Online material: MIT P-wave tomography model for the United States created using travel-time residuals from the USArray Transportable Array from April 2004 to December 2008.

As the Transportable Array of USArray (http://www.iris.edu/USArray/), the seismology component of EarthScope (http://www.earthscope.org/), progresses eastward across the United States, the seismological database available for studies of mantle heterogeneity beneath the North American continent is rapidly expanding. Burdick et al. (2008) published a tomographic model of mantle heterogeneity beneath North America based on USArrayTA P-wave travel time data through November 2007. The purpose of this article is to...

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