Dictionary:Raypath

${\displaystyle \alpha _{0}=sin^{-1}(Vp)}$,
where ${\textstyle \alpha _{0}}$=angle with vertical, V=instantaneous velocity, and p=raypath parameter (q.v.). While seismic energy does not travel only along raypaths (i.e., seismic energy would reach points by diffraction even if the raypath were blocked), raypaths constitute a useful method of determining arrival time by ray tracing. Note that raypath bending depends on changes in velocity, not changes in acoustic impedance. Raypaths are usually shown on wavefront charts; see Figure W-3.