@article{oai:nagoya.repo.nii.ac.jp:00012813, author = {小嶋, 智 and 永田, 秀尚 and 近藤, 遼一 and 野崎, 保 and 鈴木, 和博 and 池田, 晃子 and 中村, 俊夫 and 大谷, 具幸 and Kojima, Satoru and Nagata, Hidehisa and Kondo, Ryoichi and Nozaki, Tamotsu and Suzuki, Kazuhiro and Ikeda, Akiko and Nakamura, Toshio and Ohtani, Tomoyuki}, journal = {名古屋大学加速器質量分析計業績報告書}, month = {Mar}, note = {Kiritani in Yatsuo Town, Toyama City, central Japan is located on a small flat basin along the Kubusu River surrounded by ridges about 500-700 m in altitude, south of the Toyama Plain. The ENE-WSW trending fault running near Kiritani village is the boundary between the Miocene Nirehara and Iwaine Formations to the north and the Tetori Group and the Funatsu Granite of Hida belt to the south. Many landslides 紅e developed within the area underlain by the Iwaine Formation composed of volcanic and volcaniclastic rocks. One of the landslides called Akakura block, about 1200 in width and in length, dammed the Kubusu River and the dammed lake was filled in to form the Kiritani flat basin. The landslide deposits exosed along the Kubusu River (the locality KI-l) include wood fragment and organic materials derived from wood fragments; the four samples yield the AMS ^<14>C age of 2535±31, 2521±25, 2531±25 and 2547±26 BP (standard deviation: 1 sigma). The ages are calibrated as the age range between 2500-2750 cal BP, most probably between 2500-2600 cal BP or 2700-2750 cal BP, which is the age of main phase of the landslide of the Akakura block having a long history of complicated sliding. We couldn't determine the inducing cause of the landslide from the geomorphological and geological information now obtained from this area. If the slide was caused by an earthquake, the Atotsugawa fault is the most probable candidate causing the trigger earthquake for this landslide on the basis of the recurrence interval and the latest event of the active fault. The plant remains in the uppermost part of the dammed lake sediments at the locality KI-2 and in the lake sediments (?) on the landslide mass at the locality KI-3 have the AMS ^<14>C ages of 129±29 and 135±46 BP, respectively. These sediments are probably related to the landslide in 1836 recorded in ancient documents, although the obtained ^<14>C ages are too young (less than 200 BP) for the accurate determination., 第21回名古屋大学年代測定総合研究センターシンポジウム平成20(2008)年度報告}, pages = {58--70}, title = {富山市八尾町桐谷の地すべり堆積物中に含まれる植物遺体の14C 年代}, volume = {20}, year = {2009} }