Acknowledgements

This work has been financially supported by the National Science Foundation as part of EarthScope (Grant EAR-0345481).

We are grateful to the IRIS Data Management Center (DMC) as well as to the Geological Survey of Canada for providing waveform data used in this study.

Figure 13.46: Horizontal slices at different depths through our 3D radial anisotropic model - Top: Perturbations in the isotropic S-velocity structure. Anomalies are relative to average - Bottom: Perturbations in the anisotropic parameter $\xi $. Anomalies are relative to isotropy.
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