Abstract
Bathymetric, sidescan sonar, and high-resolution seismic data indicate that the shelf off Mac. Robertson Land, East Antarctica is deeply eroded by glaciers and currents. Basement is exposed over wide areas. Data available include MCS and 3.5 kHz obtained by Stagg (1985) in 1982 (see O’Brien et al, this volume, for details). In 1995 R.V. Aurora Australis collected bathymetric data using a Simrad EA200 12.5 KHz echo sounder and seismic data were obtained using a Seismic Systems Inc. generator-injector (GI) gun (150 cubic inches) with 4 groups (4 channels) of ten hydrophones. Analogue (uncorrected) sidescan sonar data were recorded using an EG&G 960 tow fish and an EG&G 996 digital modem connected to an EPS 9800 graphic recorder. The sidescan sonar was operated at ranges of 375 to 500 m.
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