How fast can an earthquake’s seismic waves travel through Earth?
Quick Answer
P waves can move at roughly 6 to 13 kilometers per second in Earth, while S waves are slower, often around 3.5 to 7 kilometers per second. The exact speed depends on the rock type and depth.
The Full Story
Seismic waves travel at different speeds depending on the material they pass through. P waves are compressional waves and are the fastest seismic waves, while S waves are slower shear waves. In the crust and mantle, their speeds vary with rock density, temperature, and pressure, so they are not constant everywhere. These speed differences are one reason seismologists can use wave arrival times to study Earth’s interior. The contrast is also why shaking from an earthquake often feels like a sudden jolt followed by rolling motion.
Key Facts
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Suggested video title for this topic:
"The invisible waves that race through Earth after a quake"
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