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TitleProcedures for calculating terrain corrections for gravity measurements
AuthorStacey, R A; Stephens, L E
SourcePublications of the Dominion Observatory vol. 39, no. 10, 1970, 15 pages, (Open Access)
PublisherCanada Department of Energy, Mines and Resources
Mediapaper; on-line; digital
File formatpdf
Subjectsgeophysics; mathematical and computational geology; gravity interpretations; bouguer gravity; gravity anomalies; topography; models; software; methodology; error analysis
Illustrationsschematic representations; diagrams; graphs; sketch maps; tables
Released1970 01 01; 2018 11 19
AbstractThe published methods of computing terrain corrections for Bouguer anomalies from topographie data based on hollow cylinder, vertical prism, frustum of a cone and inclined plane models are reviewed. The method used at the Dominion Observatory is based on a combination of the hollow cylinder mode! for representing the local terrain and the prism mode! for the regional terrain. This method has been developed specifically for use in the Cordilleran region of western Canada and is intended to give final Bouguer anomalies as accurate as those based on measurements in the Prairie and Shield regions of Canada where the topography is more subdued. lt is concluded that this accuracy is only possible if: (i) the observed gravity values are of the same accuracy throughout Canada; (il) the coordinates and elevation of stations in the Cordillera are accurate to 100 m and 7 m, respectively; (ili) 1 :50,000 topographie maps are available for the area of the gravity survey; and (iv) the resulting terrain correction is less than 12.5 mgal. The specifications for the computer programs developed in conjunction with the methods used at the Observatory are given in an appendix to the report.