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Geophysical observations and structural models of two shallow caves in gypsum/anhydrite-bearing rocks in Germany

By
Georg Kaufmann
Georg Kaufmann
Institute of Geological Sciences, Geophysics Section, Freie Universität Berlin, Malteserstrasse 74-100, Haus D, 12249 Berlin, Germany
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Douchko Romanov
Douchko Romanov
Institute of Geological Sciences, Geophysics Section, Freie Universität Berlin, Malteserstrasse 74-100, Haus D, 12249 Berlin, Germany
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Published:
January 01, 2018

Abstract

The development of subsurface voids and cavities in soluble rocks is controlled by the hydrological and chemical processes in the host rock. Water (enriched with carbon dioxide) percolates through fractures and bedding partings of the host rock and removes material from the rock surface. As this enlargement is a highly heterogeneous process, only some fractures and bedding partings become significantly enlarged, evolving towards larger voids and caves. The size of the enlarged voids, often reaching the metre scale, can result in mechanically unstable structures, which, when close to the surface, are prone to collapse and thus are a hazard to infrastructure. We explored two caves in the anhydrite host rock of the Permian Zechstein sequences in northern Germany using geophysical measurements: the Kalkberghöhle close to Bad Segeberg (Hamburg region) and the Jettenhöhle close to Osterode (Harz region). Based on the results of gravity and electrical measurements, we were able to identify the cave voids and to characterize the local geological setting. Using these indirect geophysical observations, we deduced a structural model for both cave sites by numerical modelling. Our structural models were successfully calibrated against the Bouguer gravity data.

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Contents

Geological Society, London, Special Publications

Advances in Karst Research: Theory, Fieldwork and Applications

M. Parise
M. Parise
University Aldo Moro, Italy
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F. Gabrovsek
F. Gabrovsek
Karst Research Institute ZRC SAZU, Slovenia
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G. Kaufmann
G. Kaufmann
Freie Universität Berlin, Germany
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N. Ravbar
N. Ravbar
Karst Research Institute ZRC SAZU, Slovenia
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Geological Society of London
Volume
466
ISBN electronic:
9781786203786
Publication date:
January 01, 2018

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