Deep structure of the lithosphere beneath the territory of Bulgaria |
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Authors: | Vladislav Babu?ka Jaroslava Plomerová Edelvays Spasov Reviewer J Janský |
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Institution: | (1) Geophysical Institute, Czechosl. Acad. Sci., Prague;(2) Geophysical Institute, Bulg. Acad. Sci., Sofia |
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Abstract: | Summary Teleseismic P residuals calculated for waves arriving from various azimuths and angles of incidence, and a 3-D inversion of the residuals provided the basis for characterizing the uppermost mantle structure beneath Bulgaria. The Moesian Platform and the Rhodopean Massif are two different blocks characterized by a lithosphere thickness of about 130–140 km with a zone of lithosphere thinning along their contact. Both units have opposite patterns of the directional dependence of relatively high and low P velocities. This directional dependence is interpreted by dipping anisotropic structures in the subcrustal lithosphere, which probably represent remnants of paleosubductions of an old oceanic lithosphere.
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