@article{fdi:010066030,
  title = {{S}eamount subduction at the {N}orth-{E}cuadorian convergent margin : effects on structures, inter-seismic coupling and seismogenesis},
  author = {{M}arcaillou, {B}oris and {C}ollot, {J}ean-{Y}ves and {R}ibodetti, {A}lessandra and d'{A}cremont, {E}. and {M}ahamat, {A}. {A}. and {A}lvarado, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}t the {N}orth-{E}cuadorian convergent margin (1 degrees {S}-1.5 degrees {N}), the subduction of the rough {N}azca oceanic plate leads to tectonic erosion of the upper plate and complex seismogenic behavior of the megathrust. {W}e used three selected pre-stack depth migrated, multi-channel seismic reflection lines collected during the {SISTEUR} cruise to investigate the margin structure and decipher the impact of the subducted {A}tacames seamounts on tectonic erosion, interseismic coupling, and seismogenesis in the region of the 1942 {M}w7.8 earthquake. {T}his dataset highlights a subducted similar to 30 x 40 km, double-peak seamount that belongs to the {A}tacames seamount chain and that is associated with a deep morphologic re-entrant containing mass transport deposits. {T}he seamount subduction uplifted the margin basement by similar to 1.6 km and pervasively broke the margin by deep and intense reverse faulting ahead of the seamount, a process that is likely to weaken considerably the margin. {I}n the seamount wake, the basement reverse fault system rotated counter-clockwise. {T}his faulted basement is overlain with slope sediment sliding along listric normal faults that sole out onto the {BSR}. {T}his superposition of deep tectonic contraction within the basement and shallow gravitational extension deformation within the sediment highlights the key role of gas hydrate on outer slope erosion. {I}n addition to long-term regional basal erosion, the margin basement has thinned locally by an extra 0.8-1 km in response to the subduction of the {A}tacames seamount chain and hydrofracturing by overpressured fluids at the margin toe. {T}his pervasively and deeply fractured margin segment is associated with a seismically quiet and {GPS}-modeled low interseismic coupling corridor that terminates downdip near the 1942 epicenter and locked zone. {W}e suggest that the deeply buried double-peak {A}tacames seamount triggered the 1942 earthquake ahead of its leading flank. {T}his result supports previous studies proposing that subducted seamounts provide unfavorable conditions for locking the updip segment of the plate boundary limiting the updip extent of seismogenic zones, but may favor large subduction earthquakes at greater depths.},
  keywords = {subduction zone structure ; convergent margin tectonic deformation ; subducted seamount ; seismogenic zone ; subduction earthquakes ; {E}cuador ; margin ; {EQUATEUR} ; {PACIFIQUE} / {CARNEGIE} {CORDILLERE}},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {433},
  numero = {},
  pages = {146--158},
  ISSN = {0012-821{X}},
  year = {2016},
  DOI = {10.1016/j.epsl.2015.10.043},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066030},
}