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

• Published in: Annals of Glaciology
• Main Authors: Gudmundsson, Hilmar, Bauder, Andreas, Lüthi, Martin, Fischer, Urs, Funk, Martin
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: International Glaciological Society 1999
• Subjects: F800 Physical and Terrestrial Geographical and Environmental Sciences; Annals of Glaciology
• Online Access: https://nrl.northumbria.ac.uk/id/eprint/38156/; https://doi.org/10.3189/172756499781821751

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.