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。

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.

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但是震源仅仅距地面5千米，是上次的一半，距离震中仅仅10千米，而上次则是30千米。

But at 5km (3 miles) down, its focus was at half the depth—and the epicentre a mere 10km from the city compared with 30km last time.

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拥有70万人口的康塞普西翁市(concepcion)，距离震源115公里，一幢15层的公寓倒塌，100人被困。该市大学的生化实验室也发生了火灾。

In concepcion, a city of 700,000 people, 115km from the quake's source, a 15-storey block of flats collapsed, trapping 100 people, and a biochemical laboratory at the city university caught fire.

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