Characterization of the magnetic fabric of rocks

Abstract

An inextensive system of magnetic susceptibility anisotropy factors is suggested which is sufficient in the majority of practical applications for characterizing the magnetic fabric of rocks. The system involves three newly devised factors: the corrected anisotropy degree, the shape factor and the difference shape factor. The first of these characterizes the quantity of anisotropy somewhat better than the commonly used anisotropy degree. The shape factor characterizes the quality of anisotropy i.e. the shape of the susceptibility ellipsoid, in a convenient way; its definition is based on a certain analogy between the anisotropy ellipsoid and the strain ellipsoid. The difference shape factor can replace the shape factor when only the differences between the principal susceptibilities are given while the mean susceptibility is unknown. © 1981.