2011 Fiscal Year Final Research Report
Mechanism of dike growth within a mechanically-heterogeneous host rock
| Project/Area Number |
21710182
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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 |
Natural disaster science
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| Research Institution | National Institute of Advanced Industrial Science and Technology |
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Principal Investigator |
GESHI Nobuo 独立行政法人産業技術総合研究所, 地質情報研究部門, 主任研究員 (70356955)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 火山 / 噴火 / マグマ / 噴火推移予測 |
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| Research Abstract |
The shapes of dikes intruding the layered host rock of Miyakejima and Reunion Island are examined by the field observations. Structural difference between feeder and non-feeder dikes are revealed. Numerical FEM simulations indicate that the variation of dike thickness observed in Miyakejima and Piton de la Fournaise can be broadly explained in terms of layer-stiffness differences of one or two orders of magnitude. Based on the results, the effects of the dike propagation process controlled by the host rock structure on the location and process of fissure eruptions are evaluated.
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