Apparent Density Calculation (DENS)

Use the Apparent Density Calculation option to apply an apparent density calculation filter.

Apparent Density Calculation dialog options

Thickness of model layer	Thickness, in ground units, of the Earth model (t).
Background density	Background density in g/cm3 to be added to the density-contrast map. The default is 0, which means the density map is relative to the average density.

Application Notes

Apparent density mapping assumes a simple model layer of fixed thickness and varying density to explain an observed gravity field. The response is assumed to be caused by a collection of vertical, square-ended prisms of infinite depth extent, whose horizontal dimensions are equal to the input grid‑cell size. This is an idealized approximation—hence the term apparent.

It is highly recommended to downward-continue the data to a point close to the top surface of the source model using the CNDN filter operator.

Apparent Density Calculation

Where:

G	Gravitational constant.
t	Thickness, in ground units, of the Earth model.

Wavenumber Domain Variable Definitions

The following variables are used in the wavenumber domain:
k	Wavenumber increment, used to depict a radially symmetrical variable.	Where: np: number of points cs: cell size
μ	X-component of the wavenumber.
v	Y-component of the wavenumber.
r	Radial component of the wavenumber.
θ	Angular (polar) component of the wavenumber.