@article{fdi:010032982,
  title = {{S}eismic structure of {C}ocos and {M}alpelo volcanic ridges and implications for hot spot-ridge interaction},
  author = {{S}allar{\`e}s, {V}alenti and {C}harvis, {P}hilippe and {F}lueh, {E}.{R}. and {B}ialas, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {C}ocos and {M}alpelo {V}olcanic {R}idges are blocks of thickened oceanic crust thought to be the result of the interaction between the {G}alapagos hot spot and the {C}ocos {N}azca {S}preading {C}enter during the last 20 m.y. {I}n this work we investigate the seismic structure of these two aseismic ridges along three wide angle transects acquired during the {P}anama basin and {G}alapagos plume {N}ew {I}nvestigations of {I}ntraplate magmatism ({PAGANINI}) 1999 experiment. {A} two dimensional velocity field with the {M}oho geometry is obtained using joint refraction/reflection travel time tomography, and the uncertainty and robustness of the results are estimated by performing a {M}onte {C}arlo type analysis. {O}ur results show that the maximum crustal thickness along these profiles ranges from 16.5 km (southern {C}ocos) to 19 km (northern {C}ocos and {M}alpelo). {O}ceanic layer 2 thickness is quite uniform regardless of total crustal thickness variations; crustal thickening is mainly accommodated by layer 3. {T}hese observations are shown to be consistent with gravity data. {T}he variation of layer 3 velocities is similar along all profiles, being lower where crust is thicker. {T}his leads to an overall anticorrelation between crustal thickness and bulk lower crustal velocity. {S}ince this anticorrelation is contrary to crustal thickening resulting from passive upwelling of abnormally hot mantle, it is necessary to consider active upwelling components and/or some compositional heterogeneities in the mantle source. {T}he {NW} limit of the {M}alpelo {R}idge shows a dramatic crustal thinning and displays high lower crustal velocities and a poorly defined crust mantle boundary, suggesting that differential motion along the {C}oiba transform fault probably separated {R}egina and {M}alpelo {R}idges.},
  keywords = {{VOLCANISME} ; {POINT} {CHAUD} ; {TOMOGRAPHIE} ; {SISMOTECTONIQUE} ; {CROUTE} {OCEANIQUE} ; {GEODYNAMIQUE} ; {COLON} {ARCHIPIELAGO} ; {COCOS} ; {MALPELO}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch},
  volume = {108},
  numero = {{B}12},
  pages = {5--1--5--21},
  ISSN = {0148-0227},
  year = {2003},
  DOI = {10.1029/2003{JB}002431},
  URL = {https://www.documentation.ird.fr/hor/fdi:010032982},
}