東部インドネシアには，太平洋プレートとオーストラリアプレートの相対運動に起因する大規模な左横ずれ断層帯が発達する．この断層帯の地震地質学的な情報は限られており，地震災害軽減の大きな障壁となっていた．本研究では，スラウェシ島やバンダ弧の島々において，変動地形調査・古地震調査・物理探査を行った．各調査地域で詳細な活断層分布図を作成し，断層の変位速度や平均活動間隔，最近の大地震の時期を明らかにした．その結果，将来起こりうる地震の規模が推定され，また近い将来に地震が発生する可能性の高い地域が見いだされた． / In eastern Indonesia, the relative motion between the Pacific and Australian plates is accommodated by a large left-lateral strike-slip fault system. The lack of geologic information on the fault system has been a significant barrier to understanding the seismic hazard posed by this fault system. This study integrates tectonic geomorphic, paleoseismic, and shallow geophysics investigations to uncover the faulting and seismic behavior of the fault system, focusing on central Sulawesi and the northern Banda Arc. This study provides detailed active fault map of each investigated area and clarifies slip rates, average recurrence interval, and timing of the recent large earthquakes. This study also estimates the seismic potential of the active faults and highlights the areas with a high possibility of hosting large earthquakes in the future. / 博士(理学) / Doctor of Philosophy in Science / 同志社大学 / Doshisha University