SEISMIC ANISOTROPY AND VELOCITY VARIATIONS IN THE MANTLE BENEATH THE SAXOTHURINGICUM-MOLDANUBICUM CONTACT IN CENTRAL-EUROPE

We report on results of a passive seismic experiment undertaken to stu dy the 3-D velocity structure and anisotropy of the upper mantle aroun d the contact zone of the Saxothuringicum and Moldanubicum in the west ern margin of the Bohemian Massif in central Europe. Spatial variation s of P-wave velocities and lateral variations of the particle motion o f split shear waves over the region monitor changes of structure and a nisotropy within the deep lithosphere and the asthenosphere. A joint i nterpretation of P-residual spheres and shear-wave splitting results i n an anisotropic model of the lithosphere with high velocities plungin g divergently from the contact of both tectonic units. Lateral variati ons of the mean residuals are related to a southward thickening of the lithosphere beneath the Moldanubicum.