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.
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。
2
This property represents the distance of the point from its origin.
该属性表示从原点到该点之间的距离。
3
Each successive point lies at a distance of the segment length plus the distance of the previous point from the origin.