Ground Penetrating Radar

For mapping glacier flow structures and the glacier-bedrock interface a 'GSSI SIR 3000 and GSSI SIR 10 A were used with a maximum time window of 8,000 and 10,000 ns, respectively. A 35MHz antennae-pair (Bistatic Radarteam SE-40), a 200MHz antennae-pair, and a single 500MHz antenna are pulled by a Nansen Sledge, which carries the control units. A Trimble 5700 differential, kinematic GPS, provides absolute positioning of the GPR data and allows survey of the glacier surface topography. GPR and GPS measurements are taken in kinematic mode.

Fig. 7: Photo showing Nansen sledge carrying GPR and crevasse rescue equipment