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本文试图将地震活动空区划分为三类,并以川滇地区大量强震和中强震为例,着重研究第三类空区——环形图象及与之伴生的前兆震群的特征,给出了有关的经验公式。并对环形空区的出现与地震前兆阶段的关系及预报意义等问题进行了初步讨论。
This paper attempts to divide the seismic active areas into three types. Taking the large number of strong earthquakes and moderate earthquakes in Sichuan-Yunnan region as an example, this paper focuses on the characteristics of the third type of open space-annular image and its associated precursor swarm, The relevant empirical formula is given. The preliminary discussion is made on the relationship between the appearance of annular space and the precursor of earthquake and the significance of forecasting.