Forward Gravity Calculation from a Geosoft Voxel (NGAGLAYER)

Use the Gravity Response from Density Voxel option (NGAGLAYER GX) in the GM-SYS 3D Tools > Partial Calculations menu to calculate the gravity response of a 3D voxel grid at a specified observation elevation and output to a grid with the same X, Y dimensions as the 3D grid. The 3D grid is assumed to contain densities in g/cm3.

3D Gravity Forward Calculation - Voxel dialog options

Voxel to process

A 3-D grid containing densities in g/cm3.

Grid to save G in

A new 2-D grid to contain the calculated gravity response.

Observation elevation

The elevation at which the gravity response is calculated.

Application Notes

The calculation requires that the X- and Y-spacing in the 3D grid are equal. The output grid matches the horizontal dimensions of the input density 3D grid.

  • The observation (i.e., calculation) elevation can be inside the 3D grid. This calculation ignores the settings in the current 3D model, such as Background density and DC Shift.