Keith D. Koper and Yan Xu Department of Earth and Atmospheric Sciences Saint Louis University, St. Louis, MO 63108, USA Using IMS Seismic Arrays to Constrain the Structure of Earth’s Deep Interior Determining Topography on the Boundaries of the Liquid Core (Koper et al. (2003), JGR, 108, doi:10.1029/2002JB001995 ) Constraining the Density Jump at the Inner Core Boundary (Koper and Pyle (2004), JGR, 109, doi:10.1029/2003JB002750; Koper and Dombrovskaya (2005), EPSL, 237, 680-694 ) Imaging Scatterers in the Inner Core ( Koper and Pyle (2004), JGR, 109, doi:10.1029/2003JB002750; Leyton and Koper (2007), JGR, 112, doi:10.1029/2006JB004370 )