Surface P Wave
Surface P Wave : The ray path of surface P consists of two segments: a) an Swave path from the source to the free surface with an apparent horizontal velocity equal to the P-wave velocity, and a P-wave path along the free surface to the receiver. Surface P-waves appear at the critical distance and can be a sharper arrival than the direct S waves, although they attenuate very rapidly with distance. In some respects they behave like diffracted or head waves
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