Earthquake warning systems are hard, but not having one is worse.

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Cartoon showing a race between P, S and surface waves.

In the race between different seismic waves, fleet-footed P-waves are heralds for their slower and more earth-shaking brethren.

Cartoon showing a race between P, S and surface waves. The faster P waves get places faster, and let us know the slower and stronger S and surface waves are coming.

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