The "Theoretical & Computational Seismology" group is working on developing and improving various techniques for modeling regional- and global-scale geophysical processes. Normal-mode analysis is used to constrain the global, 3-D structure of the Earth. Finite-element methods (FEM) are used to study medium-scale structures and processes, such as post glacial rebound. Finally, spectral-element methods (SEM) are used to solve the forward problem of seismic wave propagation with high accuracy. All these techniques involve large computations that are performed on a "Beowulf" PC cluster.