*Andhika Nugraha¹、Tsukasa Ohba¹、Takashi Hoshide¹、Indranova Suhendro^2,3、Muhammad Andriansyah Gurusinga^4,5、Gabriela Nogo Retnaningtyas Bunga Naen⁴ (1.Petrology and Volcanology Laboratory, Graduate School of International Resource Sciences, Akita University、2.Department of Environmental Geography, Faculty of Geography, Universitas Gadjah Mada、3.Center for Disaster Studies, Universitas Gadjah Mada、4.Center for Regional Revitalization in Research and Education, Akita University、5.Department of Geological Engineering, Faculty of Mineral Technology, Universitas Pembangunan Nasional “Veteran” Yogyakarta)