*Nyora Donald Kobare^1,2、 Irwan Iskandar²、Suryantini Suryantini ²、Koki Kashiwaya¹、Katsuaki Koike¹ (1.Environmental Geosphere Engineering Laboratory, Department of Urban Management, Graduate School of Engineering, Kyoto University, Katsura C1-2, Kyoto 615-8540, Japan.、2.Geothermal Engineering Master’s Program, Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132, Indonesia)