1. A method of simultaneously determining multiple parameters or a parameter distribution characterizing material properties of a volume of a subterranean formation under investigation using an inversion process of sparse measurements, the method comprising: performing a potential field survey of the volume of the subterranean formation using sensors located around or within the volume; defining a model of said volume and modifying said model by matching said multiple parameters or parameter distribution characterizing material properties with said measurements of the effects of the potential field using alternatingly an iterative inversion method and a probabilistic inversion method; and determining said multiple parameters or parameter distribution characterizing material properties after one or more iterations of said alternating inversions wherein a pseudo-converged model obtained after one or more iterations of an inversion is transformed and the transformed model of the inversion is used as an input model for a successive inversion.