紀伊半島南部地域の重力異常と深部比抵抗構造から推定される地熱構造

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書誌事項

タイトル別名
  • Geothermal Structure of the Southern Part of the Kii Peninsula Estimated from the Gravity Anomaly and the Deep Resistivity Structure
  • キイハントウ ナンブ チイキ ノ ジュウリョク イジョウ ト シンブヒ テイコウ コウゾウ カラ スイテイ サレル チネツ コウゾウ

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抄録

Gravity interpretation and magnetotelluric (MT) survey were carried out in the southern part of the Kii peninsula, where many anomalous high temperature hot springs are distributed, in order to estimate the geothermal structure in the crust at depths up to nearly 30km. The results and their prospects of this survey are as follows: (1) A high-density and resistive body exists in the central region of the survey area. It extends from the southernmost part of the survey area toward the north. This body may geologically coincide with the pluton of Omine acidic rocks; (2) An extremely conductive layer is located at the depth of 5 to 15km in the western region of the survey area. It implies a reservoir of hypersaline water; (3) The lower crust appears as conductive layer. This feature implies that the conductive lower crust is saturated with water brought by the subducting Philippine Sea plate; (4) Hot springs around the Hongu town are located along the extension of the crustal boundary between the high-density and resistive body and the conductive layer. This fact suggests that the fluid migrated from the lower crust through the fractured zone between the Shimanto super group and Tertiary acidic rocks cause high temperature and high 3He emanation associated with springs in this region.

収録刊行物

  • 地震　第２輯

    地震　第２輯 57 (3), 245-255, 2005

    公益社団法人 日本地震学会

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