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本文考察了1966年邢台大震后我国大陆上(只限东部地区,不包括台湾省)25个6级以上地震的余震序列,指出这些序列主震后三天内余震数量集中,衰减迅速,衰减规律与其后的余震有所区别;且这部分余震在时间上控制着以后余震的发展,在空间上已经大体勾划出余震区。根据这些特征,可把余震分为直接余震和间接余震两类。文中分析了直接余震的特点,统计了间接余震与直接余震的关系,并提出根据直接余震特点来估计间接余震,预报序列发展的想法。文中还初步探讨了直接余震和间接余震的物理机制。
This paper examines the aftershock sequences of 25 earthquakes with magnitude more than 6 on the Chinese mainland (only in the eastern part except Taiwan Province) after the Xingtai earthquake in 1966, and points out that the aftershocks are concentrated, rapidly attenuated and decayed within three days after the main shock in these sequences And the aftershocks afterwards are different; And this part of aftershocks in time control the development of aftershocks in the future, has outlined the aftershock area in space. According to these characteristics, the aftershocks can be divided into direct aftershocks and indirect aftershocks. In this paper, the characteristics of direct aftershocks are analyzed, the relationship between indirect aftershocks and direct aftershocks is analyzed, and the idea of estimating indirect aftershocks and forecasting sequences based on the characteristics of direct aftershocks is proposed. The paper also discussed the physical mechanism of direct aftershocks and indirect aftershocks.