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Their velocity (P-waves travel more quickly than S-waves) and their mode of propagation (the way they move through the earth). S-waves are transverse waves which move material from side to side (particle motion is normal to direction of travel) whereas P-waves are compression or longitudinal waves where particle motion is parallel to the direction of travel.

This means that P-waves can travel through solids, liquids and gasses whereas S-waves can only travel through solids.

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13y ago

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