A Bayesian method to quantify azimuthal anisotropy model uncertainties: application to global azimuthal anisotropy in the upper mantle and transition zone

Global azimuthal anisotropy in the transition zone.

Surface wave dispersion measurements for Love wave overtones carry evidence of azimuthal anisotropy in the transition zone of Earth's mantle (400 to 660 kilometers deep). A Backus-Gilbert inversion of anisotropic phase velocity maps, with resolution kernels mainly sensitive to the transition zone, shows a robust long-wavelength azimuthally anisotropic velocity structure. This observation puts n...

Depth dependent azimuthal anisotropy in the western US upper mantle

Variable azimuthal anisotropy in Earth's lowermost mantle.

A persistent reversal in the expected polarity of the initiation of vertically polarized shear waves that graze the D'' layer (the layer at the boundary between the outer core and the lower mantle of Earth) in some regions starts at the arrival time of horizontally polarized shear waves. Full waveform modeling of the split shear waves for paths beneath the Caribbean requires azimuthal anisotrop...

Origin of azimuthal seismic anisotropy in oceanic plates and mantle

Article history: Received 13 March 2014 Received in revised form 4 June 2014 Accepted 8 June 2014 Available online xxxx Editor: Y. Ricard

Inversion of teleseismic S particle motion for azimuthal anisotropy in the upper mantle: a feasibility study

We have developed a technique for the inversion of teleseismic S-waveforms in terms of azimuthal anisotropy in the upper mantle. We test different models of the Earth upper mantle by transforming the observed horizontal components into a synthetic vertical component and comparing this with the observed vertical component. The optimum model is found by minimizing the difference between the synth...