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Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
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
| 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: | 19-Mar-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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