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LIMPICS Antarctica 2009/10

Jan./Feb. 2010: Halvfarryggen, Dronning Maud Land, Antarctica

71°10’ S / 6°45’ E

Start of traverse and test measurements at Neumayer III

The expedition aims at performing a seismic reflection survey from the surface at the Halvfarryggen ice dome, a candidate for the upcoming IPICS 2k/40k ice cores. At ice domes the internal structure imaged with radar data often indicates upwarping internal layers, so-called isochrone arches or Raymond bumps. Modelling studies indicate that the crystal orientation fabric (COF) at larger depths at ice domes should be highly anisotropic. As changes in COF also change the impedance contrast such changes should be detectable with seismic methods. Scientific goals therefore are to detect internal seismic reflection horizons, which will later be compared to radar reflection horizons, along two perpendicular profiles across the ice dome, detect the ice-bed interface and image the upper tens of meters of the underlying bedrock. In addition to these scientific goals the expedition will employ improved drilling devices and new techniques for seismic data acquisition, such as a conventional vibroseis truck, in preparation for a similar study at Kohnen station in following field seasons.

First results indicate that