Ground subsidence,Quaternary faults and vulnerability of utilities and transportation networks in Thessaly,Greece |
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| Authors: | V Kontogianni S Pytharouli S Stiros |
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| Institution: | (1) Geodesy Laboratory, Department of Civil Engineering, Patras University, Patras, 26500, Greece;(2) Technological University of Larisa, Larisa, 41110, Greece |
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| Abstract: | Ground fissures and subsidence have caused extensive damage in structures and the utility networks (roads, railroad line,
Larisa NATO airport, telecommunication network) in the plain of Thessaly, central Greece, in the last 20 years. The fact that
these fissures are parallel to Quaternary faults controlling the structural evolution of the Thessaly basin, marked by intense
recent seismic activity, led some scientists to regard them as manifestation of tectonic creep, even premonitory phenomena
of major future seismic events. A careful study of the geometric characteristics and of the kinematics of these ground fissures,
however, revealed that they only reflect shear failure of the ground due to compaction of loose sediments following significant
decline of the groundwater level due to over-pumping; i.e. a geotechnical and not a tectonic process. Furthermore, theoretical
considerations and modeling predict surface fissuring along zones of anomalous basement, normal-fault controlled topography.
This explains the correlation between ground fissures and active Quaternary normal faults. |
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| Keywords: | Consolidation Ground fissures Groundwater withdrawal Thessaly Greece Land subsidence Utility networks |
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