@article{fdi:010083753,
  title = {{D}eep structure of the southern {K}erguelen {P}lateau (southern {I}ndian {O}cean) from ocean bottom seismometer wide-angle seismic data},
  author = {{O}perto, {D}. and {C}harvis, {P}hilippe},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ide-angle seismic data collected during the {K}erguelen ocean bottom seismometer experiment provide the first images of the deep structure of the southern {K}erguelen {P}lateau and support a new interpretation of the origin of the plateau. {V}elocity models based on travel time inversions and reflectivity synthetic seismograms show a 22-km-thick crust composed of average 1.6 km of sedimentary cover, average 5.3 km of upper crust, average 11.0 km of lower crust, and a 4- to 6-km-thick reflective zone immediately above {M}oho. {V}elocities in the upper crust (from 3.8-4.5 km/s at top to 6.0-6.5 km/s at bottom) are consistent with the basaltic nature of this layer, the top of which was sampled during the {O}cean {D}rilling {P}rogram. {V}elocities in the lower crust increase continuously from 6.60 km/s at the top to 6.90 km/s at 19.5 km depth. {T}he reflective zone at the base of the crust identified by wide-angle reflections is observed only along the {NNW}-{SSE} direction. {I}t consists of alternating high- and low-velocity layers with an average velocity of 6.70 km/s in the {NNW}-{SSE} direction and ?6.90 km/s in the perpendicular direction. {S}trong azimuthal anisotropy is also observed in the upper mantle with velocities of 8.60 and 8.00 km/s, in the {NNW}-{SSE} and {E}-{W} directions, respectively. {T}he absence of high velocities at the base of the crust that characterizes many large-volume mafic provinces, the reflective lower crust, and anisotropy in upper mantle suggest that the southern {K}erguelen {P}lateau represents a stretched continental fragment overlain by basaltic flows isolated from the {A}ntarctic margin during the early opening of the {I}ndian {O}cean},
  keywords = {{KERGUELEN} ; {OCEAN} {INDIEN} ; {RAGGATT} {BASSIN}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {S}olid {E}arth},
  volume = {101},
  numero = {{B}11},
  pages = {25077--25103},
  ISSN = {2169-9313},
  year = {1996},
  DOI = {10.1029/96{JB}01758},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083753},
}