# Dictionary:Apparent velocity

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{{#category_index:A|apparent velocity}}
**1**. The phase velocity that a wavefront appears to have along a line of geophones. If the wavefront makes the angle θ with the spread and the true velocity of the wavefront is *V*, then the apparent velocity is *V*/sinθ. See Figure W-2. **2**. The inverse of the slope of a refraction time-distance curve.