【摘要】 介绍了华北地区的海原、张北、唐山-滦县、邢台、临汾、菏泽、大同-阳高、三河-平谷、延庆-怀来等强震区的地震测深研究成果,分析了强震区的主要深部构造背景。研究表明,地壳深部断裂、中下地壳低速层、速度结构的差异、泊松比和岩性的不同、复杂的壳幔过渡带、滑脱构造等构造特征与华北地区强震形成和发生有较为密切的关系。更多还原

【Abstract】 Deep seismic sounding results of strongly seismic regions in North China are introduced. The deep tectonic background of several strongly seismic regions, such as Haiyuan, Zhangbei, Tangshan-Luanxian, Xingtai, Linfen, Heze, Datong-Yanggao, Sanhe-Pinggu,Yanqing-Huailai, are revealed. The analysis shows that the formation and occurrence of strong earthquakes in North China are closely related with several structural feature: deep fault in crust, the low velocity layer in the middle and lower crust;difference between velocity structures, Poisson ratio and lithology; complex crust-mantle transitional belt, detachment structure.更多还原