UCLA, Department of Earth and Space Sciences, 595 Charles E. Young Dr East, Los Angeles, CA 90095-1567, USA
Earth and Ocean Sciences, University of British Columbia, 6339 Stores Road, Vancouver, BC V6T 1Z4 Canada; Institute of Geophysics and Planetary Physics, Scripps Institution of Oceanography, 8602 La Jolla Shores Drive, La Jolla, CA 92037, USA
UCLA, Department of Earth and Space Sciences, 595 Charles E. Young Dr East, Los Angeles, CA 90095-1567, USA; Institute of Geophysics and Planetary Physics, 595 Charles E. Young Dr East, Los Angeles, CA 90095, USA