利用地震波对地下进行勘探与观察水下物体之间有许多相似之处。在空气中,我们的视觉只与从物体到我们眼睛传播的视线有关。但是当你去看水中的鱼时,水加到了视觉路径当中。如果水面平稳如镜,我们可以看到鱼的真实大小和形状,但看到的位置则不是真正所处的位置。鱼的位置发生了偏移,原因是水对于光线传播的速度不同,造成从鱼身上反射来的光线传播方向发生了变化。假设我们在鱼池中投入一石子,这使得情况变糟。水面泛起的波纹将鱼的 There are many similarities between the use of seismic waves for underground exploration and observation of underwater objects. In the air, our vision is only related to the sight that is transmitted from the object to our eyes. But when you look at the fish in the water, the water adds to the visual path. If the water is as smooth as a mirror, we can see the true size and shape of the fish, but the location we see is not really where we are. The position of the fish shifted, because the speed of water for light is different, resulting in changes in the direction of light transmission from the fish reflected. Suppose we put a stone in the fish pond, which makes the situation worse. Ripples of water surface will fish