Of all the seismic waves, the fastest is called the p-wave, which is arguably the fastest traveling, reaching about eight kilometers per second, while at the depths of the Earth it is denser, perhaps even 13 kilometers per second, passing through solids, liquids, and even gases.<br><br>And in addition to this fastest, the second fastest is called s wave, and this wave, its propagation speed is much slower than the first wave, about 60% of the p wave, The speed per second should be about 4.8 kilometers, but this S-wave is also known as a cross-wave, mainly because it moves from side to side or up and down as it passes through a material, but it doesn't pass through all objects like the first wave, because it can't penetrate liquids and gases, so it can only pass through solid materials.
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