Sponsored by the National Nuclear Security Administration, Office of Nonproliferation Research and Development, Office of Defense, Nuclear Nonproliferation. Contract No. DE-FC52-06NA27324. We thank Jeff Stevens for discussions regarding vanishing tractions at the free surface, Howard Patton for insights on the CLVD contribution to the explosion source, and Bruce Julian for the code to make the source-type plots. Figures were made with Generic Mapping Tools (Wessel and Smith, 1998).

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