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。
This is considered a point of pre-rupture, since it is a matter of time before effort is abandoned.
这是关系破裂的临界点，因为没有努力的支撑，其迟早要发生。
Their faults are often very complex and slow-moving, sometimes taking hundreds or even thousands of years to build up tension to the point where they rupture.
那里的断层通常很复杂，而且移动缓慢，有时要花几百年甚至上千年来积攒压力，直到它们发生断裂的那一点。
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