Strain rate distribution on an active ice shelf rift derived by GPS
The majority of mass lost from the Antarctic ice sheet takes place at the fringing ice shelves via iceberg calving. Iceberg calving is controlled by the initiation and propagation of large scale rifts (fractures that penetrate through the entire ice shelf thickness), which precede large tabular iceb...
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ftunivtasmania:oai:eprints.utas.edu.au:5273 2023-05-15T13:22:07+02:00 Strain rate distribution on an active ice shelf rift derived by GPS Janssen, V Coleman, R 2007-12 application/pdf https://eprints.utas.edu.au/5273/ https://eprints.utas.edu.au/5273/1/AGU2007_JanssenColeman_abstract.pdf https://eprints.utas.edu.au/5273/3/AGU2007_JanssenColeman_poster.pdf http://www.agu.org/meetings/fm07/ en eng https://eprints.utas.edu.au/5273/1/AGU2007_JanssenColeman_abstract.pdf https://eprints.utas.edu.au/5273/3/AGU2007_JanssenColeman_poster.pdf Janssen, V and Coleman, R 2007 , 'Strain rate distribution on an active ice shelf rift derived by GPS', paper presented at the 2007 AGU Fall Meeting, December 10-14, San Francisco. cc_utas 291001 Geodesy Conference or Workshop Item PeerReviewed 2007 ftunivtasmania 2020-05-30T07:19:06Z The majority of mass lost from the Antarctic ice sheet takes place at the fringing ice shelves via iceberg calving. Iceberg calving is controlled by the initiation and propagation of large scale rifts (fractures that penetrate through the entire ice shelf thickness), which precede large tabular iceberg detachment and can lead to ice shelf break- up. Our study area is the Amery Ice Shelf, East Antarctica, where we have observed over the past 5 Antarctic summer seasons an active rift system using a network of GPS and seismic stations. Here we report on the analysis of some of the GPS measurements. Strain rates are determined for a network of 11 sites observed over three weeks during the 2004/05 Antarctic summer period. In order to investigate possible changes in rift fracture mechanics, the results are combined with, and compared to, strain rates obtained in the 2002/03 season, when a sparser 6-station network was deployed for 46 days. Analysis of the network using a cumulative sum approach, obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is found to be an effective method to detect small baseline length changes. Conference Object Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* University of Tasmania: UTas ePrints Antarctic The Antarctic East Antarctica Amery ENVELOPE(-94.063,-94.063,56.565,56.565) Amery Ice Shelf ENVELOPE(71.000,71.000,-69.750,-69.750) |
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Open Polar |
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University of Tasmania: UTas ePrints |
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ftunivtasmania |
language |
English |
topic |
291001 Geodesy |
spellingShingle |
291001 Geodesy Janssen, V Coleman, R Strain rate distribution on an active ice shelf rift derived by GPS |
topic_facet |
291001 Geodesy |
description |
The majority of mass lost from the Antarctic ice sheet takes place at the fringing ice shelves via iceberg calving. Iceberg calving is controlled by the initiation and propagation of large scale rifts (fractures that penetrate through the entire ice shelf thickness), which precede large tabular iceberg detachment and can lead to ice shelf break- up. Our study area is the Amery Ice Shelf, East Antarctica, where we have observed over the past 5 Antarctic summer seasons an active rift system using a network of GPS and seismic stations. Here we report on the analysis of some of the GPS measurements. Strain rates are determined for a network of 11 sites observed over three weeks during the 2004/05 Antarctic summer period. In order to investigate possible changes in rift fracture mechanics, the results are combined with, and compared to, strain rates obtained in the 2002/03 season, when a sparser 6-station network was deployed for 46 days. Analysis of the network using a cumulative sum approach, obtained by differencing a pair of residual baseline time series situated approximately normal and parallel to the rift, is found to be an effective method to detect small baseline length changes. |
format |
Conference Object |
author |
Janssen, V Coleman, R |
author_facet |
Janssen, V Coleman, R |
author_sort |
Janssen, V |
title |
Strain rate distribution on an active ice shelf rift derived by GPS |
title_short |
Strain rate distribution on an active ice shelf rift derived by GPS |
title_full |
Strain rate distribution on an active ice shelf rift derived by GPS |
title_fullStr |
Strain rate distribution on an active ice shelf rift derived by GPS |
title_full_unstemmed |
Strain rate distribution on an active ice shelf rift derived by GPS |
title_sort |
strain rate distribution on an active ice shelf rift derived by gps |
publishDate |
2007 |
url |
https://eprints.utas.edu.au/5273/ https://eprints.utas.edu.au/5273/1/AGU2007_JanssenColeman_abstract.pdf https://eprints.utas.edu.au/5273/3/AGU2007_JanssenColeman_poster.pdf http://www.agu.org/meetings/fm07/ |
long_lat |
ENVELOPE(-94.063,-94.063,56.565,56.565) ENVELOPE(71.000,71.000,-69.750,-69.750) |
geographic |
Antarctic The Antarctic East Antarctica Amery Amery Ice Shelf |
geographic_facet |
Antarctic The Antarctic East Antarctica Amery Amery Ice Shelf |
genre |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* |
genre_facet |
Amery Ice Shelf Antarc* Antarctic Antarctica East Antarctica Ice Sheet Ice Shelf Ice Shelves Iceberg* |
op_relation |
https://eprints.utas.edu.au/5273/1/AGU2007_JanssenColeman_abstract.pdf https://eprints.utas.edu.au/5273/3/AGU2007_JanssenColeman_poster.pdf Janssen, V and Coleman, R 2007 , 'Strain rate distribution on an active ice shelf rift derived by GPS', paper presented at the 2007 AGU Fall Meeting, December 10-14, San Francisco. |
op_rights |
cc_utas |
_version_ |
1766363361148141568 |