DATUM – DEFINITION

datum azimutalDatum is an arbitrary reference surface, the reduction to which minimizes local topographic and near-surface effects.
Elevation datum is the reference level for elevation measurements, often sea level. Seismic datum, an arbitrary reference surface, the reduction to which minimizes local topographic and near-surface effects. Seismic times and velocity determinations are referred to the datum plane (usually but not necessarily horizontal and planar) as if sources and geophones had been located on the datum plane and as if no low-velocity layer existed. A paleo-datum is used in an attempt to restore strata or reflections to the structural positions held at some ancient time.

Datum correction: A calculation of the time required for a seismic pulse to travel from the source to the datum plane and from the datum plane to the geophone. This value is subtracted from observed reflection times to give the arrival time as if sources and geophones had been located on the datum surface without any low or irregular velocities below the datum. Datum correction velocity: The velocity assumed beneath the datum surface, often the subweathering velocity.

Datuming is the arbitrary flattening and straightening of a particular reflection for use as a reference on a cross-section, i.e., using a paleo-datum; flattening thereby assuming that everything was horizontal at the time of the paleodatum. The result emphasizes differences between this and other reflections.

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