2012 Fiscal Year Final Research Report
Research on postseismic deformation and healing process at plate subduction zones
| Project/Area Number |
22540437
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Nagoya University |
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Principal Investigator |
SAGIYA Takeshi 名古屋大学, 減災連携研究センター, 教授 (50362299)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 余効変動 / 巨大地震 / 地震サイクル / 粘弾性緩和 |
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| Research Abstract |
In this project, problems related to crustal deformation associated with the 2011 Tohoku-oki earthquake were investigated. This giant earthquake was not foreseen before its occurrence. I found that one of the reasons of this failure was a scale error in the baseline survey conducted with the first triangulation in the Meiji era, which was caused by the 1894 Shonai earthquake. I also constructed a kinematic earthquake cycle model that can reproduce interseismic as well as coseismic subsidence, and long-term slight uplift along the Pacific coast of the Tohoku area. The long recurrence interval of earthquake in the shallow portion of the plate boundary is responsible for the vertical movement. Viscoelastic relaxation effects are indispensable.
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