Airborne geophysical investigations of subglacial structure of West Antarctica ...

• Main Author: Jankowski, Edward Jan
• Format: Thesis
• Language: English
• Published: Apollo - University of Cambridge Repository 1981
• Subjects: Antarctic; Filchner Ice Shelf; West Antarctic Ice Sheet; West Antarctica; Antarc*; Antarctica; Ice Sheet; Ice Shelf
• Online Access: https://dx.doi.org/10.17863/cam.48060; https://www.repository.cam.ac.uk/handle/1810/300985

This thesis reviews the state of knowledge on geology, structure and tectonic evolution of West Antarctica. An airborne geophysical survey in West Antarctica comprising simultaneous Radio Echo Sounding (RES) and magnetics was carried out over -1 M km$^{2}$ of the ice covered area. The collection and reduction of large volumes of RES and magnetic data are described. The first detailed maps of ice sheet surface and bedrock topography were compiled from the RES data and are presented. The main characteristics of the West Antarctic ice sheet and its stability are briefly discussed including the grounding zone of the Ronne-Filchner Ice Shelf. Calculations for the depression of the crust by the weight of the overlying ice sheet are made and the bedrock topography isostatically adjusted. Detailed comparisons of magnetic profiles with the bedrock topography are made. Depth determinations on the magnetic profiles were performed and selected anomalies are modelled by computer to give quantitative estimates of bedrock ...