Shear velocity of olivine Data from Kumazawa & Anderson [1969] Seismic Anisotropy.

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Presentation transcript:

Shear velocity of olivine Data from Kumazawa & Anderson [1969] Seismic Anisotropy

Anisotropy of Polycrystaline Rocks Twin Sisters Dunite Babuska, 1972

Velocity Anisotropy - Twin Sisters Dunite Babuska, 1972 B - axesC - axes A - axesP velocities

Lattice Preferred Orientation - Relationship of anisotropy and strain Mainprice & Silver [1993]

Different Slip Systems Jung et al., 2006

Radial Anisotropy (Transverse Isotropy) Hexagonal symmetry with a vertical axis Vertical and horizontal propagating waves have different velocities Same velocity for all horizontal directions Studied using difference between Love (SH) and Rayleigh (SV) waves Ekstrom & Dziewonski, 1998

Azimuthal Anisotropy: Pn anisotropy in oceanic lithosphere

Shear Wave Splitting

Smith et al., [2001]  Seismic and Geochemical Evidence for Mantle Flow - Lau Helium isotope anomalies Shear wave splitting Mantle flow diagram After Turner and Hawkesworth, 1998

 Mariana Arc Shear Wave Splitting Rose Diagrams - plotted at station for sources in upper 250 km Spatial Averaging - for paths in the upper 250 km Pozgay et al. [2007]