Abstract: Seismological constraints on the structure of the cratonic lithosphere are key to understanding its properties, origin and evolution. Using a combination of long period surface waveforms and SKS splitting measurements that benefit in particular from the EarthScope USArray TA deployment, we have developed a 3-D upper-mantle model of North America that includes isotropic shear velocity Vs, radial anisotropy ?, and 2-? azimuthal anisotropy. Combining these results, we infer several key features of lithosphere and asthenosphere structure:
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