*Jian Li^1,2, Jianxin Liu^1,2, Yasuo Ogawa³, Rongwen Guo^1,2, Yongfei Wang¹, Gangqiang Yang¹ (1.Central South University, School of Geosciences and Info-Physics, Changsha, China, 2.Central South University, Hunan Key Laboratory of Nonferrous Resources and Geological Hazards Exploration, Changsha, China, 3.Tokyo Institute of Technology, Volcanic Fluid Research Center, Tokyo, Japan)