EarthScope is a proposed new earth science initiative that will dramatically advance our physical understanding of the North American continent by exploring its three-dimensional structure and changes in that structure through time. By integrating scientific information derived from geology, seismology, geodesy, and remote sensing, EarthScope will yield a comprehensive, time-dependent picture of the continent beyond that which any single discipline can achieve. Cutting-edge land- and space-based technologies will, for the first time, resolve earth's structure and measure deformation in real-time at continental scales. These measurements will permit us to relate processes in the earth's interior to their surface expressions, including...

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