@article{fdi:010021656,
  title = {{S}patial distribution of hotspot material added to the lithosphere under {L}a {R}{\'e}union, from wide-angle seismic data},
  author = {{C}harvis, {P}hilippe and {L}aesanpura, {A}. and {G}allart, {J}. and {H}irn, {A}. and {L}{\'e}pine, {J}.{C}. and {D}e {V}oogd, {B}. and {M}inshull, {T}.{A}. and {H}ello, {Y}ann and {P}ontoise, {B}ernard},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ide-angle seismic lines recorded by ocean bottom and land seismometers provide a pseudo three dimensional investigation of the crust and upper mantle structure around the volcanically active hotspot island of {L}a {R}{\'e}union. {T}he submarine part of the edifice has fairly low seismic velocities, without evidence for intrusives. {A}n upper unit with a velocity-depth gradient is interpreted as made of material erupted subaerially then transported and compacted downslope. {B}etween this unit and the top of the oceanic plate, imaged by normal incidence seismic reflection, a more homogeneous unit indicated by shadow zones on several wide-angle sections may correspond to lavas of a different nature, extruded underwater in the earlier phase of volcanism. {C}oincident wide angle and normal incidence reflections document that the oceanic plate is not generally downwarping toward the island but doming instead toward its southeastern part, with limited evidence for some intracrustal intrusion. {D}eeper in the lithosphere, the presence of a layer of intermediate velocity between the crust and the mantle is firmly established. {I}t is interpreted as resulting from the advection of hotspot magmatic products. {P}ossibly partially molten, and of a composition for which the crust is a density barrier. {T}he extensive wide-angle coverage constrains the extent of this body. {I}t does not show the elongated shape expected from plate drift above a steady hotspot supply. {A}lternative propositions can hence be considered, for example, that {L}a {R}{\'e}union is caused by a solitary wave of hotspot material or by a young hotspot. {T}he size of the underplate, 140 km wide and up to 3 km thick, corresponds to less than half the volume of the edifice on top of the plate. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{POINT} {CHAUD} ; {LITHOSPHERE} ; {CROUTE} {OCEANIQUE} ; {FOND} {MARIN} ; {TOPOGRAPHIE} ; {SISMIQUE} {A} {REFLEXION} ; {PROFIL} {SISMIQUE} ; {SISMOGRAMME} ; {ILE} ; {VOLCAN} ; {ETUDE} {REGIONALE} ; {REUNION} ; {PITON} {DE} {LA} {FOURNAISE} {VOLCAN}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch},
  volume = {104},
  numero = {{B}2},
  pages = {2875--2893},
  ISSN = {0148-0227},
  year = {1999},
  DOI = {10.1029/98{JB}02841},
  URL = {https://www.documentation.ird.fr/hor/fdi:010021656},
}