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Victoria University Antarctic Research Expedition Science and Logistics Reports 1984-85: VUWAE 29

Results

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Results

The high resolution antennae picked up many reflecting layers within the ice but were unable to find the ice/rock interface (Figure 19 shows a photograph of a high resolution record). Crevasses produced diffraction patterns in the upper part of the record which masked some of the layers. This was only a problem in the first 4 kilometres of the A-A′ profile. Beyond this, we could see down to about 7 microseconds (two-way travel-time) or approximately 600 m. The base was not visible.

On the Mt Melbourne side of the A-A′ profile, the base appeared as a strong reflection, at a depth of about 1100 m and rose rapidly to the order of 10 m on the A-A′ profile. Using undamped antennae we were able to penetrate down to 1200 m. He found that the base was only visible continuously near the edges of the glacier. An example of an undamped record is seen in Figure 20.

A change in the nature of the reflector at 800 m is indicated by the quality of the reflections which was excellent above that depth and poor below.

Figure 17. Block diagram of R.E.S. equipment.

Figure 17. Block diagram of R.E.S. equipment.

Figure 18. Plan view of the R.E.S. equipment mounted on skidoo and sledges.

Figure 18. Plan view of the R.E.S. equipment mounted on skidoo and sledges.

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