HR: 0800h
AN: T11A-1240    [Abstracts]
TI: Geologic framework for the East Antarctic Ice Sheet: Geophysical Constraints
AU: * Winberry, P
EM: winberry@essc.psu.edu
AF: Penn State University, Department of Geosciences, University Park, PA 16802 United States
AU: Anandakrishnan, S
EM: sak@essc.psu.edu
AF: Penn State University, Department of Geosciences, University Park, PA 16802 United States
AB: Recent geophysical studies of the West Antarctic Ice Sheet have demonstrated that regional geology plays a dominant role in controlling the dynamics of ice sheet motion. However, understanding of the geologic setting for the East Antarctic Ice Sheet remains limited. Recently acquired geophysical data (ice penetrating radar, seismic, gravity, magnetic, surface elevation) in the region of the Wilkes subglacial basin provides new insights into the sub-ice conditions, allowing us to better address the influence of the subglacial geology on ice flow in East Antarctica. In particular we look at the ice dynamics associated with sedimentary basins, as determined by seismic and gravity data, as well as the role of water-saturated sediments as inferred by radar amplitude analysis. In addition, we couple these constraints on subglacial conditions with observations of large-scale englacial structures to better characterize ice flow in the region.
DE: 8107 Continental neotectonics
DE: 1827 Glaciology (1863)
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting