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本文分析了环绕1970年通海7.7级地震区和1965年东川6.5级地震区的几个三角网的复测资料得出水平面内的应变特征.指出通海地震震中区水平面内的应变张压呈四象限分布,东川地震前震中区的张压应变也呈象限分布,并指示主断面的运动方向.我们用弹性回跳理论解释了这一现象,并指出它在地震预报中的意义.另外,本文还扼要地讨论了震前震区应变四象限分布在时间和空间上可能观测到的范围.
In this paper, we analyzed the strain characteristics in the horizontal plane based on the reanalysis data of several triangulated networks around the 7.7 Tonghai 7.7 earthquake area and the 6.55 Dongchuan earthquake area in 1965. It is pointed out that the strain strain in the horizontal plane of the epicenter area of the Tonghai earthquake is four In the quadrant distribution, the tensile and compressive strain in the epicenter before the Dongchuan earthquake also shows a quadrant distribution and indicates the movement direction of the main section.We explain this phenomenon by the elastic bounce theory and point out its significance in earthquake prediction.In addition, This article also briefly discusses the possible four-quadrant strain distribution in the earthquake zone before and after the earthquake may be observed in the scope of space.