Rene Gassmoeller, University of California Davis, Earth and Planetary Sciences, Davis, United States, Juliane Dannberg, University of California Davis, Department of Earth and Planetary Sciences, Davis, CA, United States, Wolfgang Bangerth, Colorado State University, Department of Mathematics, Fort Collins, CO, United States, Timo Heister, Clemson University, Clemson, SC, United States and Robert Myhill, University of Bristol, School of Earth Sciences, Bristol, United Kingdom