Analysis of 3-component OBS-data from the Campbell Plateau, New Zealand: A preliminary model


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jgrobys [ at ] awi-bremerhaven.de

Abstract

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.



Item Type
Conference (Poster)
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Not peer-reviewed
Publication Status
Published
Event Details
12th Workshop of the Commission on Controlled-Source Seismology, 7-11 Oct., Mountain Lake, VA, USA..
Eprint ID
9407
Cite as
Grobys, J. , Gohl, K. and Davy, B. (2003): Analysis of 3-component OBS-data from the Campbell Plateau, New Zealand: A preliminary model , 12th Workshop of the Commission on Controlled-Source Seismology, 7-11 Oct., Mountain Lake, VA, USA. .


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