*Valerie Shayne Vargas Olfindo¹、Betchaida Duetes Payot¹、Gabriel Theophilus Valera¹、Shoji Arai²、Tomoyuki Shibata⁴、Masako Yoshikawa³ (1.Rushurgent Working Group, National Institute of Geological Sciences, University of the Philippines、2.Department of Earth Sciences, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan、3.Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Beppu 874-0903, Japan、4.Department of Earth and Planetary Systems Science, Hiroshima University, Hiroshima 739-8526, Japan)