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TRANSALP "3D density structure and isostatic state of the Eastern Alps" |
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Short Introduction
Since more than 40 years the gravity group conducts gravity field research in the Eathern Alps During recent decades, quantitative interpretation of the gravity field of the Eastern Alps has been conducted only with respect to regional aspects. Due to sparse reflection and refraction seismic data in the Eastern Alps and because gravity data sets have been only available with a maximum spacing of 10 km, no detailed analysis of crustal structures was possible. Mainly 2-dimensional (2D) modelling along gravity profiles, crossing the Eastern Alps was performed in the past. Important 3D modelling results of the entire central part of the Eastern Alps were first published by Götze in 1984, who re-interpreted former 2D models using interactive 3D modelling tools.
Recently the three-dimensional (3D) lithospheric density structure of the Eastern Alps was investigated by integrating results from reflection seismics, receiver-function analyses and tomography. The modelling was carried out with respect to the Bouguer gravity and the geoid undulations and emphasis was laid on the investigations of the importance of deep lithospheric features. Although the influence of inhomogeneities at the lithosphere-asthenosphere boundary on the potential field is not neglectable, they are overprinted by the response to the density contrast at the crust-mantle boundary and intra-crustal density anomalies. The uncertainties in the interpretations are in the same order of magnitude as the gravity field generated by the deep lithosphere.
After including the deep lithospheric geometry from tomographic models. It is shown that full isostatic equilibrium is not achieved below the Eastern Alps. However, calculation of the isostatic lithospheric thickness shows two areas of lithospheric thickening along the central axis of the Eastern Alps with a transition zone below the area of the TRANSALP profile. This is in agreement with the tomographic model, which features a change in lithospheric subduction direction.
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Collaboraters (PIs):
H.-J. Götze, J. Ebbing, S. Schmidt
Partners:
B. Meurers, C. Braitenberg, E. Lüschen, Gebrande, J. Behrmann, M. Handy, K. Bram, G. Gabriel
Funded by:
Deutsche Forschungsgemeinschaft, GO 380 20/1-3
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Contact:
H.-J. Götze, Email: hajo[at]geophysik.uni-kiel.de
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