Holocene faulting on the Yugamine fault of the Atera fault zone, central Japan

Hirouchi, Daisuke*; Yasue, Kenichi; Uchida, Chikara*; Hiramatsu, Takahiro*; Taniguchi, Kaoru*; Sugito, Nobuhiko*; Kaneda, Heitaro*

The Yugamine fault, 10 km in length, is in the north-central part of the Atera fault zone. We studied Holocene activity of the Yugamine fault through a trenching survey. Some humic layers and fluvial gravels are exposed on the trench walls. The Yugamine fault has cut through these layers to form a linear depression on its NE side. From the structural evidence along the fault plane and angular unconformity, we recognize at least four faulting events in this trench.