2011 Fiscal Year Final Research Report
Imaging magma plumbing system using InSAR analyses with corner reflectors
| Project/Area Number |
21540432
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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 | The University of Tokyo |
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Principal Investigator |
OIKAWA Jun 東京大学, 地震研究所, 助教 (40262084)
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| Co-Investigator(Kenkyū-buntansha) |
FURUYA Masato 北海道大学, 大学院・理学研究院, 教授 (60313045)
IGUCHI Masato 京都大学, 防災研究所, 教授 (60144391)
AOKI Yosuke 東京大学, 地震研究所, 助教 (90376624)
WATADA Shingo 東京大学, 地震研究所, 助教 (30301112)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 火山現象 / 火山噴火 / InSAR / 人工永久散乱体 / 地殻変動 / マグマ上昇過程 |
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| Research Abstract |
Suwanose-jima is one of the most active volcano of Japan with quasi-continuous unrest since 1957. It is monitored with broadband seismometers and tiltmeters but the difficulty in ground access to the island prohibits us to construct large-enough network to understand the magma plumbing system solely from the ground-based monitoring network. Ground deformation observed by the InSAR analysis thus has a potential to gain moreinsights into our understanding of the magma plumbing system of this volcano.We analyzed 43 images (19 ascending and 24 descending images, respectively) taken between March, 2007, and February, 2011. Despite strong explosive eruption activity in2007-2011, no deformation was detected for interferograms from all possible pairs except for small (several centimeters of line-of-sight changes) deformaiton in an interferogram between August 17, 2007, and January 2, 2008, which could represent deformation due to explosive eruptions in December, 2007. Explosive eruptions without significant deformation can be interpreted as eruptions without feeding magma from depth or magma propagation through the conduit without deformation.
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