@article{oai:nagoya.repo.nii.ac.jp:00011860,
 author = {後藤, 晶子 and Goto, Akiko and 村松, 武 and Muramatsu, Takeshi and 寺岡, 義治 and Teraoka, Yoshiji},
 journal = {名古屋大学加速器質量分析計業績報告書},
 month = {Mar},
 note = {The Toyama-river snakes in the southern part of Iida city. Many faults and crumbling steep cliffs exist in this area. Numerous buried trees were found in the Toyama-River area when the riverbed began to go down. The buried trees were laid on the bottom of the dammed-lake by the rock avalanche. We researched downstream area of the buried forest and dated some buried tree fragments. The rock avalanche is found in the both sides of the Toyama-River between Oshima and downstream of Shippei-jima. Our field survey suggests that the rock avalanche formed the dam higher than 50 m from the present streambed and blocked the river current. The lake sediment (6-7 m thickness) means the big lake existed and formed buried forest. For determination of the timing of landslide and dam formation by ^<14>C dating, we collected the buried tree fragments from the rock avalanche and lake sediment in addition to buried trees. The range of ^<14>C age is 573-852 cal AD in avalanche deposit and the sample in lake sediment is 337-771 cal AD. The buried trees show 415-809 cal AD along the Toyama-river. At the Ikeguch-river which is the branch of the Toyama-river, the buried trees age range is approximately 430-770 cal AD. We suggest that the dammed lake formed during 573-852 cal AD was triggered by huge landslide and caused buried forest. A Japanese cypress, which was found in the same area as our research, buried age has been estimated to be 714 AD by tree-ring dating. At just the same time, there was a huge earthquake (Totomi-Jishin) which yielded a quake of intensity of about 7 in the seismic center. Therefore, we suppose that the landslide-dammed lake of this study could be associated with the Totomi-Jishin at 714 AD and the lake length would be more than 3 km along the Toyama-river., 第20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19(2007)年度報告<第2部> Proceedings of the 20th symposiumon on Chronological Studies at the Nagoya University Center for Chronological Research in 2007 日時:平成20 (2008)年1月10日(木)～11日(金) 会場:名古屋大学野依記念学術交流館 Date:January10th-11th, 2008 Venue:Nagoya Uhiversity Noyori Conference Hall},
 pages = {99--102},
 title = {長野県南信濃,遠山川流域に分布する埋れ木の年代と古地変(第 20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19(2007)年度報告)},
 volume = {19},
 year = {2008}
}