Depth estimation methods should be selected according to the data quality and the nature of one's particular geologic problem. Magnetic depth estimation is a cost-effective and useful tool of quantitative interpretation and helps reduce exploration risk. To produce a reliable depth solution, the experience of an interpreter is important and other independent controls are necessary. This follows from an understanding of what the indicated depths might represent. Also, as a gradient calculation is usually involved, noise creates a spread of depth solutions. The new Cauchy derivatives by integration are stabilized and more precise. This stems from exploiting potential field holomorphic properties, which have largely been ignored in exploration geophysics. This leads to enhanced noise suppression and a more stable version of the signal in complex number form. Falcon airborne gravity gradiometer surveys may benefit from some of this work as well. Pade Approximation in conjunction with Cauchy methods leads to a coherent downward continuation of the magnetic field. Depth to basement, is now nuanced to include depth to weathering, depth to top/bottom of discreate magnetic sources.

Open-Access Online Publication: May 29, 2023