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Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica

Citation

Bassis, JN and Coleman, R and Fricker, HA and Minster, JB, Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica, Geophysical Research Letters, 32, (6) pp. L06502. ISSN 0094-8276 (2005) [Refereed Article]

DOI: doi:10.1029/2004GL022048

Abstract

We investigate ice shelf rift propagation using a combination of GPS and seismic measurements near the tip of an active rift in the Amery Ice Shelf. These measurements reveal that propagation occurs in episodic bursts, which were identified based on swarms of seismicity accompanied by rapid rift widening. The bursts last approximately 4 hours and are separated by 10-24 days. In between bursts, the rift widens at a rate comparable to that of ice shelf spreading. Comparison of automatic weather station data and tidal amplitudes show that the propagation bursts are not directly triggered by winds or tides, suggesting that rift propagation is driven by the background glaciological stress in the ice shelf. We show that the ice debris that partly fills the rift may play a role in controlling the rate of propagation. Copyright 2005 by the American Geophysical Union.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Social Impacts of Climate Change and Variability
Author:Coleman, R (Professor Richard Coleman)
ID Code:33000
Year Published:2005
Web of Science® Times Cited:31
Deposited By:Geography and Environmental Studies
Deposited On:2005-08-01
Last Modified:2011-10-06
Downloads:0

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