Head Wave 3
Head Wave 3 :
Head waves are interface waves observed in a half-space that is in welded contact with another half-space with higher velocity when the seismic source is located in the lower-velocity medium. The wave enters the higher velocity medium at the critical angle of incidence and, after traveling along the interface at the higher velocity, re-enters the lower velocity medium at the critical angle. The wave front in the lower velocity half-space is a part of the surface of an expanding cone. For this reason, head waves are sometimes called conical waves. See section 2.5.3.5 ??? and Figs. 2.32 and 2.33 ??? in Chapter 2 of this Manual and Aki and Richards (2002 or 2009, p. 203-209).
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