Challenges for a 3-D anelastic attenuation structure from multi-mode surface waves with nonlinear waveform analysis

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For the reconstruction of high-resolution attenuation structure of the upper mantle, surface wave phase and amplitude data are collected using recent high-density seismic networks in continental regions. A preliminary surface-wave attenuation model of North America revealed the high attenuation beneath western US(incl. hotspot and rift zone), whereas low attenuation is seen beneath stable cratons and plateau, suggesting clear correlation between the velocity and attenuation structures on a large scale. Furthermore, refined shear velocity models in continental regions revealed anomalously strong radial anisotropy beneath LAB of central Australia, which is likely to be caused by the strong shear beneath the fast moving Australian plate.