本文论述了唐山地震前的某些地震前兆现象,并对它们产生的原因进行了讨论。论述的第一种地震前兆现象是唐山地震前的震中迁移。在震前共显示了三条迁移路线,即从阴山西段向唐山的迁移,从辽东向唐山的迁移和沿华夏系构造向唐山的迁移。其迁移路线的交汇区在唐山地区。第二种是唐山大震前沿阴山构造带和华夏系构造带中小地震的成带活动,这两个中小地震活动带的交汇区在唐山地区。文中对震中迁移的原因和大震前中小地震成带状分布的原因以及带状分布的交汇区易于发生大震的原因进行了讨论。文中指出,中小地震的成带活动意味着这些带内地壳中一些地段上断层盘间的粘结力减弱或有流体逸出地表,这对交汇区震源的发震将有促进作用。例如在震源断层盘欲前进的方向上,地壳内如有流体逸出,则有利于断层盘向流体逸出地区前进,从而促使地震发生,在震源断层欲离开的部位上,如岩石粘结力减弱,也有利于断层错动而发震。据此我们把地震前兆分为主动前兆和被动前兆两类,主动前兆是它对震源发震有影响的前兆;被动前兆则仅是震源各组成部分运动的一种后果表现。文中对中国大陆于某些大震前出现的很长的地震成带活动进行了成因分类,一类是地表可见的大断裂带引起的中小地震活动;另一类是玄武岩层和上地幔中大断裂蠕滑对上部花岗岩层中地震的触发。由于玄武岩层和上地幔物质的力学性质近于塑性且相对均匀,所以其内的大断裂较长较直,这可能就是中国大陆内某些地震沿直线分布很长、其间可跨越不同的地质构造单元的原因。 This paper discusses some of the earthquake precursors before the Tangshan earthquake and discusses the causes of them. The first earthquake precursor discussed is the epicenter migration before the Tangshan earthquake. Before the earthquake, a total of three migrating routes were shown, that is, the migration from the western section of Yinshan to Tangshan, the migration from Liaodong to Tangshan and the migration to Tangshan along the Huaxia structure. The intersection of migration routes in Tangshan area. The second is the belt-forming activity of the middle and small earthquakes in front of the Tangshan earthquake along the Yinshan structural belt and the Huaxia structural belt. The intersection of these two small and medium-sized seismic activity belts lies in the Tangshan area. The reasons for the epicenter migration and the reasons for the zonal distribution of small and medium earthquakes before the earthquake and the reasons for the occurrence of large earthquakes at the intersections of zonal distribution are discussed in this paper. It is pointed out in the paper that the band-forming activities of small and medium-sized earthquakes mean the weakening of the cohesion between fault disks in some sections of these inland crusts or the escape of fluids to the earth’s surface, which will promote the seismogenic activities of the focal points in the confluence. For example, in the direction of the hypocentral fault disk, if any fluid escapes in the crust, it is favorable for the fault disk to move forward to the area where the fluid escapes, so as to promote the earthquake. In areas where the source fault leaves, such as rock bond Weakening, but also conducive to fault fault and seismogenic. Therefore, we divide the earthquake precursors into two types: active precursors and passive precursors. Active precursors are precursors that affect earthquake seismogenic activity. Passive precursors are only a consequence of the movement of each component of the source. In this paper, the genesis of the long-term earthquakes in China before some major earthquakes is classified into two types: the medium- and small-scale earthquakes caused by the large-scale visible faults on the earth’s surface; the other is the large- Triggering of Earthquakes in Upper Granite by Fracture Creep. Because the mechanical properties of the basalt and upper mantle materials are nearly plastic and relatively uniform, the large faults in the basalt layer and the upper mantle are relatively long and straight. This may be because some earthquakes in mainland China are distributed along a straight line and may span different geological formations Unit of reason.