Azimuthal Anisotropy of the North American Upper Mantle Based on Full Waveform Inversion

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...

Depth dependent azimuthal anisotropy in the western US upper mantle

Three-dimensional radial anisotropic structure of the North American upper mantle from inversion of surface waveform data

S U M M A R Y Seismic anisotropy provides insight into palaeo and recent deformation processes and, therefore, mantle dynamics. In a first step towards a model for the North American upper mantle with anisotropy characterized by a symmetry axis of arbitrary orientation, aimed at filling the gap between global tomography and SKS splitting studies, we inverted long period waveform data simultaneo...

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...

Azimuthal seismic anisotropy in the Earth’s upper mantle and the thickness of tectonic plates

S U M M A R Y Azimuthal seismic anisotropy, the dependence of seismicwave speeds on propagation azimuth, is largely due to fabrics within the Earth’s crust and mantle, produced by deformation. It thus provides constraints on the distribution and evolution of deformation within the upper mantle. Here, we present a new global, azimuthally anisotropic model of the crust, upper mantle and transitio...