Dictionary:Pennebaker plot

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{{#category_index:P|Pennebaker plot}} (pen’ ē bā, k∂r) A plot of logΔt versus logz, where Δt is interval transit time and z is depth. Normal compaction is indicated by a straight line with a slope –1/4; deflection of the graph to greater Δt indicate overpressure (q.v.). See Pennebaker (1968).