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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 OBS

In seismic measurements, the corrections applied to observed reflection time values due to differences of station elevation in order to reduce the observations to an arbitrary reference datum or fiducial plane.  1, record 1, English, - elevation%20correction

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 OBS

En théorie, on suppose que le point d'impulsion et les géophones sont situés sur un même plan horizontal en surface; en pratique, cette situation idéale est rarement réalisée. Il faut donc corriger les temps d'arrivée des ondes sismiques. En sismique réfraction, on projette le point d'impulsion et le point de localisation du géophone sur un plan horizontal commun (...)  1, record 1, French, - correction%20d%27%C3%A9l%C3%A9vation

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 OBS

In gravity measurements, the corrections applied to observed gravity values because of differences of station elevation to reduce them to any arbitrary reference or datum level usually at sea level. The corrections consist of (1) the free-air correction, to take care of the vertical decrease of gravity with increase of elevation, and (2) the Bouguer correction to take care of the attraction of the material between the reference datum and that of the individual station.  1, record 2, English, - elevation%20correction

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 OBS

[Elle] n'en est pas une en soi mais elle représente la somme des corrections à l'air libre et de Bouguer.  1, record 2, French, - r%C3%A9duction%20d%27altitude

Record 2,  Textual support,  Spanish