中文摘要：

设地震破裂为一个以有限速度扩展的双侧破裂走滑断层，在1°×1°的研究范围内，通过离散波数法合成理论位移地震图，计算研究区域中144．个场点的位移时程，在此基础上得到了应变时程和动态应变场，并讨论了应变时程的动态特征和动态应变场的分布特征。地震破裂动态应变场的计算为将来实现地震动态库仑破裂应力场的计算奠定了基础。

英文摘要：

Suppose a seismic rupture to be a strike-slip fault with bilateral rupture at a finite expanding speed, in the 1°×1°range of research, we calculate displacement time histories at 144 field points according to the theoretical displacement seismograms synthesized with discrete wave-number method. On the basis of this, we obtain strain time histories and dynamic strain field, and discuss the dynamic characteristics of strain time histories and the distribution features of dynamic strain field. The calculation of the dynamic strain field caused by the seismic rupture lays a foundation for the calculation of seismic dynamic Coulomb failure stress field in the future.