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タイトル: | Estimation of dynamic friction of the Akatani landslide from seismic waveform inversion and numerical simulation |
著者: | Yamada, Masumi Mangeney, Anne Matsushi, Yuki Moretti, Laurent |
著者名の別形: | 山田, 真澄 松四, 雄騎 |
キーワード: | Geomorphology Friction Wave propagation |
発行日: | 1-Sep-2016 |
出版者: | Oxford University Press (OUP) |
誌名: | Geophysical Journal International |
巻: | 206 |
号: | 3 |
開始ページ: | 1479 |
終了ページ: | 1486 |
抄録: | We performed numerical simulations of the 2011 deep-seated Akatani landslide in central Japan to understand the dynamic evolution of friction of the landslide. By comparing the forces obtained from numerical simulation to those resolved from seismic waveform inversion, the coefficient of the friction during sliding was investigated in the range of 0.1-0.4. The simulation assuming standard Coulomb friction shows that the forces obtained by the seismic waveform inversion are well explained using a constant friction of mu = 0.3. A small difference between the residuals of Coulomb simulation and a velocity-dependent simulation suggests that the coefficient of friction over the volume is well constrained as 0.3 most of time during sliding. It suggests the sudden loss of shearing resistance at the onset of sliding, that is, sudden drop of the initial coefficient of friction in our model, which accelerates the deep-seated landslide. Our numerical simulation calibrated by seismic data provides the evolution of dynamic friction with a reasonable resolution in time, which is difficult to obtain from a conventional runout simulation, or seismic waveform inversion alone. |
著作権等: | This article has been accepted for publication in 'Geophysical Journal International' © The Authors 2016. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
URI: | http://hdl.handle.net/2433/252334 |
DOI(出版社版): | 10.1093/gji/ggw216 |
出現コレクション: | 学術雑誌掲載論文等 |
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