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。
P-waves are sometimes known as primary waves, because they travel faster through the Earth and so are the first to arrive at monitoring stations.
P波有时被看作纵波,因为它们以更快的传递速度穿越地球内部,因此最先被地震监测站台发现。
For P&G’s management, the biggest appeal may be the cost savings, which rumours suggest may be 15-25% of its previous travel budget.
对于保洁管理层来说,该系统最大的优点应该是节省成本,据说只有从前差旅预算的15%到25%。
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