强地震前的地震空区已有许多研究,存在着不同的勾划原则和结果。本文从地震构造成因的观点出发,以寻求强震前构造活动状态为目的,把地震空区及与其配合的地震分布图象都看做是在区域构造应力场作用下两条共轭断层相互作用的结果,作者把华北地区三个相似的地震空区称之为地震构造空区。三个空区是唐山地震(图1)、海城地震(图2)前的空区和现在仍然存在的邯郸空区(图3)。 There have been many studies on the earthquake zone before the strong earthquake. There are different principles and results of the delineation. In this paper, from the point of view of the causes of seismic tectonics, the purpose of seeking tectonic activity before strong earthquakes is to consider both the seismotome and its associated seismic distribution images as the interaction of two conjugate faults under the regional tectonic stress field The author calls three similar seismic areas in North China the seismic tectonic space. The three vacant areas are the Tangshan earthquake (Figure 1), the empty area before the Haicheng earthquake (Figure 2) and the still existing Handan space (Figure 3).