<p><strong>SF Fig. 7.4.</strong> This diagram shows hypothetical S and P wave propagation through the earth from an earthquake. P waves (arrows in yellow) can penetrate through the mantle and core, but S waves (arrows in red) can only travel through the mantle.</p>

SF Fig. 7.4. This diagram shows hypothetical S and P wave propagation through the earth from an earthquake. P waves (arrows in yellow) can penetrate through the mantle and core, but S waves (arrows in red) can only travel through the mantle.

Image by Byron Inouye