@article{fdi:010079576,
  title = {{S}tructure of the {E}cuadorian forearc from the joint inversion of receiver functions and ambient noise surface waves},
  author = {{K}och, {C}. {D}. and {L}ynner, {C}. and {D}elph, {J}. and {B}eck, {S}. {L}. and {M}eltzer, {A}. and {F}ont, {Y}vonne and {S}oto-{C}ordero, {L}. and {H}oskins, {M}. and {S}tachnik, {J}. {C}. and {R}uiz, {M}. and {A}lvarado, {A}. and {A}gurto-{D}etzel, {H}. and {C}harvis, {P}hilippe and {R}{\'e}gnier, {M}arc and {R}ietbrock, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {E}cuadorian forearc is a complex region of accreted terranes with a history of large megathrust earthquakes. {M}ost recently, a {M}-w 7.8 megathrust earthquake ruptured the plate boundary offshore of {P}edernales, {E}cuador on 16 {A}pril 2016. {F}ollowing this event, an international collaboration arranged by the {I}nstituto {G}eofisico at the {E}scuela {P}olitecnica {N}acional mobilized a rapid deployment of 65 seismic instruments along the {E}cuadorian forearc. {W}e combine this new seismic data set with 14 permanent stations from the {E}cuadorian national network to better understand how variations in crustal structure relate to regional seismic hazards along the margin. {H}ere, we present receiver function adaptive common conversion point stacks and a shear velocity model derived from the joint inversion of receiver functions and surface wave dispersion data obtained through ambient noise cross-correlations for the upper 50 km of the forearc. {B}eneath the forearc crust, we observe an eastward dipping slow velocity anomaly we interpret as subducting oceanic crust, which shallows near the projected centre of the subducting {C}arnegie {R}idge. {W}e also observe a strong shallow positive conversion in the {E}cuadorian forearc near the {B}orbon {B}asin indicating a major discontinuity at a depth of similar to 7 km. {T}his conversion is not ubiquitous and may be the top of the accreted terranes. {W}e also observe significant north-south changes in shear wave velocity. {T}he velocity changes indicate variations in the accreted terranes and may indicate an increased amount of hydration beneath the {M}anabi {B}asin. {T}his change in structure also correlates geographically with the southern rupture limit of multiple high magnitude megathrust earthquakes. {T}he earthquake record along the {E}cuadorian trench shows that no event with a {M}-w >7.4 has ruptured south of similar to 0.5 degrees {S} in southern {E}cuador or northern {P}eru. {O}ur observations, along with previous studies, suggest that variations in the forearc crustal structure and subducting oceanic crust may influance the occurrence and spatial distribution of high magnitude seismicity in the region.},
  keywords = {{S}outh {A}merica ; {J}oint {I}nversion ; {C}rustal {I}maging ; {S}eismicity and tectonics ; {C}rustal {S}tructure ; {AMERIQUE} {DU} {SUD} ; {EQUATEUR}},
  booktitle = {},
  journal = {{G}eophysical {J}ournal {I}nternational},
  volume = {222},
  numero = {3},
  pages = {1671--1685},
  ISSN = {0956-540{X}},
  year = {2020},
  DOI = {10.1093/gji/ggaa237},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079576},
}