Accession Number:

AD0649357

Title:

USE OF THE SECOND VERTICAL DERIVATIVES OF THE GRAVITY POTENTIAL FOR THE GEOLOGICAL INTERPRETATION OF THE GRAVIMETRIC,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1959-09-01

Pagination or Media Count:

18.0

Abstract:

The calculation of anomalies of the second vertical derivatives of the gravity potential on the basis of gravity anomaly values on a plane surface is a fairly cumbersome process. It sometimes proves to be even more laborious than the method of local anomaly isolation by means of the averaging of gravimetric charts with the aid of a graticule. 1 On charts of differential gdifferential Z isanomalous lines, the anomalies, which are hardly noticeable on gravity isanomaly charts, become distinctly visible. It could be said that a differential gdifferential Z chart develops a delta g map while requiring no complementary hypotheses. 2 In contrast to the other methods for the isolation of local anomalies, in calculating differential gdifferential Z we obtain entirely realistic physical quantities which may be used for quantitative computations. 3 In contrast to delta g anomalies, which constitute relative quantities, the quantity differential gdifferential Z has an absolute value. The differential gdifferential Z anomalies manifest themselves with greater sharpness and precision over the shallow-lying anomalous masses than the delta g anomalies. Consequently, they may be used with great success for the calculation of the depth at which the anomalous masses are buried under the assumption that the latter have, for example, a spherical shape. Author

Subject Categories:

  • Geomagnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE