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首先提出了一种考虑构造应力场影响的有限元新模型和地震触发因子C.新有限元模型可以用来研究地震序列中的地震触发和应力场演化.地震触发因子C定义为滑动面上的剪应力和摩擦强度的比值,它可以用来预测地震能否触发以及触发区的范围.然后利用这个有限元新方法和地震触发因子C研究了1976年唐山地震序列的余震触发情况.结果表明唐山地震的应力场和断层带的非均匀性对余震触发有重要影响.落入新有限元模型预测的地震触发区中的余震要明显多于落入地震位错理论预测的地震触发区中的余震.
First, a new finite element model considering the effect of tectonic stress field and earthquake triggering factor C is proposed. The new finite element model can be used to study the seismic triggering and stress field evolution in seismic sequences. The seismic trigger factor C is defined as Which can be used to predict whether the earthquake can trigger or not and the range of the triggering zone.Then, using this new finite element method and the earthquake trigger factor C, we study the aftershock triggering conditions of Tangshan earthquake sequence in 1976. The results show that Tangshan The stress field of the earthquake and the nonuniformity of the fault zone have an important influence on the aftershock triggering.The aftershocks dropped into the earthquake triggering area predicted by the new finite element model are obviously more than the aftershocks falling into the earthquake triggering area predicted by the earthquake dislocation theory .