震后的地壳垂直运动恰好相反，明显地反映了弹性回跳特征，震源也刚好位于四象限交叉点附近。
The vertical crustal movement after the quake is just on the contrary. This shows the characteristics of elastic rebound and the hypocenter is just near the quadrantal intersection.
本文从弹性回跳学说出发，介绍一种分析方法。以唐山大地震为例，处理了1969—1975年唐山市周围区域的水准复测资料。
Based on the elastic rebound theory, an analysis method is proposed in this paper, And the data of relevellings from 1969 to 1975 around the Tangshan area are processed as an example.
岩样的快速回跳条件就是系统(由剪切带及带外弹性岩石构成)的失稳判据。
It is found that the criterion is in agreement with the criterion of instability for the system composed of shear band and elastic rocks outside the band.
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