Deep structure of the Median Tectonic Line revealed by an integrated seismic profiling across the Seto Inland Sea

濑户内海综合地震剖面揭示中位构造线的深层结构

• 批准号: 14204048
• 负责人: ITO Tanio
• 金额: $ 34.86万
• 依托单位: Chiba University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14204048/
• 关键词: Seto-Shikoku profile; Southwest Japan; Median Tectonic Line; seismic profiling; Philippine Sea Plate; lower crust; Aki fault; 瀬戸内海

Trans-Seto and Shikoku seismic reflection profiling was made as a joint expedition of ERI, JAMSTEC and our research group based on this grant, the end of August, 2002. The deep crustal structure was indicated in an integrated profile of single-fold profiles. Significant results are summarized as follows :1.The subducting Philippine Sea plate (PHS) is clearly recognized as a combination of reflective layers 1+2 and transparent layer 3.2.The lower crust of the Japanese island arc is gently dipping southward and comes into contact with the PHS beneath the middle Shikoku.3.The Median Tectonic Line (MTL) is dipping at about 30 degrees and merges into the lower crust beneath the Seto Inland Sea.4.Major boundary faults, the Butsuzo Tectonic Line (BTL) and the Aki fault (AF) in the accretionary complexes are dipping northward and merges into the lower crust beneath the Seto Inland Sea.

基于这笔资助，2002年8月底，ERI、JAMSTEC和我们的研究小组联合考察了跨濑户和四国地震反射剖面。在单折剖面的综合剖面中显示了深部地壳结构。重要结果总结如下：1.俯冲的菲律宾海板块（PHS）被清楚地识别为反射层1+2和透明层的组合3.2.日本岛弧的下地壳缓慢向南倾斜并接触与四国中部下方的PHS。3.中位构造线（MTL）倾斜约30度，并融入濑户内海下方的下地壳。4.主要边界断层、增生杂岩中的布津构造线 (BTL) 和安艺断层 (AF) 向北倾斜并融入濑户内海下方的下地壳。

项目成果

Miyauchi, T., Tanaka, T., Ito, T., others: "Active tectonics of the Kannawa-Kozu-Matsuda fault system developed as a thrust-front migration process, central Japan, analyzed by seismic reflection profiling"Deep Seismic Profiling of the Continents and their

Miyauchi, T.、Tanaka, T.、Ito, T.等人：“通过地震反射剖面分析，日本中部作为逆冲前移过程而发展起来的铁轮-神津-松田断层系的活动构造”深地震剖面

宮脇崇裕(分担): "日本の地形2 北海道"東京大学出版会. 359 (2003)

Takahiro Miyawaki（撰稿人）：《日本地形 2 北海道》东京大学出版社 359（2003 年）。

Ito, T: "Active faulting, lower crustal delamination and ongoing Hidaka arc-arc collision, Hokkaido, Japan."Seismotectonics in Convergent Plate Boundary (Y.Fujinawa et al., eds.). 219-224 (2002)

Ito, T：“活动断层、下地壳分层和正在进行的日高弧-弧碰撞，日本北海道。”汇聚板块边界中的地震构造（Y.Fujinawa 等人编辑）。

Tsurumi, J., Hosonuma, H., Kanagawa, K.: "Strain localization due to a positive feedback of deformation and myrmekite-forming reaction in granite and aplite mylonites along the Hatagawa Shear Zone of NE Japan."Journal of Structural Geology. 25. 557-584 (2

鹤见 J.、细沼 H.、神奈川 K.：“日本东北部波田剪切带花岗岩和细粒糜棱岩变形和磁石形成反应的正反馈导致应变局部化。”结构地质学杂志。

Tsurumi, J., Hosonuma, H., Kanagawa, K.: "Strain localization due to a positive feedback of deformation and myrmekite-forming reaction in granite and aplite mylonites along the Hatagawa Shear Zone of NE Japan"Journal of Structural Geology. 25. 557-584 (20

鹤见 J.、细沼 H.、神奈川 K.：“日本东北部畑川剪切带花岗岩和细粒糜棱岩变形和磁石形成反应的正反馈导致的应变局部化”《结构地质学杂志》。