@article{fdi:010047177,
  title = {{J}oint inversion of multichannel seismic reflection and wide-angle seismic data : improved imaging and refined velocity model of the crustal structure of the north {E}cuador-south {C}olombia convergent margin},
  author = {{A}gudelo, {W}illiam and {R}ibodetti, {A}lessandra and {C}ollot, {J}ean-{Y}ves and {O}perto, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}mproving seismic imaging of the crust is essential for understanding the structural factors controlling subduction zones processes. {W}e developed a processing work flow based on the combined analysis of multichannel seismic reflection ({MCS}) and wide angle ({WA}) reflection/refraction data to derive both shallow and deep velocities suitable for prestack depth migration and to construct a blocky velocity model integrating all identifiable seismic phases contained in {MCS} and {WA} data. {W}e apply this strategy to the study of the north {E}cuador-{SW} {C}olombia subduction margin to improve the imaging and geostructural interpretation of a splay fault and surrounding outer and inner margin wedges. {R}esults show improvements over tomographic inversion of {WA} data only, such as (1) sediment velocity variation across the trench and margin slope that correlates with lateral lithologic changes, tectonic compaction and effect of mass wasting processes; (2) a two-layer velocity structure of the inner wedge basement that is consistent with the crust of an oceanic plateau; (3) a complex velocity structure of the outer wedge basement that consists of a deep, high-velocity (5.0-5.5 km s(-1)) core and a low-velocity zone (3.8-5.0 km s(-1)) associated with the major splay fault; (4) a similar to 1.3-km-thick, low-velocity (3.5-4.0 km s(-1)) subduction channel that extends beneath the margin outer wedge. {B}oth the splay fault and subduction channel are expected to direct fluid flows; and (5) downdip velocity increase (5-6 km s(-1)) in the subducting oceanic crust associated with a low (7.8 km s(-1)) upper mantle velocity, possibly reflecting changes in rock nature or properties.},
  keywords = {{ANDES} ; {EQUATEUR} ; {COLOMBIE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch - {S}olid {E}arth},
  volume = {114},
  numero = {},
  pages = {{B}02306},
  ISSN = {0148-0227},
  year = {2009},
  DOI = {10.1029/2008jb005690},
  URL = {https://www.documentation.ird.fr/hor/fdi:010047177},
}