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1-D inversion analysis of a shallow landslide triggered by the 2018 Eastern Iburi earthquake in Hokkaido, Japan
| Title: | 1-D inversion analysis of a shallow landslide triggered by the 2018 Eastern Iburi earthquake in Hokkaido, Japan |
| Authors: | Kameda, Jun Browse this author | | Okamoto, Atsushi Browse this author |
| Keywords: | 2018 Hokkaido Eastern Iburi earthquake | | Shallow landslide | | Inversion analysis |
| Issue Date: | 26-May-2021 |
| Publisher: | Springer |
| Journal Title: | Earth planets and space |
| Volume: | 73 |
| Issue: | 1 |
| Start Page: | 116 |
| Publisher DOI: | 10.1186/s40623-021-01443-y |
| Abstract: | Destructive landslides were triggered by the 6.7 M-w Eastern Iburi earthquake that struck southern Hokkaido, Japan, on 6 September 2018. In this study, we carried out 1-D inversion analysis of one of the shallow landslides near the epicenter using a Bing debris-flow model. At this site, the slope failure comprised cover soil with an initial down-slope length of similar to 80 m and a thickness of similar to 7 m on a slope with < 20 degrees dip. The landslide moved southeastward with a run-out distance of similar to 100 m. Inversion analysis of the post-failure deposit geometry was conducted with the Markov Chain Monte Carlo method (MCMC) to optimize the Bingham rheological parameters of the debris. The analysis reproduced several features of the deposit geometry with a yield stress of similar to 1500 Pa and dynamic viscosity of 800-3000 Pa s. The results suggest that the shallow landslide can be approximated by the flow of a viscoplastic fluid with high-mobility debris and a maximum frontal velocity of 6-9 m/s, with a flow duration of 2-4 min. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82200 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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