Calculation of gravity and magnetic anomalies along profiles with end corrections and inverse solutions for density and magnetization
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Abstract
An equation derived for the vertical gravity field due to a body with polygonal cross section and finite strike length. The equations consists of the 2-dimensional equation of Talwani, Worzel, and Landisman (1959), with the addition of end corrections. Equations for the magnetic field due to a similar body were derived by Shuey and Pasquale (1973). They coined the term "2 1/2-dimensional" to describe the geometry.
If the geometry of the causative body or bodies is specified, the 2 1/2-dimensional equations can be combined with observation of the gravity and magnetic anomaly fields to make linear least squares solutions for density and susceptibility or remanent magnetization.
A computer program is presented which performs, for one or more bodies, along a profile perpendicular to strike, both forward calculations for the magnetic and gravity anomaly fields and independent gravity and magnetic inverse calculations for density and susceptibility or remanent magnetization.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Calculation of gravity and magnetic anomalies along profiles with end corrections and inverse solutions for density and magnetization |
| Series title | Open-File Report |
| Series number | 77-463 |
| DOI | 10.3133/ofr77463 |
| Year Published | 1977 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | iii, 110 p. |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |