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本文通过通海地震序列、地震裂缝带、震源机制结果和前震等资料,首先分析了通海地震序列的时空分布特征;然后详细地讨论了通海地震的孕育过程。由于地幔物质的移动,先使余震深度剖面的下界面发生位移,在一个有利于应力集中的部位,早在5年前出现“先驱破裂”,加速岩石应变,并导至沿着曲江裂断滑动,发生主震。余震活动的空间图象,可以用布雷斯等人的破裂和光弹模拟实验结果很好的解释。
This paper first analyzes the spatial and temporal distribution characteristics of the Tonghai earthquake sequence by the data of the sea-going earthquake sequence, the seismic fracture zone, the focal mechanism mechanism and the foreshock. After that, the gestation process of the Tonghai earthquake is discussed in detail. Due to the movement of the mantle material, the lower interface of the aftershock depth profile is firstly displaced. At a site conducive to stress concentration, a “precursor rupture” occurred five years ago, accelerating the rock strain and leading to the fracture along the Qujiang fault Slide, the main shock occurs. The spatial image of aftershock activity can be well explained by the rupture and photoelastic simulation experiments of Blaise et al.