Example of lithospheric and asthenospheric scale imaging achieved by surface wave analysis using Reference Network and USArray Transportable Array recordings. This is a cross section through a tomographic model for the North American upper mantle. The western United States is much better illuminated than the central and eastern United States because of data provided by USArray Transportable Array stations (red triangles). As the Transportable Array is fully deployed and migrates eastward, the entire lithosphere and asthenosphere under the contiguous United States will be imaged at high resolution. Courtesy of S. van der Lee.

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