摘要
根据地球物理资料的综合研究和地壳上地幔速度地震层析成象结果，系统地阐述了胶辽渤海地区基底厚度、地壳厚度、岩石层厚度和壳—幔结构比 Ｒ 值分布特征及地壳上地幔介质的横向非均匀性。研究结果表明：胶辽渤海地区是一个以渤海湾为中心的上地幔隆起区、软流层隆起区和壳—幔结构比 Ｒ 高值分布区；该区地壳上地幔介质在不同深度均存在显著的横向非均匀性，并在海域周围的海城、唐山、朝阳、东沟等陆地地区存在明显的壳内低速逆反层。
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.
出处
《华北地震科学》
1999年第2期43-51,共9页
North China Earthquake Sciences
基金
中国地震局 95-04-10-05 研究成果
国家自然科学基金(49674220)部分研究成果中国地震局 95-04-10-05 研
