| タイトル |
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en
Permeability-control on volcanic hydrothermal system : case study for Mt. Tokachidake, Japan, based on numerical simulation and field observation
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| 作成者 |
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| アクセス権 |
open access |
| 権利情報 |
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| 主題 |
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Other
en
Hydrothermal system
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Other
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Numerical simulation
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Other
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Magnetic total field
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Other
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Thermal activity
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Other
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Conduit obstruction
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Other
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Hydrothermal sealing
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NDC
450
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| 内容注記 |
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Abstract
en
We investigate a volcanic hydrothermal system by using numerical simulation with three key observables as reference: the magnetic total field, vent temperature, and heat flux. We model the shallow hydrothermal system of Mt. Tokachidake, central Hokkaido, Japan, as a case study. At this volcano, continuous demagnetization has been observed since at least 2008, suggesting heat accumulation beneath the active crater area. The surficial thermal manifestation has been waning since 2000. We perform numerical simulations of heat and mass flow within a modeled edifice at various conditions and calculate associated magnetic total field changes due to the thermomagnetic effect. We focus on the system’s response for up to a decade after permeability is reduced at a certain depth in the modeled conduit. Our numerical simulations reveal that (1) conduit obstruction (i.e., permeability reduction in the conduit) tends to bring about a decrease in vent temperature and heat flux, as well as heat accumulation below the level of the obstruction, (2) the recorded changes cannot be consistently explained by changing heat supply from depth, and (3) caprock structure plays a key role in controlling the location of heating and pressurization. Although conduit obstruction may be caused by either physical or chemical processes in general, the latter seems more likely in the case of Mt. Tokachidake.
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| 日付 |
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| 言語 |
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| 資源タイプ |
journal article |
| 出版タイプ |
VoR |
| 資源識別子 |
HDL
http://hdl.handle.net/2115/67560
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| 関連 |
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isIdenticalTo
DOI
https://doi.org/10.1186/s40623-017-0623-5
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| 収録誌情報 |
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en
Earth, Planets and Space
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巻69
号1
開始ページ39
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| ファイル |
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| コンテンツ更新日時 |
2023-07-26 |
