Transcript Slide 1

Anisotropy
Vocabulary 1
Isotropy
ahy-saht-trah-pee
ahy-so-troh-pee
Isotropic
ahy-suh-trahp-ik
ahy-so-troh-pik
Vocabulary 2
Anisotropy
an-ahy-saht-trah-pee
an-ahy-so-troh-pee
Anisotropic
an-ahy-suh-trahp-ik
an-ahy-so-troh-pik
Isotropy vs anisotropy
Some Minerals
Generalization
Isotropic Constitutive Equation
Basic Types of Anisotropy
• Transverse Isotropy
• Azimuthal anisotropy
• Composite (cracks)
Causes of Anisotropy
• Lattice Preferred Orientation (LPO)
– Alignment of mineral grains
• Shape Preferred Orientation (SPO)
– Alignment of heterogenieties
• Cracks
• Melt lenses
Transverse Isotropy
Transverse Isotropy
Love – Rayleigh Discrepancy
Azimuthal Anisotropy
“Azimuthal” anisotropy: like transverse isotropy on its side
Azimuthal Anisotropy
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]