2013 Fiscal Year Final Research Report
Study on uplift and erosion history in the Outer Belt of Southwest Japan
| Project/Area Number |
23654172
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
MATSUSHI Yuki 京都大学, 防災研究所, 准教授 (90596438)
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| Co-Investigator(Renkei-kenkyūsha) |
HIRAISHI Narumi 深田地質研究所, 研究員 (40548319)
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| Project Period (FY) |
2011 – 2013
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| Keywords | テクトニクス / 地形 |
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| Research Abstract |
We found that paleosurfaces are widely distributed in higher elevations and that they are being incised by the Kumano River. The Nakahara River, a tributary of the Kumano River, has knickpoints propagating upstream and undercutting nearby slopes. Dip slopes in particular are destabilized by the undercutting and gravitationally deformed. Most of the tributaries of the Tennokawa River, the upstream portion of the Kumano River, have knickpoints, above which the tributaries are within paleosurfaces. The long river profiles of the tributaries above knickpoints were extended downstream to reconstruct long river profiles of the paleo Tennnokawa River. The reconstructed river bed was about 150 m above the river bed of the current Tennnokawa River. We found a gravel bed on the paleo river bed and dated it 30 ka by cosmogenic nuclide dating. The incision rate of 150 m in 30 ka is very high, suggesting a consistent uplift rate in this area.
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[Presentation] Extracting small scarps to predict potential sites of deep-seated landslides2013
Author(s)
Chigira, M., Tsou, C.-Y., Yokoyama, R., Shirasawa, M., Funakoshi, K., Sakurai, Y.
Organizer
Japan Geoscience Union Meeting 2013
Place of Presentation
Makuhari
Year and Date
2013-05-22
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