Teleseismic shear-wave splitting and deformations in Central Europe

Bormann, P.; Burghardt, P. T.; Makeyeva, L. I.; Vinnik, L. P.; 2.1 Physics of Earthquakes and Volcanoes, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum

doi:10.1016/0031-9201(93)90153-Z

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Teleseismic shear-wave splitting and deformations in Central Europe

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Bormann, P.
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Burghardt, P. T.
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Makeyeva, L. I.
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Vinnik, L. P.
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Bormann, P., Burghardt, P. T., Makeyeva, L. I., Vinnik, L. P. (1993): Teleseismic shear-wave splitting and deformations in Central Europe. - Physics of the Earth and Planetary Interiors, 78, 3-4, 157-166.
https://doi.org/10.1016/0031-9201(93)90153-Z

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_226255

Abstract

Abstract: We analyse the results of measurements of shear-wave splitting due to azimuthally anisotropy in the upper mantle of Central Europe, based on the SKS technique. The observations at seismograph stations in the eastern part of Germany are combined with the published estimates of the parameters of azimuthally anisotropy at neighbouring locations. These data are interpreted in terms of lattice preferred orientation of olivine which is caused by deformations in the upper mantle. Directions of polarization of the fast wave counted clockwise from north change from 50-70 degrees in the western part of the region to 100-120 degrees in the eastern part. These directions are close to the trend of the Hercynian fold belt and might suggest that anisotropy is frozen in the subcrustal lithosphere. However, the observed traveltime delays between the split waves are generally too large to be easily reconciled with the thermal and seismic estimates of thickness of the subcrustal lithosphere underneath Central Europe Additional keywords: azimutale Anisotropie, Mitteleuropa, Krustendeformation, Deformationen im oberen Erdmantel, schnelle Polarisationsrichtung, bevorzugte Ausrichtung des Kristallgitter, Olivinausrichtung, absolute Plattenbewegung