Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...78..157b&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 78, Issue 3-4, p. 157-166.
Physics
23
Scientific paper
We analyse the results of measurements of shear-wave splitting due to azimuthal 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 azimuthal 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° in the western part of the region to 100-120° 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.
Bormann Peter
Burghardt P.-T.
Makeyeva L. I.
Vinnik Lev Pavlovich
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