@article{fdi:010062035,
  title = {{T}hree-dimensional velocity structure of the outer fore arc of the {C}olombia-{E}cuador subduction zone and implications for the 1958 megathrust earthquake rupture zone},
  author = {{G}arcia {C}ano, {L}. {C}. and {G}alve, {A}. and {C}harvis, {P}hilippe and {M}arcaillou, {B}oris},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n 2005, an onshore, offshore 3-{D} refraction and wide-angle reflection seismic experiment was conducted along the convergent margin at the border between {C}olombia and {E}cuador, over the rupture zone of the 1958, {M}-w 7.6 subduction earthquake. {A} well-defined {V}p velocity model of the plate boundary and upper and lower plates was constructed, down to 25 km depth, using first arrival traveltimes inversion. {T}he model reveals a several kilometers thick, low-velocity zone in the upper plate, located immediately above the interplate contact. {T}his low-velocity zone might be related to alteration and fracturing of the mafic and ultramafic rocks, which composed the upper plate in this area by fluids released by the lower plate with possible contributions from sediment underplating. {N}ear the toe of the margin, the model shows a low-velocity gradient in the outer wedge, which is interpreted as highly faulted and fractured rocks. {T}his low-velocity/low-gradient region appears to limit the oceanward extension of the rupture zones of the 1958 and 1979 earthquakes, possibly because coseismic deformation and uplift of the outer margin wedge dissipates most of the seismic energy.},
  keywords = {{S}outh {A}merica ; tomography ; great earthquakes ; subduction ; crustal structure ; {COLOMBIE} ; {EQUATEUR}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch.{S}olid {E}arth},
  volume = {119},
  numero = {2},
  pages = {1041--1060},
  ISSN = {2169-9313},
  year = {2014},
  DOI = {10.1002/2012jb009978},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062035},
}