Deep structure of the lithosphere beneath the territory of Bulgaria
РезюмеРaсчumaны временные невязкu Р волн nрuхо¶rt;ящuх nо¶rt; рaзнымu aзuмуmaмu u улaмu. Трехмернaя uнверсuя эmuх невязок ¶rt;aеm основу ¶rt;ля хaрaкmерuзaцuu сmрукmуры верхнеŭ мaнmuu nо¶rt; Болaрuеŭ. Мuзuŭскaя nлamформa u Ро¶rt;оnскuŭ мaссuв, ¶rt;вa рaзлuчных блокa mолщuхоŭ лumосферы nрuблuзumельно 130–140 км с зоноŭ¶rt;е лumосферa mоньше в¶rt;оль uх конmaкma. Обa блокa хaрaкmерuзовaны nроmuвоnоложно нanрaвленноŭ зaвuсuмосmыо оmносumельно высокоŭ u нuзкоŭ скоросmu Р волн. Эma нanрaвленнaя зaвuсuмосmь uнmерnреmuровaнa кaк nоруженuе aнuзоmроnных сmрукmур в верхнюю мaнmuю. Эmu сmрукmуры можно nре¶rt;сmaвumь кaк осmamкu naлеосуб¶rt;укцuŭ сmaроŭ океaнuческоŭ лumосферы.SummaryTeleseismic 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.