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Timing of the Landslide-Dammed Lake Triggered by Earthquake, at Toyama River, Central Japan

Published online by Cambridge University Press:  18 July 2016

Akiko S Goto ,
Takeshi Muramatsu  and
Yoshiji Teraoka
Akiko S Goto*
Affiliation:
Center for Chronological Research, Nagoya University, Furo-cyo, Chikusa-ku, Nagoya, Aichi 464-8602, Japan. Present address: Department of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
Takeshi Muramatsu
Affiliation:
Iida City Museum, 2-655-7 Oute-machi, Iida, Nagano 395-0034, Japan
Yoshiji Teraoka
Affiliation:
Iida City Museum, 2-655-7 Oute-machi, Iida, Nagano 395-0034, Japan
*
Corresponding author. Email: akigoto@tmu.ac.jp
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Abstract

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Huge landslides triggered by strong earthquakes or torrential rains can result in unstable natural dams that pose serious risks to humans. In this study, we attempt to document the age of an ancient earthquake that produced a landslide-dammed lake. A buried forest found in the Toyama River area of the southern Nagano Prefecture, central Japan, provides evidence of this event. The dammed lake formation has been previously estimated to have occurred in AD 714. However, the age of the dam and the way it was formed have never been directly determined. To determine the position and timing of the landslide dam, we analyzed the radiocarbon content of branches and wood fragments from a brecciated deposit. We show that the 14C dating method is suitable for clarifying the timing of burial for a variety of trees, although the method does not produce a narrow age for the event. In addition to the dating, we determined the landslide dam's position and reconstructed the formation of the lake.

Type
Freshwater and Groundwater
Information
Radiocarbon , Volume 52 , Issue 3: 20th Int. Radiocarbon Conference Proceedings , 2010 , pp. 1090 - 1097
Copyright
Copyright © 2010 by the Arizona Board of Regents on behalf of the University of Arizona 

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