-resolution surface velocity map using {I}n{SAR} time-series processing. {W}e analyzed 6-8 yr of {S}entinel-1 data and combined different satellite line-of-sight directions to produce a reliable velocity map in the east direction. {W}e use interpolated {GNSS} data to express the velocity map with respect to {S}table {S}outh {A}merica and remove the long-wavelength pattern due to the postseismic deformation following the 2016 {M}-w 7.8 {P}edernales earthquake. {T}he {I}n{SAR} velocity map finds high east-west shortening strain rates along north-south trending structures within the {W}estern {C}ordillera and the {I}nterandean valley, with little deformation taking place east of them. {T}his result strengthens the previous proposition of a similar to 350 km long {Q}uito-{L}atacunga tectonic block, forming a restraining bend in the overall right-lateral strike-slip fault system accommodating the northeastward escape motion of the {N}orth {A}ndean {S}liver. {H}owever, the high spatial resolution provided by {I}n{SAR} indicates that previously proposed boundaries for this block need to be revised. {I}n particular, {I}n{SAR} results highlight high strain rates (>300 nstrain yr(-1)) along undescribed active structures, south and west of the proposed limits for the {Q}uito-{L}atacunga block, respectively, in {P}eltetec and {I}barra regions. {I}nterestingly, the two areas with the largest strain rates spatially correlate with the proposed areas of large historical earthquakes. {M}odeling of the {I}n{SAR} and {GNSS} velocities in these areas suggests shallow coupling and high slip rates on structures which, previously, were not identified as active. {W}e also demonstrate a slow-down of the shallow aseismic slip on the {Q}uito fault after the {P}edernales earthquake, suggesting that stress changes following large megathrust events might trigger transient slip behaviors on crustal faults. {T}he high-resolution strain map provided by this work provides a new basis for future tectonic models in the {E}cuadorian and southern {C}olombian {A}ndes, and will contribute to the seismic hazard assessment in this highly populated area of the {A}ndes.},
  keywords = {{R}adar interferometry ; {S}atellite {G}eodesy ; {S}outh {A}merica ; {T}ime-series analysis ; {E}arthquake hazards ; {C}ontinental neotectonics ; {EQUATEUR} ; {COLOMBIE} ; {ANDES}},
  booktitle = {},
  journal = {{G}eophysical {J}ournal {I}nternational},
  volume = {239},
  numero = {3},
  pages = {1557--1575},
  ISSN = {0956-540{X}},
  year = {2024},
  DOI = {10.1093/gji/ggae338},
  URL = {https://www.documentation.ird.fr/hor/fdi:010091990},
}