Subsurface structure analysis of gravity and magnetic anomalies in northern Hokkaido using Poisson's equation

The Poisson's equation expresses a linear relationship between the gravity and magnetic potentials arising from a body with uniform density and magnetization contrast. The equation was extended to multi body case by repeatedly applying it within a small uniform body called the moving window. The moving-window Poisson's (MWP) analysis technique was proposed by Chandler et al. (1981) to apply to general complex structures. The correlation coefficient between the total magnetic intensity anomaly reduced to the pole and vertical derivative of the gravity anomaly, and the magnetization-to-density ratio were obtained by the MWP analysis. We investigated the profiles of these parameters for synthetic multi density and magnetic intensity structures and clarified how structure boundaries are delineated. The MWP was applied to the dataset of gravity anomalies and magnetic intensity anomalies collected in Northern Hokkaido. As the result, the MWP analysis put some constraints on density and magnetization structures modeled by a conventional analytical method such as the Talwani method