【摘要】 本文利用重力资料计算了华北地区康氏面和莫氏面的深度,从而得出了这一地区地壳结构的基本形态。结果发现,华北地区的三个地震带——从渤海经北京到张家口的北西向地震带、以太行山为对称轴的河北地震带和山西地震带——从深部来看都处在上地幔相对隆起的部位上。因此,作者认为,重力和重力均衡调整的作用在很大程度上影响了华北大地构造的发育,塑造了其地壳结构的基本形态,因而也就制约了华北地区的地震活动。更多还原

【Abstract】 Using gravity data the depths of Moho and Conrad discontinuities in North China region are calculated and thus the basic configuration of crustal structure in this region can be determined. The results obtained indicate that three seismic belts, namely, NW trending belt extended from the Bohai Bay through Beijing to Zhangjiakou, Hebei belt with the Mt. Taihangshan as a symmetric axis and Shanxi belt, located in the relatively uplifted portion of upper mantle in regard to their depths. Therefore, it is considered that isostatic adjustment exerts effect on the development of geological structures and the formation of their basic configuration to a large extent. Consequently, these processes control the seismic activity in North China region.更多还原