中部マリアナトラフ拡大軸における火山活動位置についての考察 : 深海曳航式サイドスキャンソーナーと「しんかい6500」による高解像度観察の記録から  [in Japanese] Implications of Volcanic Activity in the Central Mariana Trough Median Valley, Based on the Deep-Towed Side-scan Sonar Imagery and Manned Submersible Observations  [in Japanese]

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Author(s)

    • 浅田 美穂 ASADA Miho
    • 独立行政法人海洋研究開発機構地球内部ダイナミクス領域海洋プレート活動研究プログラム Institute for Research on Earth Evolution, Plate Dynamics Research Program, Japan Agency for Marine-Earth Science and Technology
    • 富士原 敏也 FUJIWARA Toshiya
    • 独立行政法人海洋研究開発機構地球内部ダイナミクス領域海洋プレート活動研究プログラム Institute for Research on Earth Evolution, Plate Dynamics Research Program, Japan Agency for Marine-Earth Science and Technology
    • 海野 進 UMINO Susumu
    • 金沢大学理工研究域自然システム学系 Earth Science Course Division of Earth and Environmental Sciences, Kanazawa University

Abstract

We collected high-resolution sidescan sonar imagery over the central part of active back-arc spreading basin, Mariana Trough, at 17° North ("Seg-17"). Spreading center is situated in the eastern side of the Mariana Trough, which divides the trough into approximately 3:2 in the west and east of the axis. Multi-scale observations, which are shipboard multi-beam bathymetric survey using R/V Yokosuka, the deep-towed side-scan sonar survey using Wadatsumi, and visual observation using submersible Shinkai6500, show that two predominant trends in geological features (fault, fissure, and volcanic ridge) are developed on the axial valley floor in either scale of observations. These two trends of linear features are almost parallel to each trend of "V-shaped ridge" developed along centerline of the axial valley floor. One trend is N15° W subparallel to the trend of the axial valley itself. Another trend is almost NS. There are no obvious differences in age between these two trending features. Volcanic activity is dominant in the western-half of the axial valley floor, which is indicated by the backscatter intensity pattern and by visual observations.

Journal

  • BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN

    BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN 57(1), 1-18, 2012

    The Volcanological Society of Japan

References:  51

Codes

  • NII Article ID (NAID)
    110009426526
  • NII NACSIS-CAT ID (NCID)
    AN10512786
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    0453-4360
  • NDL Article ID
    023617538
  • NDL Call No.
    Z15-101
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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