TXT-tool 4.081-1.2: Mechanism of the Aratozawa Large-Scale Landslide Induced by the 2008 Iwate-Miyagi Earthquake
A large-scale landslide near the Aratozawa dam reservoir was occurred when the 2008 Iwate-Miyagi Nairiku earthquake with magnitude of 7.2 hit the area of Mount Kurikoma in Miyagi Prefecture of Japan. The epicenter of the earthquake was located about 10 km northeast part of Mount Kurikoma, at the border between Miyagi Prefecture and Iwate Prefecture. This paper highlights site investigation and sampling of the Aratozawa landslide, following with the laboratory experiment by means of undrained dynamic loading ring shear apparatus. In addition, to understand the initiation mechanism, landslide simulation using the LS-RAPID model was carried out. By combining the ring shear test results and LS-RAPID, the Aratozawa landslide process from pre-failure state, failure initiation, post-failure motion up to deposition stage are well described. The result of this study contributes to the landslide hazard assessment, particularly for the case of landslides near reservoir where earthquake, rainfall and or reservoir impoundment are considered as single or combined triggering factors.
KeywordsEarthquake-triggered landslide Aratozawa reservoir Ring shear tests LS-RAPID model
The assistance from Japan Conservation Engineering and Japan Forestry Agency is gratefully acknowledged. The authors would like to thank Kawanami Akiko from Ministry of Agriculture, Forestry and Fisheries of Japan for her kind assistance during site investigation. This landslide research is supported by the Global Survivability Studies Program of Kyoto University (A Leading Graduate School Program of MEXT). The undrained ring shear apparatus ICL-2 version is developed by the International Consortium on Landslides (ICL) as a part of SATREPS (Science and Technology Research Partnership for Sustainable Development Program of the Government of Japan) for Vietnam project in 2012–2017.
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