Seismic PKP arrivals are sensitive to P velocity structure in the lowermost mantle.
PKP震相包含了下地幔底部P波速度结构的重要信息。
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。
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