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Which earthquake wave does not pass through liquids?

Answer and explanation

Correct answer: S wave

The direct answer is D, S wave. Earthquake waves are vibrations released by an earthquake. P waves are compressional waves and can travel through solids, liquids and gases. S waves are shear waves: they make particles move perpendicular to the direction of travel, so the material must provide resistance to shearing. Liquids cannot support this kind of shear motion, so S waves cannot pass through them. Option A, P wave, is wrong because P waves can pass through liquids, although their speed changes. Option B, surface wave, is wrong because it is a wave that travels along the surface and is not the specific body wave identified by this property. Option C, sea wave, is an ordinary water wave, not the earthquake-wave answer asked here. Option D is correct. This fact also helps prove that Earth’s outer core is liquid: S waves disappear at the outer core. Memory cue: S means shear; no shear in liquid.

Related tags

S WavesLiquid Outer CoreSeismic Evidence

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