通常，波长较短传播较慢—但是破坏性要大的多—的S波会随之而来。 通过这两种波到达时间的差值可以估算震中的距离。
type of waves can be used to estimate distance to the epicenter.
一波剧烈的市场调整也会有同样的破坏性效果。
A sharp market correction can have the same damaging effect.
预警系统的工作原理是探测最初从震中传出的地震波，其速度要比破坏性的剪切波快。
The warning system works by detecting primary waves, which spread from the epicenter of a quake and travel faster than the destructive shear waves.
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