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Use x,y,z for ease of intuition. Let’s consider plane waves propagating in the x-z plane.

Use x,y,z for ease of intuition. Let’s consider plane waves propagating in the x-z plane. Which medium is faster ?. Why is the horizontal slowness ( p ) the same for P and S waves, but the vertical slowness different? Because we have horizontal boundaries !.

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Use x,y,z for ease of intuition. Let’s consider plane waves propagating in the x-z plane.

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  1. Use x,y,z for ease of intuition. Let’s consider plane waves propagating in the x-z plane.

  2. Which medium is faster?

  3. Why is the horizontal slowness (p) the same for P and S waves, but the vertical slowness different? Because we have horizontal boundaries!

  4. There has to be a continuity of motion along the boundary (e.g., the P waves leaving the boundary have to have the same frequency as the S waves arriving at the boundary).

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