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Englacial seismic reflectivity: imaging crystal-orientation fabric in West Antarctica


Horgan, HJ and Anandakrishnan, S and Alley, RB and Burkett, PG and Peters, LE, Englacial seismic reflectivity: imaging crystal-orientation fabric in West Antarctica, Journal of Glaciology, 57, (204) pp. 639-650. ISSN 0022-1430 (2011) [Refereed Article]


Copyright Statement

Copyright 2011 International Glaciological Society.

DOI: doi:10.3189/002214311797409686


Abrupt changes in crystal-orientation fabric (COF), and therefore viscosity, are observed near the base of the ice sheet throughout West Antarctica. We report on active-source seismic observations from WAIS Divide, mid-stream and downstream on Thwaites Glacier, and the onset region of Bindschadler Ice Stream. These data reveal a prevalence of englacial seismic reflectivity in the bottom quarter of the ice sheet. The observed seismic reflectivity is complex but largely bed-conformable, with long-spatial-wavelength features observed in the flow direction and short-wavelength features observed across flow. A correspondence of englacial structures with bed features is also observed. We determine the origin of the reflectivity to be abrupt changes in the COF of ice, based on the following: (1) observations of englacial reflectivity are consistent with current knowledge of COF within ice sheets, (2) englacial reflectivity caused by COF contrasts requires the simplest genesis, especially at ice divides, and (3) amplitude analysis shows that the observed englacial reflectivity can be explained by contrasts in seismic velocity due to COF changes. We note that the downstream increase in the quantity and complexity of observations indicates that direct observations of COF at ice divides likely underestimate the role that fabric plays in ice-sheet dynamics.

Item Details

Item Type:Refereed Article
Keywords:crystal orientation fabric, ice dynamics, seismology
Research Division:Earth Sciences
Research Group:Physical geography and environmental geoscience
Research Field:Glaciology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)
UTAS Author:Peters, LE (Dr Leo Peters)
ID Code:103758
Year Published:2011
Web of Science® Times Cited:36
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-27
Last Modified:2017-10-30
Downloads:392 View Download Statistics

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