REILINGER, Robert, Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave, 54-326, Cambridge, MA 02139 and MCCLUSKY, Simon, Dept. of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave, 54-812, Cambridge, MA 02139, reilinge@erl.mit.edu, reilinge@erl.mit.edu