|Erin dragging the GPR across the ice shelf.
|Myself and Christian enjoying a brew at a ApRes site.
|Digging in Geophones for Atsu's seismic work. He can just be seen at the end of this line of geophones about 400m away.
|Another benefit of drilling through the ice sheet,
you can dry your sock on the water heater.
There were two aspects to the science that TARSAN carried out; geophysics and the drilling/AMIGO. A variety of geophysical techniques were used to collect data on ice shelf properties over as much of the ice shelf as it was deemed safe to travel.
|A 300 metre hole through the ice sheet.
Ground Penetrating Radar (GPR) involved dragging a radar device along at a very steady speed to create a profile of ice thickness and properties. A number of different frequencies were used, in general the lower the frequency the deeper into the ice the radar looked. This was done on foot by one individual who dragged the radar a total of about 270km during the her time out in the field. It was found that the underside of the ice shelf was anything but flat with some interesting steps in ice thickness.
The final geophysics method used was active seismics. This involved digging long lines of geophones into the snow, and then detonating small buried explosive charge at the end of the geophone line. The geophones would record the echo of the explosion as it bounced of the base of the ice and the of the sea floor. From this the thickness of the ice and the depth of the ocean below can be calculated.
|Raising the AMIGO tower. Photo Karen Alley.
|The AMIGO tower with the camp in the background.