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タイトル
  • en Magmatic–hydrothermal system of Aso Volcano, Japan, inferred from electrical resistivity structures
作成者
    • en Matsushima, Nobuo
    • en Utsugi, Mitsuru
    • en Takakura, Shinichi
    • en Yamasaki, Tadashi
    • en Hata, Maki
    • en Uyeshima, Makoto
アクセス権 open access
権利情報
主題
  • Other en Broadband magnetotelluric
  • Other en Electrical resistivity structure
  • Other en Magmatic–hydrothermal system
  • Other en Brine, Aso volcano
  • NDC 453
内容注記
  • Abstract en We investigated the magmatic–hydrothermal system of Aso Volcano, Japan, using broadband magnetotelluric (MT) data. To establish the nature of the shallow crust, a previous resistivity model based on data from 100 measurement sites in and around Aso volcano was revised using data from 9 additional sites near Naka-dake crater, which is located in the central part of the volcano. The components of MT impedance and the tipper vector were used to obtain the resistivity structure by three-dimensional inversion. The resistivity structure shows a subvertical low-resistivity (< 1 Ωm) column-shaped body beneath Naka-dake crater that extends from − 600 m to 10 km below sea level (BSL) and dips steeply to the north-northeast. The position of the upper part of the column is displaced eastward compared with the previous model and does not overlap the position of the presumed magma reservoir inferred previously from seismic and geodetic observations underneath the western side of Naka-dake crater at a depth of 5 km. We interpret this low-resistivity column to be a magmatic–hydrothermal system composed of brine and magma that were transported to Naka-dake crater from the main deep-seated magma reservoir. A horizontal low-resistivity (< 10 Ωm) layer occurs beneath post-caldera cones at the depths of 0–2 km BSL, and this layer extends laterally from the upper part of the low-resistivity column. We interpret this low-resistivity layer as representing a shallow hydrothermal system that has developed around the central column-shaped magmatic–hydrothermal system.
出版者 en Springer
日付
    Issued2020
言語
  • eng
資源タイプ journal article
出版タイプ VoR
資源識別子 HDL http://hdl.handle.net/2115/78361
関連
  • isIdenticalTo DOI https://doi.org/10.1186/s40623-020-01180-8
収録誌情報
    • PISSN 1343-8832
    • EISSN 1880-5981
    • NCID AA11211921
      • en Earth, Planets and Space
      • 巻72 号1 開始ページ57
ファイル
コンテンツ更新日時 2023-07-26