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。
An earthquake's point of initial rupture is called its focus or hypocenter.
据我国地震台网的初始破裂点的是所谓的重点或震源。
Scientists have found a way to estimate an earthquake's ultimate strength by analyzing the initial seconds of a rupture -- a step that could one day provide early earthquake warning.
美国研究人员最近发现了通过分析地震发生之初的前几秒的震波大小，便可以断定出地震最终强度的方法，从而为未来总有一天能够早些提供地震警报迈出了一步。
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