Dictionary:Reduced traveltime

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Displaying refraction traces where x/V has been subtracted from the arrival times (x=offset distances) so that arrivals with the apparent velocity V are horizontal. If V is the refractor velocity, then the arrivals show the relief on the refractor. Reduced sections facilitate picking weak arrivals (especially secondary arrivals) and other refraction arrivals even where V is not precisely correct. A velocity of 6 km/s is often assumed as the reduction velocity in crustal studies.