@article{fdi:010021654,
  title = {{P}erturbation to the lithosphere along the hotspot track of {L}a {R}{\'e}union from an offshore-onshore seismic transect},
  author = {{G}allart, {J}. and {D}riad, {L}. and {C}harvis, {P}hilippe and {S}apin, {M}. and {H}irn, {A}. and {D}iaz, {J}. and {V}oogd, {B}. de and {S}achpazi, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} 250 km long {NE}-{SW} lithospheric transect spanning the 40 km wide island of {L}a {R}{\'e}union and its submarine edifice is derived from lines of air gun shots at sea on either side, along the assumed hotspot trace. {S}eismic records were obtained from an array spanning the whole transect and including sea bottom and land receivers, providing a system of reversed and overlapping observations. {L}ow seismic velocity, and hence density, is found on average for the whole edifice above the oceanic plate. {W}e attribute high-velocity anomalies within the edifice to an intrusive core confined under the central northern quarter of the island-crossing segment. {U}nexpectedly, the main seismic interfaces, top and bottom of the prevolcanic crust, do not show significant flexural downwarping under the island. {I}n addition, clear multipathing in the recorded wave field requires the presence of a body with a seismic velocity intermediate between the prevolcanic crustal material and the normal mantle. {T}his lithospheric structure provides the first example where underplating occurs beneath an active volcanic island, suggesting a genetic relationship. {T}he underplated body could represent residues of the evolution of primary picritic melts that yield erupted basalts. {E}vidence for reflectors deeper in the lithosphere may indicate further related heterogeneity. {I}n the plate/hotspot model commonly assumed, the structural variation along the transect could be interpreted as a variation with time of the amount and physical state of underplated material. ({R}{\'e}sum{\'e} d'auteur)},
  keywords = {{VOLCANISME} ; {POINT} {CHAUD} ; {LITHOSPHERE} ; {MANTEAU} ; {SISMOGRAMME} ; {PROFIL} {SISMIQUE} ; {GEOLOGIE} {STRUCTURALE} ; {INVERSION} ; {MODELISATION} ; {REUNION} ; {PITON} {DE} {LA} {FOURNAISE} {VOLCAN}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch},
  volume = {104},
  numero = {{B}2},
  pages = {2895--2908},
  ISSN = {0148-0227},
  year = {1999},
  DOI = {10.1029/98{JB}02840},
  URL = {https://www.documentation.ird.fr/hor/fdi:010021654},
}