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北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University >
第73号 >

十勝岳62-Ⅱ火口周辺の3次元比抵抗構造

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/gbhu.73.281

Title: 十勝岳62-Ⅱ火口周辺の3次元比抵抗構造
Other Titles: Three-dimensional resistivity structure around the 62-II crater at Tokachidake volcano
Authors: 山谷, 祐介1 Browse this author
橋本, 武志2 Browse this author
茂木, 透3 Browse this author
村上, 亮4 Browse this author
岡崎, 紀俊5 Browse this author
吉本, 充宏6 Browse this author
伏谷, 祐二7 Browse this author
橋本, 政樹8 Browse this author
山本, 輝明9 Browse this author
西村, 三治10 Browse this author
有田, 真11 Browse this author
的場, 敦史12 Browse this author
土屋, 遼平13 Browse this author
Authors(alt): YAMAYA, Yusuke1
HASHIMOTO, Takeshi2
MOGI, Toru3
MURAKAMI, Makoto4
OKAZAKI, Noritoshi5
YOSHIMOTO, Mitsuhiro6
FUSHIYA, Yuji7
HASHIMOTO, Masaki8
YAMAMOTO, Teruaki9
NISHIMURA, Mitsuharu10
ARITA, Makoto11
MATOBA, Atsushi12
TSUCHIYA, Ryohei13
Issue Date: 20-Dec-2010
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 73
Start Page: 281
End Page: 294
Abstract: Tokachidake Volcano is an active volcano, situated at the SW end of the Daisetsu-Tokachi volcanic chain in the central Hokkaido, Japan. We performed the AMT resistivity survey around the 62 -II crater at the volcano in order to realize the hydrothermal zone, focusing on the recent activity of the crustal inflation and demagnetization beneath the crater. The measured AMT data suggested the three-dimensional structure beneath the study area. Prior to the resistivity modeling, we estimated an effect due to a steep topography in the study area. This estimation clearly showed a strong effect to the apparent resistivity, impedance phase and induction vector. Therefore, the simplified topography was included to the three-dimensional model. The resistivity model supposed by a forward modeling was characterized by a conductor (0.5Ωm) beneath the 62-II crater. We investigated a physical condition which could bring the resistivity of 0.5Ωm, and then estimated that high porosity (0.3)rocks were saturated with hot(~200℃)pore water including dissolved components. Although the origin of hydrothermal water has been unresolved, this result suggests that a hydrothermal zone is developed beneath the 62-II crater.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/44482
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第73号

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