*Gabriela Nogo Retnaningtyas Bunga Naen¹, Atsushi Toramaru¹, Tomoharu Miyamoto¹, Haryo Edi Wibowo² (1.Department Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan, 2.Geological Engineering Departement, Universitas Gadjah Mada, Yogyakarta, Indonesia )