Shallow submarine structure around Tokara Islands based on the high-resolution subbottom profiler survey during the GK20 cruise

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  • MISAWA Ayanori
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation
  • SUZUKI Yoshiaki
    AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation

Bibliographic Information

Other Title
  • GK20 航海での高分解能サブボトムプロファイラー探査に基づく トカラ列島周辺海域の海底下浅部構造

Abstract

<p>The GK20 cruise was conducted using the research vessel Kaiyo-Maru No.2 (Kaiyo Engineering Co., Ltd.) around the Tokara Islands area from early November to early December in 2020. In this cruise, a high-resolution subbottom profiler (SBP) survey was conducted to clarify the shallow submarine structure in the Okinawa Trough, the Volcanic front area, and the Ryukyu Arc area around the Tokara Islands. This paper reports on the shallow geological structures around the Tokara Islands as revealed by SBP profiles. In the Okinawa Trough area, the structure of well-stratified trough-fill sediments of the Okinawa Trough and the development of normal faults were confirmed. The bathymetric features of the volcanic front area can be roughly divided into islands or topographic high and flat plains. The internal structure of the islands and the topographic high was unclear, but there was a well-stratified sedimentary layer on the flat plain. On the flat surface located on the south side of the Takarajima Island, the development of the Yokoate Echelon Knoll Chains, six slanting lines organized by submarine volcanoes, was identified. In the Ryukyu Arc area, sand wave-like faces were recognized on the northern rim of the Oshima-Shin Sone. In the Amami Trough, the well-stratified sedimentary beds and the graben bounded by the normal fault were identified.</p>

Journal

  • BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 73 (5-6), 235-248, 2022-12-27

    National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan

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