Abstract: Basing upon the recent field investigations, the principal features of the NW trending fault structure in Yanshan region are summarized in this paper.By analyzing structural, seismological and geophysical data, the authors demonstrated the space distribution, formation, development and movement mode of the NWW trending basement fault zones, as well as their relation to the seismicity. It is suggested that the NWW trending fault zone can be attributed to a crustal fault, controlling both the development of fault block structure and the recent seismicity. The fact that the NW faults spread en echelon and cluster into a zone is a indication of a NWW fault zone in the superficial strata. Moreover, the movement mode of the zone under investigation has a very close relation with the relative motion of the fault block structures. Since Mesozoic and Cenozoic periods, in addition to the differential movement, this fault zone was of shearing motion which had a very obvious changes in nature during the periods from Late Cretaceous to Early Tertiary.

摘要： 本文根据近年来多次野外考察所积累的实际材料,总结了燕山地区北西向断裂构造基本特征。文章结合地质构造、地震和地球物理资料的分析,论证了基底北西西向断裂构造带的空间展布、形成发展、活动方式及其与地震活动的关系。提出北西西向断裂构造带属于地壳断裂范畴,既控制了断块构造的发育,又控制了现代地震活动。北西向断裂构造密集成带和雁列式展布是北西西向断裂构造带在沉积盖层的一种表现。同时认为,北西西向断裂构造带的活动方式是与断块构造相对运动密切关联。中、新生代以来,其活动方式除了表现差异运动外,还具有剪切活动的性质,并约在晚白垩世—早第三纪剪切活动方式有明显地转变。