Matthew G Jackson, University of California Santa Barbara, Earth Science, Santa Barbara, CA, United States, Janne Blichert-Toft, Lab Geologie de Lyon, Lyon Cedex 07, France, Saemundur A Halldorsson, SIO-UCSD, La Jolla, CA, United States, Lori N Willhite, University of California Santa Barbara, Santa Barbara, CA, United States, Mark D Kurz, WHOI, Woods Hole, MA, United States, Kresten Breddam, National Institute of Radiation Protection, Copenhagen, Denmark, Ilya Bindeman, University of Oregon, Earth Sciences, Eugene, OR, United States, Sunna Harðardóttir, University of Iceland, NordVulk, Institute of Earth Sciences, Reykjavik, Iceland and Allison Price, UC Santa Barbara, Santa Barbara, CA, United States