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\section{Calculating induced dynamic stress changes} pressure changes in the magma chamber}  \subsection{Model Setup}  We numerically estimate pressure changes induced in the magma chamber by a nuclear explosion.  We choose as a numerical tool PyLith, ``a finite-element code for dynamic and quasistatic simulations of crustal deformation, primarily earthquakes and volcanoes''\cite{Aagaard_2013}. This code's versatility in meshing and , element types and types of analyses. 
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