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Susceptibility anisotropy ellipsoids:
  * a) sphere ($k_1=k_2=k_3$); radius in all three directions is the same
  * b) oblate ellipsoid ($k_1 < k_2 ≈ k_3$); radius in one direction is shorter ("flat pill")
  * c) prolate ellipsoid ($k_1 > k_2 ≈ k_3$); radius in one direction is longer ("needle")
  * d) triaxial ellipsoid ($k_1 \neq k_2 \neq k_3$); the radius is different in all directions (e.g. similar to a "surfing board")

The drawing is based on: [[https://books.google.co.uk/books?id=BHgOwNCGbnAC|Harsh Gupta (ed.), Encyclopedia of Solid Earth Geophysics, Springer Science & Business Media, 2011, ISBN 9789048187010]]

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{{tag> Types_of_ellipsoids Anisotropy_of_susceptibility Sphere Oblate_ellipsoid Prolate_ellipsoid Triaxial_ellipsoid Files}}