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Vibrations of Mertz Glacier ice tongue, East Antarctica

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Lescarmontier, L and Legresy, B and Coleman, R and Perosanz, F and Mayet, C and Testut, L (2012) Vibrations of Mertz Glacier ice tongue, East Antarctica. Journal of Glaciology, 58 (210). pp. 665-676. ISSN 0022-1430

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Abstract

At the time of its calving in February 2010, Mertz Glacier, East Antarctica, was
characterized by a 145km long, 35km wide floating tongue. In this paper, we use GPS data from the
Collaborative Research into Antarctic Calving and Iceberg Evolution (CRAC-ICE) 2007/08 and 2009/10
field seasons to investigate the dynamics of Mertz Glacier. Twomonths of data were collected at the end
of the 2007/08 field season from two kinematic GPS stations situated on each side of the main rift of the
glacier tongue and from rock stations located around the ice tongue during 2008/09. Using Precise Point
Positioning with integer ambiguity fixing, we observe that the two GPS stations recorded vibrations of
the ice tongue with several dominant periods. We compare these results with a simple elastic model of
the ice tongue and find that the natural vibration frequencies are similar to those observed. This
information provides a better understanding of their possible effects on rift propagation and hence on
the glacier calving processes.

Item Type: Article
Journal or Publication Title: Journal of Glaciology
Page Range: pp. 665-676
ISSN: 0022-1430
Identification Number - DOI: 10.3189/2012JoG11J089
Additional Information:

Copyright 2012 IGS

Date Deposited: 19 Mar 2013 00:54
Last Modified: 18 Nov 2014 04:49
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