Title: Downward continuation and transformation of total-field magnetic anomalies into magnetic gradient tensors between arbitrary surfaces using multilayer equivalent sources
Authors: Boxin Zuo, Xiangyun Hu*, Marcelo Leão-Santos, Lizhe Wang, Yi Cai
Source: Geophysical Research Letters，Volume 47, Issue 16，28 August 2020
DOI: 10.1029/2020GL088678
Link: https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2020GL088678
Abstract:
The equivalent source method offers a potential means for continuing and manipulating magnetic data between arbitrary surfaces. However, it ultimately suffers from a limited continuation distance and significant errors, which restrict its applicability in practice. To address this problem, we reformulate the equivalent source method with a partial differential equation framework. A multilayer equivalent susceptibility method is innovatively derived based on this approach. The location of equivalent sources is designed for adaptive estimation through the inverse procedure. We introduce nonlinear optimization, regularization, and constraining technologies in inversion to improve the stability and accuracy of the solution. Synthetic, real airborne, and ground data are tested in experiments. The results show that the new method significantly improves the capability and accuracy of the downward continuationand transformation of irregularly located data between arbitrary undulating surfaces.
