The underwater earthquake happens and the seismic waves spread out.
布莱恩·希罗：水下地震发生以后，震波会扩散出去。
In order to spread this technique, I have made trial VSP modeling during shothole drilling: shallow seismic velocity survey during shothole drilling.
为了应用和推广这一新技术，我们做了随钻VSP模拟试验，即地表浅层炮井随钻地震速度测量。
In the analysis, both the coupled vibration of four level structures under earthquake and the randomness of spread directions of input seismic waves were considered.
在分析中，考虑了四层高架结构在地震时的耦合振动作用，以及地震波传播方向的任意性。
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