Tephrochronology of Late Quaternary Strath Terraces and Their Implications to Neotectonic Movements in The Shitada and Tochio Regions of the Niigata Basin, Central Japan

摘要

Late Quaternary strath terraces younger than 50ka were investigated in the Shitada (Ikarashi River) and Tochio (Kariyada River) regions, central eastern margin of the Niigata Basin, in order to clarify their chronology and implications to neo- tectonic movements. The terraces were classified based on geomorphologic configur- ation and tephro-stratigraphic relation between marker tephra horizons and the terraces.