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Swiss Journal of Geosciences

, Volume 103, Issue 3, pp 329–344 | Cite as

Deep alpine valleys: examples of geophysical explorations in Austria

  • Ewald Brückl
  • Johanna Brückl
  • Werner Chwatal
  • Christian Ullrich
Article

Abstract

Results from geophysical explorations of three deep valleys, selected from different tectonic regimes in the Eastern Alps (Ötz-, Oichten-, and Drau Valley), are presented and discussed. Ongoing tectonic deformation may use tectonic structures related to these valleys. However, seismic activity is low there. During the Würm ice age, the thickness of the ice cover ranged between 300 and 1,500 m above present ground elevation. The geophysical investigations comprised reflection seismology, gravity- and resistivity surveys. The maximum depth down to the erosional base of the valleys varies from ~340 to 700 m. Distinct layer packages of the valley-infill at depths greater than 250 m were termed “old valley-fill”. Geophysical parameters and a comparison with the reflection seismic image of an intermediate layer at the recent Pasterze glacier suggest that the top of the “old valley-fill” represents the glacier bed during the decay of the Würm glaciation. Deep erosion is not related to high basal shear stress. The confluence of tributary glaciers is apparently not a significant factor for deep erosion in our examples of deep alpine valleys. We conclude that deep erosion may be related to high water pressure at the glacier bed, supported by specific processes of tectonic weakening.

Keywords

Deep alpine valleys Geophysical explorations Austria 

Notes

Acknowledgments

The geophysical investigations were funded by the Austrian Academy of Sciences (Ötz Valley), the Vienna University of Technology (Oichten Valley), the former Austrian Federal Ministry of Education, Science and Culture, and the Geocenter, Rohstoffforschung, Carinthia (Drau Valley). We further give our thanks to Verbund, Austrian Hydro Power AG, Vienna, and Pöyry Infra GmbH, Salzburg for permission to show the seismic profiles from Pasterze glacier, to P. Hacker for the permission to integrate the gravity data from the Ötz Valley into our study, and to RAG–Rohöl Aufsuchungs AG, Vienna for the permission to use the borehole data from the Oichten Valley. We further thank Dirk van Husen and an anonymous reviewer for their valuable remarks and hints for an improvement of this paper.

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Copyright information

© Swiss Geological Society 2010

Authors and Affiliations

  • Ewald Brückl
    • 1
  • Johanna Brückl
    • 1
  • Werner Chwatal
    • 1
  • Christian Ullrich
    • 1
  1. 1.Institute of Geodesy and GeophysicsVienna University of TechnologyViennaAustria

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