Amartya Kattemalavadi, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, United States, Katherine Armstrong, Lawrence Berkeley National Lab, Berkeley, United States; University of California Santa Cruz, Santa Cruz, United States, Heidi Krauss, Michigan State University, Department of Earth and Environmental Science, East Lansing, MI, United States, Allen K McNamara, Michigan State University, Earth and Environmental Sciences, East Lansing, MI, United States, Barbara A Romanowicz, Univ California Berkeley, Earth and Planetary Science, Berkeley, United States; Berkeley Seismological Laboratory, UC Berkeley, Berkeley, United States, Carlos Tome, Los Alamos National Laboratory, Materials Science and Technology Division, Los Alamos, United States and Hans-Rudolf Wenk, Univ California Berkeley, Berkeley, CA, United States