The direction of longest echo time is the direction of minimum earth stress, and the direction of greatest earth stress is perpendicular to it.
回波时间最长的方向为最小地应力方向，最大地应力方向与之垂直。
The higher-frequency sounds are of little use for seismic imaging because they dissipate in the earth, contributing little to images based on the signals that echo up to the surface.
此外，较高频率的声音是很少用于地震成像方面的，因为该高频声音的能量会消耗在土里，导致其返至地面的信号对于成像基本没有作用了。
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