这可能反映了地震过程中的应力释放和震后应力的调整。
It may indicate the process of stress release and adjustment of the stress field during the strong earthquakes.
主震后，由于释放了绝大部分应力，余震序列则表现为低应力破裂过程。
After the main shock, most of the stresses have been released, so the aftershock sequences show a rupture process of lower stresses.
根据汶川地震同震静态位移我们计算了周围地区一些断层的库仑应力变化，并据此评价了震后周围地区断层和地震的活动性。
Coulomb stress changes caused by the Wenchuan earthquake are calculated and earthquake activity is evaluated using finite element method for some faults around the area.
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