云南通海和东川两次地震的地面应变的象限性分布
ON THE QUADRANT PATTERN OF STRAIN DISTRIBUTION OF THE TONGHAI AND DONGCHUAN EARTHQUAKES, YUNNAN PROVINCE
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摘要: 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.Abstract: In this paper, the strain distribution around the epicentral regions of the 1970 Tonghai Earthquake, M=7.7 and the 1965 DongChuan Earthquake, M=6.5, Yunnan Province, has been studied. It is found that the tensional and compressional areas of the earthquakes distributed themselves in separate quadrants. Before the DongChuan earthquake, there were tensional and compressional areas in the block west of the earthquake fault. The phenomenon has been interpreted on the basis of the elastic rebound theory and its significance in earthquake prediction discussed.In addition, the authors also give a brief account on the possibility of observing the phenomenon of quadrant pattern of strain distribution with respect to the time range before the earthquakes and the areal extent around the epicenters.
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