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在一次地震序列中主要的地震能量分两次释放的强震称双震型强震。本文对一九七六年龙陵、松潘、盐源三组双震型强震,从地震地质、余震分布结合前人模拟实验的成果和震源机制解的分析,对它们的成因机制作了探讨。认为由数条大断裂所围限的断块内部,当存在的规模相对较小的两组断层与最大主压应力轴的交角0均在30°—45°之间时(或θ在90°左右时),两组断层的破裂程度相近,或同时破裂,或略有先后,产生双震型强震。
The strong earthquakes with two major earthquakes released in one earthquake sequence are called double earthquakes. In this paper, the genesis mechanism of three pairs of strong earthquakes in Shuangling, Songpan and Yanyuan in 1976 was analyzed from the results of seismic geology and aftershock distribution and the results of previous simulation experiments and focal mechanism solutions . It is considered that within the fault block surrounded by several large faults, when the crossing angle 0 between the two relatively small-scale faults and the maximum principal compressive stress axis is between 30 ° -45 ° (or θ is 90 ° Left and right), the ruptures of the two faults are similar or both ruptured at the same time, or slightly before and after that, a strong earthquakes of double shock type are produced.