1. Hawai‘i Institute of Geophysics and Planetology School of Ocean and Earth Science and Technology University of Hawai‘i at Mānoa Honolulu Hawai‘i 906822 USA
2. Department of Earth and Planetary Sciences Harvard University and Harvard‐Smithsonian Center for Astrophysics Cambridge Massachusetts 02138 USA
3. Department of Earth, Atmospheric, and Planetary Sciences Purdue University West Lafayette Indiana 47907 USA
4. Department of Physics and Astronomy Purdue University West Lafayette Indiana 47907 USA