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本文通过对1976年5月龙陵震群序列的余震空间分布的详细分析,得出龙陵序列是由多组次级序列组成的。7组M_a≥6.0级的余震序列在强震发生后短时间内的震中分布表明,各次级序列均显示了明显的优势方向和各自的分布范围,从而得出龙陵地震序列的余震分布空间格架。以1976年6月9日6.2级地震为界,龙陵余震先后活动在不同的区域。前一段余震活动完全在块体内部,后一段主要在块体外部。 对两次大震的四个Ⅸ度区附近可定震中的余震活动进行了对比,它们的余震活动时间、频度,释放能量都有极其显著的差别,因而认为,帮公、唐家两个Ⅸ度区是大震相应的震中区,平达和镇安两个Ⅸ度区不是大震震中区。
By analyzing the aftershock spatial distribution of the Longling earthquake swarm sequence in May 1976, we conclude that the Longling sequence consists of multiple sets of secondary sequences. The epicentral distribution of aftershock sequence of 7 groups M_a≥6.0 in the short time after the strong earthquake shows that each secondary sequence shows obvious predominant direction and their respective distribution range, and the aftershock distribution space of Longling earthquake sequence is obtained Grid. Based on the magnitude 6.2 earthquake on June 9, 1976, the aftershocks of Longling have been carried out in different regions. The aftershock activity of the previous period is completely inside the block, and the latter period is mainly outside the block. The aftershock activities in the quasi-epicenter near the four Ⅸ degree zones of the two major earthquakes are compared. Their aftershock activity time, frequency and energy release have extremely significant differences. Therefore, The Ⅸ degree area is the corresponding epicenter area of the large earthquake, and the two Ⅸ degree areas of Ping Da and Zhen’an are not epicenter areas of the epicenter.