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本文从成因上研究了组合模式与地震图上终止震相的联系。组合模式因积累单元端部有剪应力集中区,张应力让位区和弱介质让位区,故断层传播到积累单元端部要加速,然后急剧停止,这就导致了终止相的形成。这些端部因素是调整单元的存在引起的。地震图上的终止震相的发育程度与组合模式中的调整单元让位的充分程度有关,让位条件愈好,终止震相愈明显。最后本文以唐山地震为例进行了实际讨论。
In this paper, we study the relationship between the combination pattern and the termination phase of the seismogram from the genesis. Because of the shear stress concentration zone, tensile stress relaxation zone and weak medium abatement zone at the end of the accumulation unit, the combined mode propagates to the end of the accumulation unit to accelerate and then abruptly stop, which leads to the formation of the termination phase. These end-points are caused by the presence of tuning elements. The degree of development of the terminal seismic facies on the seismogram is related to the adequacy of adjustment units in the combinatorial model, and the better the yield condition, the more obvious the termination phase. Finally, this paper takes the Tangshan earthquake as an example to conduct a practical discussion.