t2–x2 graph

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A time–distance graph, used in reflection seismology, in which travel times squared (t2) are plotted as a function of the offset squared (x2) to produce straight-line segments each of which represents the reciprocal of the layer root-mean-squared velocity squared (vrms2), and the intercept represents the depth (z) to the reflector. (vrms2t2 = 4z2 + x2.) See also t–d curve; and time– distance curve.

Subjects: Earth Sciences and Geography.

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