2015 Fiscal Year Final Research Report
Precise estimation of long-term vertical crustal movement along the Sanriku Coast, based on geomorphological and geological information
| Project/Area Number |
26882001
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Single-year Grants |
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| Research Field |
Geography
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2014-08-29 – 2016-03-31
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| Keywords | 三陸海岸 / 海成段丘 / 東北地方太平洋沖地震 / 火山灰 / 地殻変動 |
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| Outline of Final Research Achievements |
Geomorphological and geological surveys were conducted at Pleistocene terrace and Holocene lowland along the Sanriku Coast in order to reveal long-term vertical crustal movement.
As for marine terrace, I identified last-interglacial marine terraces in the northern part of Sanriku Coast and they show slow uplift rate (0.1-0.2 mm/yr). However, last-interglacial marine terraces were not identified in the middle to southern part of the Sanriku Coast. Then, I conducted drilling survey at Holocene lowland in the middle-southern part of the Sanriku Coast and recognized terrestrial deposits below the present sea level. This indicates subsidence during Holocene. In this study, I revealed that the long-term vertical crustal movement is various along the Sanriku Coast. These data are important to discuss subduction and earthquake cycle along the Japan Trench.
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| Free Research Field |
変動地形学
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