Shear velocity of olivine
description
Transcript of Shear velocity of olivine
Seismic Attenuation and Earth Structure
Shear velocity of olivineData from Kumazawa & Anderson [1969]Seismic Anisotropy1Anisotropy of Polycrystaline RocksTwin Sisters Dunite
Babuska, 19722Velocity Anisotropy - Twin Sisters DuniteBabuska, 1972
B - axesC - axesA - axesP velocities3
Lattice Preferred Orientation - Relationship of anisotropy and strainMainprice & Silver [1993]4Different Slip Systems
Jung et al., 20065Radial Anisotropy (Transverse Isotropy)Hexagonal symmetry with a vertical axisVertical and horizontal propagating waves have different velocitiesSame velocity for all horizontal directionsStudied using difference between Love (SH) and Rayleigh (SV) waves
Ekstrom & Dziewonski, 1998Azimuthal Anisotropy: Pn anisotropy in oceanic lithosphere
7Shear Wave Splitting
Smith et al., [2001] Seismic and Geochemical Evidence for Mantle Flow - Lau
Helium isotope anomaliesShear wave splittingMantle flow diagramAfter Turner and Hawkesworth, 19989 Mariana Arc Shear Wave SplittingRose Diagrams - plotted at station for sources in upper 250 kmSpatial Averaging - for paths in the upper 250 kmPozgay et al. [2007]
10