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1. n. [Geophysics]

A phenomenon of relative seismic velocities of strata whereby a shallow layer or feature with a high seismic velocity (e.g., a salt layer or salt dome, or a carbonate reef) surrounded by rock with a lower seismic velocity causes what appears to be a structural high beneath it. After such features are correctly converted from time to depth, the apparent structural high is generally reduced in magnitude.

Antonyms: push-down

See: depth conversionsalt domevelocity anomaly

Diagram of a pull-up.
Diagram of a pull-up.