Full-wave effects on shear wave splitting
Journal
Geophysical Research Letters
Journal Volume
41
Journal Issue
3
Pages
799
Date Issued
2014-02-16
Author(s)
Abstract
Seismic anisotropy in the mantle plays an important role in our understanding of the Earth's internal dynamics, and shear wave splitting has always been a key observable in the investigation of seismic anisotropy. To date the interpretation of shear wave splitting in terms of anisotropy has been largely based on ray-theoretical modeling of a single vertically incident plane SKS or SKKS wave. In this study, we use sensitivity kernels of shear wave splitting to anisotropic parameters calculated by the normal-mode theory to demonstrate that the interference of SKS with other phases of similar arrival times, near-field effect, and multiple reflections in the crust lead to significant variations of SKS splitting with epicentral distance. The full-wave kernels not only widen the possibilities in the source-receiver geometry in making shear wave splitting measurements but also provide the capability for tomographic inversion to resolve vertical and lateral variations in the anisotropic structures. Key Points Full-wave effects lead to complexities in splitting intensity Our method widens the range of source-receiver geometry in splitting analysis Full-wave kernels enable 3-D imaging of anisotropy structures ©2014. American Geophysical Union. All Rights Reserved.
Subjects
full-wave sensitivity kernel | seismic anisotropy | shear wave splitting
Publisher
AMER GEOPHYSICAL UNION
Type
journal article
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