Numerical modeling of subduction zone hydrothermal circulation: Toward understanding temperature-pressure condition of the seismogenic zone

• Project/Area Number: 25800246
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Solid earth and planetary physics
• Research Institution: Tohoku University (2015); Japan Agency for Marine-Earth Science and Technology (2014); The University of Tokyo (2013)
• Principal Investigator: Kawada Yoshifumi 東北大学, 災害科学国際研究所, 助教 (50402558)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2013: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
• Keywords: 熱水循環 / 沈み込み帯 / 日本海溝 / 南海トラフ / 数値シミュレーション / 温度構造 / 日本海港 / 熱流量 / 地殻熱流量

Outline of Final Research Achievements

Seismic activity of the subduction zone is affected by the temperature structure of the subducted oceanic plate. On the seaward of the Japan Trench and the Nankai Trough, heat flow values higher than expected from the plate age have been observed. This research project aims to elucidate relationships between the heat flow and the temperature structure. Anomalous heat flow around the Japan Trench is able to explain fluid circulation in an aquifer that thickens toward the trench axis. Gradual decrease in the heat flow from the Muroto to the Kumano districts can be explained by fluid flow below the trough floor along the strike of the subduction zone.

Research Products

• [Journal Article] Multiple-scale hydrothermal circulation in 135 Ma oceanic crust of the Japan Trench outer rise: Numerical models constrained with heat flow observations (2015)
  • Author(s): Labani Ray, Yoshifumi Kawada, Makoto Yamano, Hideki Hamamoto
  • Journal Title: Geochemistry, Geophysics, Geosystems Volume: 16 Issue: 8 Pages: 2711-2724
  • DOI: 10.1002/2015gc005771
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Heat flow anomaly on the seaward side of the Japan Trench associated with deformation of the incoming Pacific plate (2014)
  • Author(s): Makoto Yamano; Hideki Hamamoto; Yoshifumi Kawada; Shusaku Goto
  • Journal Title: Earth and Planetary Science Letters Volume: 407 Pages: 196-204
  • DOI: 10.1016/j.epsl.2014.09.039
  • Peer Reviewed
• [Journal Article] Hydrothermal heat mining in an incoming oceanic plate due to aquifer thickening: Explaining the high heat flow anomaly observed around the Japan Trench (2014)
  • Author(s): Kawada Y, Yamano M, Seama N
  • Journal Title: Geochem Geophys Geosyst Volume: 15 Issue: 4 Pages: 1580-1599
  • DOI: 10.1002/2014gc005285
  • Peer Reviewed
• [Presentation] 南海トラフ室戸沖から熊野沖にかけて観測された熱流量変化のモデル化 (2016)
  • Author(s): 川田佳史, 山野誠
  • Organizer: 日本地球惑星科学連合2016年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2016-05-23
• [Presentation] 日本海溝海側における海洋地殻の破砕と間隙流体循環―熱流量測定と電磁気探査による温度構造と流体分布の研究― (2016)
  • Author(s): 山野誠, 川田佳史, 笠谷貴史, 後藤忠徳, 市原寛
  • Organizer: ブルーアース2016
  • Place of Presentation: 東京都品川区
  • Year and Date: 2016-03-09
• [Presentation] Hydrothermal Heat Transport within an Abruptly Formed Permeable Slot: An Application to Heat Flow Peaks Observed at the Japan Trench Offshore of Sanriku (2015)
  • Author(s): Yoshifumi Kawada, Makoto Yamano
  • Organizer: 2015 American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisso, USA
  • Year and Date: 2015-12-15
  • Int'l Joint Research
• [Presentation] 日本海溝海側における熱流量異常：海洋地殻の破砕と間隙流体循環 (2015)
  • Author(s): 山野 誠, 川田 佳史, 濱元 栄起
  • Organizer: 日本地震学会2015年度秋季大会
  • Place of Presentation: 神戸市
  • Year and Date: 2015-10-28
• [Presentation] Multiple-scale heat flow anomalies seaward of the Japan Trench associated with deformation of the incoming Pacific plate (2015)
  • Author(s): Makoto Yamano, Yoshifumi Kawada, Labani Ray, Hideki Hamamoto
  • Organizer: IUGG 2015 General Assembly
  • Place of Presentation: Prague, Czech Republic
  • Year and Date: 2015-06-30
  • Int'l Joint Research
• [Presentation] 日本海溝アウターライズにおける熱流量の高密度測定：海洋地殻の破砕と間隙流体循環 (2015)
  • Author(s): 山野誠、川田佳史、濱元栄起
  • Organizer: 日本地球惑星科学連合２０１５年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2015-05-28
• [Presentation] 部分的に厚くなる透水層内の水循環：日本海溝アウターライズのkmスケールの熱流量異常を説明するモデル (2015)
  • Author(s): 川田佳史、山野誠
  • Organizer: 日本地球惑星科学連合２０１５年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2015-05-28
• [Presentation] Hydrothermal Heat Mining Due to the Aquifer Thickening Toward the Trench Axis: A Model for Explaining High Heat-flow Anomalies on the Seaward Side of the Japan Trench (2014)
  • Author(s): Yoshifumi Kawada; Makoto Yamano; Nobukazu Seama
  • Organizer: Asia Oceania Geoscience Society 11th Annual Meeting
  • Place of Presentation: Royton Sapporo Hotel（北海道札幌市）
  • Year and Date: 2014-08-01
• [Presentation] 東北日本の熱流量異常を説明する熱モデル：海溝軸に向かって厚くなる透水層内で起こる熱水循環による熱の汲み上げ (2014)
  • Author(s): 川田佳史、山野誠、島伸和
  • Organizer: 日本地球惑星科学連合２０１４年大会
  • Place of Presentation: 幕張メッセ（千葉県千葉市）
  • Year and Date: 2014-05-02
• [Presentation] Thermal subduction-zone model including hydrothermal circulation in an aquifer that thickened toward the trench axis (2013)
  • Author(s): Y. Kawada, M. Yamano, N. Seama
  • Organizer: Japan Geoscience Union Meeting 2013
  • Place of Presentation: 幕張メッセ
• [Presentation] High heat flow anomaly seaward of the Japan Trench associated with deformation of the subducting Pacific plate (2013)
  • Author(s): M. Yamano, Y. Kawada, H. Hamamoto, and S. Goto
  • Organizer: Japan Geoscience Union Meeting 2013
  • Place of Presentation: 幕張メッセ