orogenes P. Giese 57 Deep structure of the Baikal region from seismic data S . V. Krylov and B. P. Mishenkin...Geophysical Institute, University of Karlsruhe, F. R. Germany ABSTRACT Petrological models for the upper mantle...suggested by mantle xenoliths from various parts of Germany, cannot explain the velocity depth and azimuthal...mechanism f or the observed phenomena . In Southern Germany its fast a-axis at the Moho is directed towards...strongest gradients have been observed in Southern Germany (Fucns, 1979,1980; Fuchs et al ., 1981; Fuchs and