Research in Geophysics at the University of Georgia specializes in the use of varied imaging techniques to deduce the structure of the crust and upper mantle. Rob Hawman uses seismograph arrays to investigate the structure of the crust and uppermost mantle; recent experiments have focused on the deep structure of the southern Appalachians. Erv Garrison uses radar, electrical and magnetic methods to examine shallow earth geophysics especially the at-or-near surface expression of fracturing/faulting as well as buried geohydrological features.