The seismic waves (P and S waves) propagate through the Earth's interior in all directions. The only reason why seismic waves travel slower while going deeper is because of the density difference and of the media it is passing through. For example, seismic waves move more slowly through a liquid than a solid. Molten areas like the mantle within the Earth slow down P waves and stop S waves because their shearing motion cannot be transmitted through a dense liquid.
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The seismic waves (P and S waves) propagate through the Earth's interior in all directions. The only reason why seismic waves travel slower while going deeper is because of the density difference and of the media it is passing through. For example, seismic waves move more slowly through a liquid than a solid. Molten areas like the mantle within the Earth slow down P waves and stop S waves because their shearing motion cannot be transmitted through a dense liquid.