The Transportable Array of USArray (http://www.iris.edu/USArray/), the seismological component of EarthScope (http://www.earthscope.org/), is producing an impressive database of seismological observations for use in exploring mantle structure beneath North America. By early 2010, USArrayTA had made its way into the Great Plains states, where the availability of seismic data was previously very sparse. In our previous papers (Burdick et al.2008, 2009) we presented 3-D tomographic models of mantle P-wavespeed from global and USArrayTA traveltime data through November 2007 and December 2008, respectively. Here we present a model update using additional USArrayTA data through...

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