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

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Presentation on theme: "Shear velocity of olivine Data from Kumazawa & Anderson [1969] Seismic Anisotropy."— Presentation transcript:

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

2 Anisotropy of Polycrystaline Rocks Twin Sisters Dunite Babuska, 1972

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

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

5 Different Slip Systems Jung et al., 2006

6 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

7 Azimuthal Anisotropy: Pn anisotropy in oceanic lithosphere

8 Shear Wave Splitting

9 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

10  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]


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