Gravity Anomaly Modeling with Equivalent Sources in Earth's Polar Regions

An improved method for gravity anomaly transformation, accounting for the Earth's spheroidal shape, has been developed based on modeling the field using equivalent sources (point masses). The values of the point masses are determined by solving a system of linear algebraic equations using the least squares method. A regularized singular value decomposition (SVD) method can also be applied for this purpose. Both approaches ensure stable computation of transforms in the Earth's high-latitude regions, as demonstrated by the presented results for the area with coordinates 54°–72° N, 84°–132° E, which includes the Siberian Platform and surrounding structures.