@article{fdi:010071923,
  title = {{E}vidences of surface rupture associated with a low-magnitude ({M}(w)5.0) shallow earthquake in the {E}cuadorian {A}ndes},
  author = {{C}hampenois, {J}. and {B}aize, {S}. and {V}all{\'e}e, {M}artin and {J}omard, {H}. and {A}lvarado, {A}. and {E}spin, {P}. and {E}kstom, {G}. and {A}udin, {L}aurence},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study analyzes surface displacements generated by a low-magnitude crustal earthquake in the {E}cuadorian {A}ndes by combining analysis of synthetic aperture radar ({SAR}) interferometry, geological field investigations, and seismological data. {I}n {M}arch 2010, a significant surface faulting event occurred in the {P}isayambo area ({E}astern {C}ordillera), along the major dextral fault zone bounding the {N}orth {A}ndean {S}liver and the {S}outh {A}merica {P}late. {I}nterferograms were inverted to determine fault plane geometry and slip displacement distribution. {T}he event affected a 9km long previously unknown fault, referred as the {L}aguna {P}isayambo {F}ault, with purely dextral movement reaching 45cm and concentrated in the top 3km of the crust. {G}eological investigations confirm both the fault mechanism and the amplitude of displacements. {W}hile these large displacements would be related to an event with a magnitude of 5.44 if using a standard crustal rigidity, we show that they can be convincingly associated with an {M}(w)5.0 earthquake, that occurred on 26 {M}arch 2010. {R}econciling the apparent differences in magnitude requires the existence of a low-rigidity medium at shallow depths and/or postseismic activity of the fault. {H}owever, considering only the latter hypothesis would imply an unusually active postseismic process, in which 400-500% of the coseismic moment is released in the 6days following the earthquake. {O}ur observations highlight that the scaling laws relating surface observations to earthquake magnitude, classically used for seismic hazard assessment, should be carefully used. {T}his study also illustrates how systematic {I}n{SAR} analysis, even in places where no clues of ground deformation are present, can reveal tectonic processes.},
  keywords = {{E}cuador ; {I}n{SAR} ; surface rutpure ; shallow earthquake ; {EQUATEUR} ; {ANDES}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {S}olid {E}arth},
  volume = {122},
  numero = {10},
  pages = {8446--8458},
  ISSN = {2169-9313},
  year = {2017},
  DOI = {10.1002/2017jb013928},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071923},
}