During the GS22 cruise of the R/V Shinyo Maru (The Tokyo University of Marine Science and Technology) from May to June 2022, a high-resolution subbottom profiler (SBP) survey was conducted, focusing on the area of the Tokara Islands and Yakushima Island to obtain geological information on the shallow subbottom structure in the area. This paper summarizes the shallow subbottom structure around Yakushima and Takarajima Islands, as revealed by the SBP surveys. Although the internal structure of the sedimentary sequences could not be determined over most of the continental shelf in the area north of Yakushima Island, we identified partially stratified sedimentary sequences with a maximum thickness of ~20 m below the seafloor. The SBP profiles revealed the internal structure of stratified sedimentary sequences down to a maximum of 40 m below the seafloor in the volcanic front area located west of Yakushima Island. The partially stratified sedimentary sequences occur between the volcanic front area and the western slope of the Tane-Yaku Spur, a characteristic bathymetric high between Yakushima and Tanegashima Islands, although most of the internal structure could not be identified due to poor penetration of acoustic waves. We also surveyed the area north of Takarajima Island, where many earthquakes have occurred in recent years, suggesting the presence of seafloor movement related to seismic activity. However, the data indicate that no faults or intrusion structures have reached the seafloor or shallow part of the sedimentary sequences in this region.
"},{"@language":"ja","@value":"GS22航海では，2022年5月から6月の期間に東京海洋大学の神鷹丸を用いて，トカラ列島周辺海域で高分解能サブボトムプロファイラー探査を行い，本海域の海底下浅部に関する地質情報を取得した．本論では，屋久島周辺海域及び宝島北方海域でのSBP探査により明らかになった海底下浅部の地質構造をまとめる．屋久島の周辺部のうち，屋久島北方沖では陸棚部分の堆積層の内部構造は不明であったが，部分的に成層した層厚が海底面下最大20 m程度の堆積層が認められた．屋久島西方沖の火山フロント域では海底面下最大約40 mまで成層した堆積層の内部構造を把握できた．屋久島南方沖の火山フロント域及び種子–屋久海脚の部分では，部分的に成層した堆積層が認められるが，音波の透過が悪く内部構造の大部分は不鮮明であった．また，近年地震が群発している宝島北方沖の観測では地震活動に関連した海底変動の存在を想定したが，海底に到達した断層及び下部からの貫入構造などは認められなかった．
"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1410584342829138564","@type":"Researcher","foaf:name":[{"@language":"en","@value":"MISAWA Ayanori"},{"@language":"ja","@value":"三澤 文慶"}],"jpcoar:affiliationName":[{"@language":"en","@value":"AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation"},{"@language":"ja","@value":"産業技術総合研究所 地質調査総合センター地質情報研究部門"}]},{"@id":"https://cir.nii.ac.jp/crid/1410584342829138565","@type":"Researcher","foaf:name":[{"@language":"en","@value":"FURUYAMA Seishiro"},{"@language":"ja","@value":"古山 精史朗"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"国立大学法人東京海洋大学海洋資源環境学部"},{"@language":"en","@value":"Tokyo University of Marine Science and Technology, School of Marine Resources and Environment"}]},{"@id":"https://cir.nii.ac.jp/crid/1410584342829138563","@type":"Researcher","foaf:name":[{"@language":"en","@value":"KOGE Hiroaki"},{"@language":"ja","@value":"高下 裕章"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"産業技術総合研究所 地質調査総合センター地質情報研究部門"},{"@language":"en","@value":"AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation"}]},{"@id":"https://cir.nii.ac.jp/crid/1410584342829138560","@type":"Researcher","foaf:name":[{"@language":"en","@value":"ARIMOTO Jun"},{"@language":"ja","@value":"有元 純"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"産業技術総合研究所 地質調査総合センター地質情報研究部門"},{"@language":"en","@value":"AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation"}]},{"@id":"https://cir.nii.ac.jp/crid/1410584342829138561","@type":"Researcher","foaf:name":[{"@language":"en","@value":"ISHINO Saki"},{"@language":"ja","@value":"石野 沙季"}],"jpcoar:affiliationName":[{"@language":"en","@value":"AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation"},{"@language":"ja","@value":"産業技術総合研究所 地質調査総合センター地質情報研究部門"}]},{"@id":"https://cir.nii.ac.jp/crid/1410584342829138562","@type":"Researcher","foaf:name":[{"@language":"en","@value":"SUZUKI Yoshiaki"},{"@language":"ja","@value":"鈴木 克明"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"産業技術総合研究所 地質調査総合センター地質情報研究部門"},{"@language":"en","@value":"AIST, Geological Survey of Japan, Research Institute of Geology and Geoinformation"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"13464272"},{"@type":"LISSN","@value":"13464272"},{"@type":"EISSN","@value":"2186490X"}],"prism:publicationName":[{"@language":"en","@value":"BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN"},{"@value":"地質調査研究報告"},{"@language":"en","@value":"Bull. 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