Lateral Susceptibility Inversion

The Lateral Susceptibility Inversion function optimizes the lateral susceptibility distribution in the selected model layer, in order to minimize the misfit for the selected magnetic anomaly component.

Perform a Lateral Susceptibility Inversion

On the Calculate menu, select Lateral Susceptibility Inversion. The Lateral Susceptibility Inversion dialog appears.
This dialog can also be accessed by right-clicking the model layer on the Layers tab of the Model Explorer and selecting Lateral Susceptibility Inversion.
From the dropdown list, select the Top Surface of Inversion Layer. The layer's corresponding lateral susceptibility distribution will be altered.
Enter a Maximum Number of Inversion Iterations. Inversion process will stop after this many iterations, even if the convergence target has not been reached.
Enter the Maximum Number of Taylor Series terms. This should be odd number less than 12. Higher values put moreemphasis on short wavelengths. More than 5 iterations are seldom useful.
Enter the Convergence Limit in μcgs, if possible . Inversion will stop when either the mean error or the standard deviation of the error is less than this limit. Note that under certain conditions, the calculations may not converge at all. The algorithm attempts to detect this and terminate accordingly.
Enter the Lower High-Cut Limit. A cosine roll-off high cut filter is applied to the error before inverting. This is the beginning of the cosine taper. The default value is equivalent to 0.5 times the Nyquist.
Enter the Upper High-Cut Limit. This is the short wavelength end of the taper. The default is the wavelength equivalent to 0.7 times the Nyquist. If you enter numbers that are <= 1.0, they are interpreted as fractions of Nyquist. If you enter numbers that are > 1.0, they will be interpreted as wavelengths (distances) in ground units.
Enter the Z0. This is the downward continuation depth relative to sea level. This level should be above the highest elevation you expect in the inverted structure. If Z0 is too deep, the inversion will fail to converge. The default value is the magnetic survey elevation.
Enter the DC. This is the mean depth of the resulting inverted surface relative to sea level, which must be deeper than Z0. The default value is the mean of the selected layer's relief surface. If the inversion is triggered from the layer context menu, the default is calculated from the selected layer's relief surface and displayed; otherwise "*" is displayed to indicate that it will be calculated during the inversion.
Enter the Regional Offset. This constant will be subtracted from the observed gravity before inverting.
Browse to the Constraints Grid. This controls where the inversion surface may change. Values of 0 indicate no change; 1 indicates maximum change.
Click Yes to continue.
If prompted, click Yes to recalculate. The calculation is processed.