由于 P 波和 S 波以不同但相当恒定的速度传播，它们到达的间隔与到震源或初始破裂点的距离成比例地增加。
Because P and S waves travel at different but fairly constant speeds, the interval between their arrivals increases in proportion to the distance from the earthquake focus, or initial rupture point.
这是一个振幅恒定的波，在共轭的象平面上也是如此。
This is a constant - amplitude wave which is essentially the same on the conjugate image plane.
这是一个振幅恒定的波，在共轭的象平面上也是如此。
This is a constant-amplitude wave which is essentially the same on the conjugate image plane.
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