The effect of topography and its isostatic compensation on free air gravity anomalies
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Date
1963-12
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Ohio State University. Division of Geodetic Science
Abstract
The effect of topography and its isostatic compensation for all 5° x 5° surface elements has been calculated, using the T = 30 km, Airy-Heiskanen local isostatic system, and the available 5° x 5° mean free air anomalies based on measurements. Measured 5° x 5° mean free air anomalies on the Atlantic Ocean, on the North American Continent, and at its shores were the test areas used for the adjustments. In the test areas, these calculated 5° x 5° mean free air anomalies would represent the measured 5° x 5° mean free air anomalies so that the standard errors on the oceans are about ±6 mgal, on continents and at the coasts about ± 11 mgal. The calculated anomalies are developed into spherical harmonics up to the 8th order. Also, 5° x 5° mean free air anomalies for the entire Earth are given, consisting of 5° x 5° mean free air anomalies based on measurements wherever available as given by Uotila, and the remaining 5° x 5° elements have anomalies extrapolated from known and calculated anomalies. Mean elevations for all 5° x 5° elements were estimated, and are given in meters. The mean effect of topography and its isostatic compensation of the Hayford zones 18 - l is given in the Airy-Heiskanen, T = 30 km isostatic system for every 5° x 5° surface element.
Description
Prepared for Air Force Cambridge Research Laboratories, Office of Aerospace Research, United States Air Force, Bedford, Massachusetts: Contract No. AF 19(628)-2771, Project No. 7600, Task No. 76002