Brian C Chandler, University of California Berkeley, Department of Earth and Planetary Science, Berkeley, CA, United States; Lawrence Berkeley National Laboratory, Berkeley, CA, United States, Joel Vincent Bernier, Lawrence Livermore National Laboratory, Livermore, CA, United States, Matthew R Diamond, University of California Berkeley, Berkeley, CA, United States, Hans-Rudolf Wenk, Univ California Berkeley, Berkeley, CA, United States and Martin Kunz, Lawrence Berkeley National Lab, Berkeley, CA, United States