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Azimuthal anisotropy like transverse isotropy
on its side
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D? Anisotropy

• Lattice-Preferred Orientation (LPO)?
• Shape-Preferred Orientation (SPO)?
• Result of a Chemical Boundary Layer?
• Related to Slabs?

McNamara, van Keken, and Karato 2002
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D? Anisotropy

• Often most intense at the top of D?.
• Most always with SH faster than SV (?
  transverse isotropy)
• Shows large lateral variation.
• Often associated with the D? discontinuity.

Fouch et al. 2001
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