Analysis of Deflection-of-the-Vertical Inner-Zone Methods.
Abstract
In the Vening Meinesz method of computing deflection of the vertical, the effect of the region surrounding the computation point (termed the inner zone) is usually determined by some special algorithm. A new method based on the representation of gravity anomalies by a sequence of discrete bicubic surfaces and the integration of these surfaces by the flat-earth approximation is given and compared with three existing inner-zone techniques. These techniques, designed for mean-anomaly cells in the shape of trapezoids are (1) two applications of Fischer's method termed Fischer IZN1 for an inner zone with area of about 4 sq nm, and Fischer IZN2 for an inner-zone with area of about 16 sq nm (2) the standard method, in which the inner-zone cells are treated by the Vening Meinesz formula and (3) the rim method in which the deflection effect of the cells surrounding the inner zone is multiplied by a constant. (Modified author abstract)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1974
- Accession Number
- AD0776225
Entities
People
- Angelo L. Kontis
- Rudolph R. Michlik
- Thomas M. Davis
Organizations
- Naval Oceanographic Office