Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica
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 wid...
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Online Access: | https://doi.org/10.1029/2004GL022048 http://ecite.utas.edu.au/33000 |
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ftunivtasecite:oai:ecite.utas.edu.au:33000 2023-05-15T13:22:00+02:00 Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica Bassis, JN Coleman, R Fricker, HA Minster, JB 2005 https://doi.org/10.1029/2004GL022048 http://ecite.utas.edu.au/33000 en eng American Geophysical Union http://dx.doi.org/10.1029/2004GL022048 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] http://ecite.utas.edu.au/33000 Earth Sciences Physical Geography and Environmental Geoscience Glaciology Refereed Article PeerReviewed 2005 ftunivtasecite https://doi.org/10.1029/2004GL022048 2019-12-13T21:12:06Z 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. Article in Journal/Newspaper Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf eCite UTAS (University of Tasmania) Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) East Antarctica Geophysical Research Letters 32 6 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
spellingShingle |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology Bassis, JN Coleman, R Fricker, HA Minster, JB Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica |
topic_facet |
Earth Sciences Physical Geography and Environmental Geoscience Glaciology |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Bassis, JN Coleman, R Fricker, HA Minster, JB |
author_facet |
Bassis, JN Coleman, R Fricker, HA Minster, JB |
author_sort |
Bassis, JN |
title |
Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica |
title_short |
Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica |
title_full |
Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica |
title_fullStr |
Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica |
title_full_unstemmed |
Episodic propagation of a rift on the Amery Ice Shelf, East Antarctica |
title_sort |
episodic propagation of a rift on the amery ice shelf, east antarctica |
publisher |
American Geophysical Union |
publishDate |
2005 |
url |
https://doi.org/10.1029/2004GL022048 http://ecite.utas.edu.au/33000 |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Amery Amery Ice Shelf East Antarctica |
geographic_facet |
Amery Amery Ice Shelf East Antarctica |
genre |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf |
genre_facet |
Amery Ice Shelf Antarc* Antarctica East Antarctica Ice Shelf |
op_relation |
http://dx.doi.org/10.1029/2004GL022048 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] http://ecite.utas.edu.au/33000 |
op_doi |
https://doi.org/10.1029/2004GL022048 |
container_title |
Geophysical Research Letters |
container_volume |
32 |
container_issue |
6 |
_version_ |
1766362737165729792 |