地震改变邻近断层的剪切应力和正应力。新的证据支持小应力变化导致大的地震活动速率变化的假说。地震活动速率(余震)在应力增加的地方增加,在应力降低的地方减少。地震活动速率的增加和降低之后均有随时间而变化的恢复。将应力变化转换成发震概率变化时,可以看到地震之间的相互作用对地震危险性产生了很大的影响。 Earthquakes change the shear stress and normal stress of adjacent faults. New evidence supports the hypothesis that small stress changes lead to large changes in seismic activity. Seismic activity rates (aftershocks) increase where stress increases and decrease where stress decreases. After the increase and decrease of the earthquake activity rate, the changes over time are recovered. Transforming the stress changes into the probabilities of seismogenic changes, we can see that the interaction between the earthquakes has a great impact on the seismic risk.