Field Investigation of Geotechnical Hazards Due to Earthquake, 2006 JGS (Japanese Geotechnical Society) Survey Team at Merapi Volcano. Right to left : Yosimine Mitsutoshi (Tokyo Metro. Univ), Yanyan Agustian (Yamanashi Univ), Koseki Junichi (Tokyo Univ), Satoshi Goto (Yamanashi Univ), Tadashi Kiyota (Tokyo Univ) and Ruta Ireng Wicaksono (Tokyo Univ). Field Investigation