2013 Fiscal Year Final Research Report
Research of rheological structure beneath the Ou-backbone Range based on the multiple geodetic data
| Project/Area Number |
22740287
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Tohoku University |
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Principal Investigator |
OHTA Yusaku 東北大学, 理学(系)研究科(研究院), 助教 (50451513)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | レオロジー構造 / GPS / 水準測量 / 合成開口レーダ / 2011年東北地方太平洋沖地震 |
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| Research Abstract |
We investigated the postseismic crustal deformation following the 2008 Iwate-Miyagi inland earthquake based on the precise leveling, dense GPS observation, and InSAR data. We investigated the rheological structure in the northeastern Japan arc based on the dense GPS network of far field from the focal region. In contrast, the near field of the focal region of the 2008 event, it is difficult to explain the some of the short-wave length crustal deformation. These anomalies will reflect the long-term aseismic slip in the shallower portion around the coseismic fault. Furthermore, we evaluated an anomalous crustal strain distribution in the Tohoku region associate with a step-like stress change induced by the 2011 Tohoku earthquake (Mw9.0). These strain anomalies may reflect the inhomogeneity of the rheology or stiffness of the crust.
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[Journal Article] Geodetic constraints on afterslip characteristics following the March 9, 2011, Sanriku-oki earthquake, Japan2012
Author(s)
Ohta, Y., R. Hino, D. Inazu, M. Ohzono, Y. Ito, M. Mishina, T. Iinuma, J. Nakajima, Y. Osada, K. Suzuki, H. Fujimoto, K. Tachibana, T. Demachi, and S. Miura
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Journal Title
Geophys. Res. Lett
Volume: 39
Pages: L16304
DOI
Peer Reviewed
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[Journal Article] Large intraslab earthquake (2011 April 7 M7.1) after the 2011 off the Pacific coast of Tohoku earthquake (M9.0) : Coseismic fault model based on the dense GPS network data2011
Author(s)
Ohta, Y., S. Miura, M. Ohzono, S. Kita, T. Iinuma, T. Demachi, K. Tachibana, T. Nakayama, S. Hirahara, S. Suzuki, T. Sato, N. Uchida, A. Hasegawa, and N. Umino
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Journal Title
Earth Planets and Space
Volume: 63(12)
Pages: 1207-1211
DOI
Peer Reviewed
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[Presentation] 水準測量による2008年岩手, 宮城内陸地震後の上下地殻変動場(序報)2010
Author(s)
太田雄策, 大園真子, 赤塚正樹, 小林竜也, 出町知嗣, 三浦哲, 立花憲司, 鈴木秀市, 小澤和浩, 鷺谷威, 山本淳平, 若杉貴浩, 村瀬雅之, 西村卓也, 小林知勝
Organizer
日本測地学会第114回講演会
Place of Presentation
宇治市, 京都大学宇治キャンパス
Year and Date
2010-11-09
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