The Catastrophic Tombi Landslide and Accompanying Landslide Dams Induced by the 1858 Hietsu Earthquake
Kimio Inoue*, Takahisa Mizuyama**, and Yukihiko Sakatani***
*Sabo Frontier Foundation, SABO-Kaikan Annex 6F, 2-7-4 Hirakawacho, Chiyoda-ku, Tokyo 102-0093, Japan
**Graduate School of Agriculture, Kyoto University, Kitashirakawa Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
***Tateyama Mountain Area Sabo Office, Ministry of Land, Infrastructure and Transport, Ashikuraji-Bunasaka 61, Tateyama Machi, Toyama 930-1406, Japan
In the Joganji River basin, huge volume of sediment has been carried downstream and has formed the alluvial fan. The sediment runoff (erosion) volume is assumed to be 1.2 × 1011 m3, accounting by the hypsometric curve of the Joganji River, which indicates the amount corresponding to rise in the mountains of the upstream, 1 mm/year at average, since the start of the quaternary period. The fast-flowing Joganji River originating on the Tateyama Volcano slope was, until the end of the Edo Period (1607-1867), relatively stable as indicated by boat services operating from the river mouth to the fan apex. The Hietsu earthquake on April 9, 1858, caused numerous sediment disasters along the Atotsugawa fault system, some of the sediment movements built up landslide dams. Especially the catastrophic Tombi Landslide (Tombi-Kuzure) in the Tateyama Caldera, the upstream of the Joganji River, was the largest in the earthquake. The volume of the Tombi Landslide is estimated 103-127 million m3, one of the largest movements in the world calculated the volume difference of the configuration and the landform before the landslide based on wide-ranging historical data. The landslide dam broke twice – on April 23, 14 days after the quake and June 7, 59 days after it –, generating a large-scale outburst flood and sediment deposition on the Joganji River’s alluvial fan. Considering the carbon (14C) dating for the years 220-320 of pieces of wood sample at some deposits along the upstream of the Joganji River, it suggests that major sediment movement may have occurred in the Hietsu earthquake. But the years 720-940 suggest that major sediment movement may have occurred previously. Topographicaly, such a huge landslide is part of the mountain range erosion and disintegration process, making it important to be able to predict potential sediment movement’s scale and form accurately enough to minimize disaster and to better understand the overall landslide occurrence topographical changes.
-  Central Disaster Management Council, On lessons learned from past disasters, “1858 Hietsu Earthquake,” 207p., 2009.***
-  K. Inoue, “Large Sediment-related Disasters,” 1858 Hietsu Earthquake, On lessons learned from past disasters, pp. 69-91, 2009.***
-  K. Inoue, T. Mizuyama, and S. Ouchi, “Huge Landslide “Tombi-Kuzure” in the upper stream of Joganji River and movement of river bed their after,” Proceedings of Japan Society of Erosion Control Engineering in 1986, pp. 12-15, 1986.***
-  T. Mizuyama, S. Ouchi, and K. Inoue, “Volume and movement of Tombi landslide,” Proceedings of Japan Society of Erosion Control Engineering in 1987, pp. 102-103, 1987.***
-  Miyagawa Village History Compilation Committee, “History of Miyagawa Village,” Complete History Vol.1 and 2, 1981.
-  H. Machida, “Erosional Development in the Torrential River – A Case Study of the River Joganji in Toyama Prefecture,” Geographical Review of Japan, Vol.35, pp. 157-174, 1962.**
-  T. Nozaki, M. Kometani, and S. Kikukawa, “Tonbidoro and Kunimidoro (preliminary Report) -Sediments derived from Two Gigantic Slope Failures in the Tateyama Caldera-,” Proceedings of 45th Japan Landslide Soceity, pp. 178-179, 2009.***
-  S. Ouchi and T. Mizuyama, “Volume and Movement of Tombi Landslide in 1858, Japan,” Transaction, Japanese Geomorphological Union, Vol.10, No.1, pp. 27-51, 1989.*
-  Records of Kawai Village Compilation Committee, “Records of Hida Kawai Village, Complete History,” 1225p., 1990.
-  Research Group for Quaternary Crustal Movement “Quaternary Crustal Movement Chart,” Research Center for Disaster Prevention, 1969.
-  A. N. Strahler, “Hypsometric (Area-Altitude) Analysis of Erosional Topography,” Geol. Soc. Am. Bull., Vol.63, pp. 1117-1142, 1952.
-  S. Tabata, T. Mizuyama, K. Inoue, and M. Sugiyama, “Sediment Movement Caused from the Tombi Landslide, by the 1858 Hietsu Earthquake (M7.0-7.1),” Journal of the Japan Society of Erosion Control Engineering, Vol.53, No.1, pp. 59-70, 2000.**
-  S. Tabata, T. Mizuyama, and K. Inoue, “Landslide dams and Disasters,” Kokon Shoin, 205p., 2002***
-  Tajimi Work Office, “Ontake Landslide and Debris Avalanche induced by the 1984 Earthquake at Mount Ontake,” p.12, 2002.*
-  Tajimi Work Office, “Ontake Landslide,” 296p., 2004.***
-  Toyama Local History Society, “Ecchu Ansei Daijishin Kembunroku – Tateyama Oh-Tombi Kuzure no Ki,” KNB Kosan, 231p., 1976.***
-  T. Usami, “Shimpen Nihon Higai Jishin Soran “Enlarged and Revised Edition 416-1995”,” 493p., 1996.***
- *in English, **in Japanese with English abstract, ***in Japanese