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タイトル: Ground uplift related to permeability enhancement following the 2011 Tohoku earthquake in the Kanto Plain, Japan
著者: Ishitsuka, Kazuya
Matsuoka, Toshifumi
Nishimura, Takuya
Tsuji, Takeshi
ElGharbawi, Tamer
著者名の別形: 松岡, 俊文
西村, 卓也
キーワード: Post-seismic displacement
2011 Tohoku earthquake
Synthetic aperture radar interferometry
Permeability enhancement
Tokyo
発行日: 19-Jun-2017
出版者: Springer Nature
誌名: Earth, Planets and Space
巻: 69
論文番号: 81
抄録: We investigated the post-seismic surface displacement of the 2011 Tohoku earthquake around the Kanto Plain (including the capital area of Japan), which is located approximately 400 km from the epicenter, using a global positioning system network during 2005–2015 and persistent scatterer interferometry of TerraSAR-X data from March 2011 to November 2012. Uniform uplift owing to viscoelastic relaxation and afterslip on the plain has been reported previously. In addition to the general trend, we identified areas where the surface displacement velocity was faster than the surrounding areas, as much as ~7 mm/year for 3 years after the earthquake and with a velocity decay over time. Local uplift areas were ~30 × 50 km2 and showed a complex spatial distribution with an irregular shape. Based on an observed groundwater level increase, we deduce that the local ground uplift was induced by a permeability enhancement and a pore pressure increase in the aquifer system, which is attributable to mainshock vibration.
著作権等: © The Author(s) 2017. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
URI: http://hdl.handle.net/2433/227927
DOI(出版社版): 10.1186/s40623-017-0666-7
出現コレクション:学術雑誌掲載論文等

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