*Deris Hendriawan¹、Kotaro Yonezu¹、Mega Fatimah Rosana²、Noor Cahyo Dwi Aryanto³ (1.Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University、2.Faculty of Geological Engineering, Padjadjaran University, Bandung, Indonesia、3.Marine Geological Institute, Agency for R&D of Energy and Mineral Resources, Indonesia)