STRUCTURAL CHARACTERISTICS OF CRUST AND UPPERMANTLE AND INHOMOGENEITY OF THE MEDIUM IN JIAOLIAO AND BOHAI REGIONS

Based on the synthetic research of the geophysical data and the seismic tomography of crust and upper mantle velocity,the present paper deals systematically with the distribution features of the thickness of basement、crustal thickness、lithospheric thickness and the crust mantle structural ratio value R,as well as with the lateral inhomogeneity of the crust and upper mantle.The results indicate that the Jiaoliao and Bohai area is an uplift region of upper mentle,the centre of which is Bohai gulf,an uplift region of asthenosphere and an distributed region of higher crust-mantle structural ratioR;There exist remarkable lateral inhomogeneity of crustal and upper mantle medium at different depth in the area.There exist also clear lower velocity reverse layers within the crust in some continental region around the sea area such as Haicheng、Tangshan、Chaoyang、Donggou etc.The above significant phenomena provide key evidences for geodynamics and the development of Seismology.