Estimating rates of basal motion and internal ice deformation from continuous tilt measurements

Gudmundsson, Hilmar, Bauder, Andreas, Lüthi, Martin, Fischer, Urs and Funk, Martin (1999) Estimating rates of basal motion and internal ice deformation from continuous tilt measurements. Annals of Glaciology, 28. pp. 247-252. ISSN 0260-3055

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Abstract

Over a two-year period, continuous measurements of temporal changes in tilt, conducted with a string of tilt meters in a borehole on Unteraargletscher, Bernese Alps, Switzerland, have been used to estimate the basal-motion component. This estimation is based on a comparison of the measurements with synthetic tilt curves, computed using a parameterization of a simplified flow field. The best agreement is found for a ratio of basal motion to forward motion due to ice deformation (slip ratio) equal to about 1.2. Measured tilt curves exhibit a number of different transient features. While an overall increase in tilt angle is observed at every tilt-meter location, two of the sensors recorded anomalous tilt behaviour. These anomalies are characterized by sudden and drastic variations in tilt. A particularly intriguing example of such short-term tilt variations was recorded with a tilt meter positioned 40 m above the bed during the 1997 summer melt season.

Item Type:	Article
Subjects:	F800 Physical and Terrestrial Geographical and Environmental Sciences
Department:	Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User:	Becky Skoyles
Date Deposited:	21 Feb 2019 10:19
Last Modified:	10 Oct 2019 23:30
URI:	http://nrl.northumbria.ac.uk/id/eprint/38156

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