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

• Published in: Active Fault Research Vol. 2007; no. 27; pp. 201 - 209
• Main Authors: Taniguchi, Kaoru, Kaneda, Heitaro, Sugito, Nobuhiko, Uchida, Chikara, Hirouchi, Daisuke, Hiramatsu, Takahiro, Yasue, Ken-ichi
• Format: Journal Article
• Language: Japanese
• Published: Japanese Society for Active Fault Studies 2007
• Subjects: Active fault; Atera fault zone; Paleoseismology; Tensho-earthquake; Trench survey; Yugamine fault; トレンチ調査; 古地震活動; 天正地震; 活断層; 湯ヶ峰断層; 阿寺断層帯
• ISSN: 0918-1024; 2186-5337
• DOI: 10.11462/afr1985.2007.27_201

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. We excavated a trench across the scarplet on the L 1 terrace at Obayashi district. 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.