2015 Fiscal Year Final Research Report
Development of the new method for tephra identification using the paleomagnetic directions
| Project/Area Number |
26870073
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geology
Solid earth and planetary physics
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| Research Institution | Ibaraki University |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
MOCHIZUKI NOBUTATSU 熊本大学, 理学部, 准教授 (60422549)
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 広域テフラ / 古地磁気方位 / 大規模噴火 |
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| Outline of Final Research Achievements |
The purpose of this study is to evaluate and develop the new method for tephra identification on the paleomagnetic directions. We developed a sampling procedure for accurate oriented samples of tephra layers. We made a guide for a plastic cube, which can be fixed on the surface of a tephra outcrop. This procedure makes it possible to obtain a mean remanent magnetization of sevaral tephra layers with a 95% confidence limit of about 2 to 3°, and we confirmed the method is useful for tephra identification. In addition, we proposed another new method for timescale estimation by quantifying paleomagnetic directions of successive tephra layers and comparing with a secular variation.
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| Free Research Field |
火山学
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