# Dictionary:T-ΔT analysis

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Normal moveout ( ${\displaystyle \Delta t}$ ) as a function of offset (${\displaystyle x}$) and arrival time (${\displaystyle t}$) that can be used to yield stacking velocity (${\displaystyle V_{s}}$):

${\displaystyle V_{s}={\frac {x}{\sqrt {2t\Delta t}}}}$

See velocity.