Accession Number : AD0774867

Title :   Corrections for Underwater Gravimetry.

Descriptive Note : Interim rept.,


Personal Author(s) : Andrews,Robert S.

Report Date : JAN 1974

Pagination or Media Count : 16

Abstract : Because underwater gravity surveys are usually conducted in coastal waters, several unique corrections are required to reduce the observed data for calculation of free-air and Bouguer anomalies. The most logical sequence for the application of corrections would be: terrain correction (if necessary) to reduce bathymetric irregularities to a flat, horizontal bottom; removal of the upward attraction of the water above the meter; free-air correction to bring the meter measurement to the surface of the reference spheroid; filling in the ocean below the spheroid with rock for a Bouguer anomaly calculation or with water for a free-air anomaly calculation. The terrain correction must be handled carefully as the bathymetric irregularities are immersed in water of finite density and, due to the close proximity of land, topographic irregularities immersed in air may be within the range of the correction graticule grid. (Modified author abstract)

Descriptors :   *Gravity, *Surveys, *Gravimetry, Underwater, Ocean bottom topography, Shallow water

Subject Categories : Geodesy
      Geology, Geochemistry and Mineralogy

Distribution Statement : APPROVED FOR PUBLIC RELEASE