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本文通过把地震于波产生分为两个阶段，即冲击波的形成和冲击波的传播，来模拟从爆炸到地震于波形成的过程，并研究通过低速带传播后的地震子波的频率变化。这对于如何设计最优的激发条件和客观地提高地震记录的分辨率有一定的参考价值。
In this paper, we divide the seismic wave into two stages, that is, the formation of shock wave and the propagation of shock wave to simulate the wave formation from explosion to earthquake and study the frequency variation of seismic wavelet after it propagates through low velocity band. This has certain reference value for how to design the optimal excitation conditions and objectively improve the resolution of seismic records.