It computes the distribution of velocity in the rock and soil body using speed information of seismic wave by special methods.
这种技术利用大量的地震波速度信息进行专门的反演计算，得到测区内岩土体弹性波速度的分布规律。
The reconstruction of seismic wave-speed distribution is nonlinear.
重建地下速度分布是一个非线性问题。
The most remarkable feature of the upper mantle is the low-velocity zone. as suggested by its name, this is a region in the upper mantle in which there is a decrease in the speed of seismic wave.
上地幔一个最显著的现象就是低速带，就像这个词名所表达的那样，在上地幔存在这么一个区域，在那里地震波波速会发生减慢。
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