2006 Fiscal Year Final Research Report Summary
Monitoring of the volcanic fluid system and elucidation of the deep-magma ascent mechanism at Aso volcano
| Project/Area Number |
15204040
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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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 |
KAWAKATSU Hitoshi The University of Tokyo, Earthquake Research Institute, Professor (60242153)
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| Co-Investigator(Kenkyū-buntansha) |
SUDO Yasuaki Kyoto University, Graduate School of Science, Associate Professor (40025466)
OKURA Takahiro Kyoto University, Graduate School of Science, Associate Professor (40233077)
KANESHIMA Satoshi Kyushu University, Graduate School of Sciences, Professor (80202018)
YAMAMOTO Mare Tohoku University, Graduate School of Science, Associate Professor (30400229)
HASHIMOTO Takeshi Hokkaido University, Graduate School of Science, Associate Professor (70283588)
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| Project Period (FY) |
2003 – 2006
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| Keywords | Aso volcano / broadband seismometer / volcanic tremor / lone-period tremor / volcanic eruption / magma ascent / GPS / array seismometry |
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| Research Abstract |
In order to monitor the volcanic fluid system and to elucidate the mechanism of magma ascent before eruptions, we deployed broadband seismometer and GPS networks in Aso volcano. We also conducted a series of dense array observations to monitor shallow fluid flow activities. As the result, (l) we were successful to observe extremely fast fluid movements in the shallow part of the volcano that appear to indicate a well developed shallow conduit system, (2) we have presented a model that explains the activities of long-period (15s) and short-period (1s) tremors as a result of the activities of a single conduit system of hydrothermal fluid flows. We have also developed an efficient method to compute the dynamic response of a fluid-filled crack that is flexible to many applications which may be encountered in volcano seismology.
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