Sylvia Dee, Rice University, Department of Earth, Environmental, and Planetary Sciences, Houston, TX, United States, Yuko Okumura, University of Texas at Austin, Institute for Geophysics, Austin, TX, United States, Samantha Stevenson, University of California Santa Barbara, Santa Barbara, CA, United States and Pedro N DiNezio, University of Hawai'i at Manoa, Honolulu, HI, United States