Online material: P-wave tomography model for the United States; scripts for plotting cross-sections.

In 2011, the Transportable Array of USArray (http://www.iris.edu/USArray/), the seismological component of EarthScope (http://www.earthscope.org/), continued to extend east of the Rocky Mountains and the Great Plains and into the Midwest and Gulf Coast regions where not many routinely processed data were available for previous regional- or global-scale traveltime inversions. In previous papers (Burdick et al.2008, 2009, 2010) we presented 3-D tomographic models of mantle P-wavespeed from global and USArrayTA traveltime data through November 2007, December 2008,...

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