*Charline Lormand¹、Georg F Zellmer¹、Naoya Sakamoto²、Geoff Kilgour³、Teresa Ubide⁴、Hisayoshi Yurimoto²、Alan Palmer⁵、Karoly Nemeth¹、Yoshiyuki Iizuka⁶、Anja Moebis⁵ (1.School of Agriculture and Environment, Volcanic Risk Solutions, Massey University, PO Box 11222, Palmerston North 4442, New Zealand、2.Isotope Imaging Laboratory, Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan、3.GNS Science, Wairakei Research Centre, Private Bag 2000, Taupo 3352, New Zealand、4.School of Earth and Environmental Sciences, The University of Queensland, Brisbane, QLD 4072, Australia 、5.School of Agriculture and Environment, Department of Soil Science, Massey University, PO Box 11222, Palmerston North 4442, New Zealand 、6.Institute of Earth Sciences, Academia Sinica, 128 Academia Road Sec. 2, Nankang, Taipei 11529, Taiwan)