The Campbell-Plateau is a large submarine continental plateau lying to the southeastof New Zealand and separated from the landmass of New Zealand by a series ofdeep extensional sedimentary basins and geomorphologic deeps. The region (withNew Zealand) formed a part of Gondwana until extension and subsequent seafloorspreading formed the Southern Ocean at about 82 Ma. Although the timing of break-upis well defined, the processes of break-up and the development of the continentalfragment forming Campbell Plateau are not yet understood. To investigate theprocesses of evolution of submarine plateaux, a geophysical survey was conductedacross the Campbell Plateau in January and February 2003. The survey carried out aseismic (OBS) transect with a high density of OBSs (spacing ~ 10 - 20km) incombination with a series of crustal seismic reflection lines. It crossed the GreatSouth Basin and poorly known east-west trending inferred extensional basins on theCampbell Plateau and in the Bounty Trough. The large number of multicomponentOBS recordings enabled us to set up a densely spaced model based oncompressional as well as shear waves, which provides the possibility to revealinformation about lithologic properties as Poisson ratios. A preliminary model ofCampbell Plateau and Bounty Trough, based on travel-time inversion will bepresented here.