【摘要】 华北东部盆岭区以地震多、震级大、损失惨重而著称。以往地震地质研究多注重断裂交汇、拐点、分枝等部位的控震作用。但是 ,华北盆岭区多次大震的烈度并不呈线型展布 ,震源也并非沿陡倾断裂走向分布 ,而是在一定深度上 (近水平 )弥散展布 ,故人们开始注意深部滑脱带控震的探讨。笔者依据近十余年华北地幔亚热柱的研究认为 ,华北断陷区之下为一强烈上隆的地幔亚热柱。地幔物质的上隆及上侵作用使上地壳裂解断陷 ,而中地壳在地幔、下地壳的影响下形成相间展布的低速—高导层。在地幔亚热柱热物质流向外拆离的带动下 ,中、下地壳亦由亚热柱顶部向外围拆离滑脱。当中、下地壳拆离到上地壳裂陷盆地边缘受到造山带的阻挡而减慢时 ,两者之间便产生剪切作用 ,导致应力不断积聚并阶段性释放 ,从而造成亚热柱外围地震频繁发生。更多还原

【Abstract】 The mountain-basin area in north China is noticed by its frequency of earthquake,strong magnitude and heavy losses.In the past,the intersection,inflection point and virgation of faults were often studied.At present,some researchers have paid more attention to study of detachment zone.According to the study of mantle plume for ten years,it is concluded that sub-mantle plume is strongly uplifting under fault basin of North China.The upwelling of mantle materials made the upper crust split and downfault.Under the influences of mantle and lower crust,the low-velocity layers alternating with high conductive layers distribution occurred in middle crust.Sub-mantle plume dragging mid-lower crust over mantle plume together glided forward its perphery,in the course of gliding,when the upper crust gliding to border of the basin,resisted by orogenic belt and velocity of gliding is slowing.The shearing between in the middle crust and lower crust leads to stress gathering constantly and releasing when high stress are concentrated,thus earthquake frequently occurred surrounding sub-mantle plume.更多还原