Abstract: On the basis of available data mainly from seismic sounding crustal structures in North China are held to be characteristic of 1) vertically layered crust,consisting of upper,middle and lower crust,the reverse of seismic velocity occurs in the middle layer as shown on the seismic profiles;2) the lateral inhomogeneity and discontinuity on the Moho,sharp abruption of the velocity often points to the peaks of the Moho relief.Comprehensive analyses have been made for earthquake-generating structures in de-ep earth,geothermal activity and motion of deep-seated substances.

摘要： 综合国家地震局地球物理勘探大队在华北地区开展以人工地震测深为主的深部探测成果,认为该地区地壳结构具有如下特点; (1)纵向的分层特性。沿纵向可划分为上层地壳、中层地壳和下层地壳三部分。在很多地震剖面上,中层地壳为一低速层,出现了速度逆转现象。 (2)莫霍界面沿横向的波浪起伏性和不连续性。莫氏面多在其波浪起伏的“拐点”处被断开。在此基础上,分析了华北东部地区强震的深部构造背景,地热活动和深部物质活动。