(1) Geophysical Institute, Academy of Science of the Czech Republic, Prague
The Trans-European Suture Zone (TESZ) is the most prominent tecto-geological boundary within Europe separating mobile Phanerozoic terranes in the western part from the Precambrian East-European Platform in the eastern part. Distinct changes of seismic anisotropy of the mantle lithosphere are related to this intra-continental suture. The effect is observable in various wavelengths as well as seismic wave types. A passive teleseismic field experiment -TOR- traversing the northern part of the TESZ in Germany, Denmark and Sweden was conducted during 1996-1997. The array recorded data for teleseismic tomography of the upper mantle with a high lateral resolution, about few tens of km, including data for seismic anisotropy studies. Our anisotropic tomography, based on joint inversion of P-residual spheres and shear-wave splitting parameters aims at retrieving a 3D orientation of anisotropy around the TESZ and mapping lateral changes of the 3D orientation of anisotropic structures along the TOR antenna. We interprete the observed seismic a nisotropy by the preferred orientation of olivine crystals. Anisotropic models of the mantle lithosphere are characterized by dipping anisotropic structures. It is evident that different orientations of large-scale olivine fabrics on both sides of this major suture zone extend through the whole lithosphere.
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