Mechanism of two rapid and long-runout landslides in the 16 April 2016 Kumamoto earthquake using a ring-shear apparatus and computer simulation (LS-RAPID) |
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| Authors: | Khang Dang Kyoji Sassa Hiroshi Fukuoka Naoki Sakai Yuji Sato Kaoru Takara Lam Huu Quang Doan Huy Loi Pham Van Tien Nguyen Duc Ha |
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| Institution: | 1.International Consortium on Landslides,Kyoto,Japan;2.VNU University of Science,Vietnam National University,Hanoi,Vietnam;3.Research Institute for Natural Hazards and Disaster Recovery,Niigata University,Niigata,Japan;4.National Research Institute for Earth Science and Disaster Resilience,Ibaraki,Japan;5.GODAI Development Corporation,Kanazawa,Japan;6.Disaster Prevention Research Institute,Kyoto University,Kyoto,Japan;7.Institute of Transport Science and Technology,Hanoi,Vietnam |
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| Abstract: | Around hundred landslides were triggered by the Kumamoto earthquakes in April 2016, causing fatalities and serious damage to properties in Minamiaso village, Kumamoto Prefecture, Japan. The landslides included many rapid and long-runout landslides which were responsible for much of the damage. To understand the mechanism of these earthquake-triggered landslides, we carried out field investigations with an unmanned aerial vehicle to obtain DSM and took samples from two major landslides (Takanodai landslide and Aso-ohashi landslide) to measure parameters of the initiation and the motion of landslides. A series of ring-shear tests and computer simulations were conducted using a measured Kumamoto earthquake acceleration record from KNet station KMM005, 10 km west of Aso-ohashi landslide. The research results supported our assumed mechanism of sliding-surface liquefaction for the rapid and long-runout motion of these landslides. |
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