Michael Floyd, Massachusetts Institute of Technology, Cambridge, MA, United States, Gareth Funning, University of California, Riverside, Department of Earth and Planetary Sciences, Riverside, CA, United States, Rachel L Terry, University of California Riverside, Riverside, CA, United States, Yuri A Fialko, Univ California San Diego, La Jolla, CA, United States and William C Hammond, Nevada Geodetic Laboratory, Nevada Bureau of Mines and Geology, University of Nevada - Reno, Reno, NV, United States