Full-wave multiscale anisotropy tomography in Southern California
Journal
Geophysical Research Letters
Journal Volume
41
Journal Issue
24
Pages
8809
Date Issued
2014-12-28
Author(s)
Zhao, Li
Abstract
©2014. American Geophysical Union. All Rights Reserved. Understanding the spatial variation of anisotropy in the upper mantle is important for characterizing the lithospheric deformation and mantle flow dynamics. In this study, we apply a full-wave approach to image the upper-mantle anisotropy in Southern California using 5954 SKS splitting data. Three-dimensional sensitivity kernels combined with a wavelet-based model parameterization are adopted in a multiscale inversion. Spatial resolution lengths are estimated based on a statistical resolution matrix approach, showing a finest resolution length of ~25 km in regions with densely distributed stations. The anisotropic model displays structural fabric in relation to surface geologic features such as the Salton Trough, the Transverse Ranges, and the San Andreas Fault. The depth variation of anisotropy does not suggest a lithosphere-asthenosphere decoupling. At long wavelengths, the fast directions of anisotropy are aligned with the absolute plate motion inside the Pacific and North American plates. Key Points A new full-wave anisotropic tomography is applied to Southern CaliforniaThe multiscale inversion achieves naturally data-adaptive spatial resolutionsSpatial variations of anisotropy correlate well with tectonic features
Subjects
full-wave sensitivity kernel | multiscale tomography | seismic anisotropy | Southern California
Publisher
AMER GEOPHYSICAL UNION
Type
journal article
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