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Strain rate distribution on an active ice shelf rift derived by GPS

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Janssen, V and Coleman, R (2007) Strain rate distribution on an active ice shelf rift derived by GPS. In: 2007 AGU Fall Meeting, December 10-14, San Francisco.

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Abstract

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.

Item Type: Conference or Workshop Item (Poster)
Page Range: EJ
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© 2007 American Geophysical Union

Date Deposited: 07 Apr 2008 15:28
Last Modified: 30 Nov 2009 01:36
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