Detailed Structure of the Nankai Trough from Migrated Seismic Sections: Convergent Margins: Field Investigations of Margin Structure and Stratigraphy
Detailed Structure of the Nankai Trough from Migrated Seismic Sections: Convergent Margins: Field Investigations of Margin Structure and Stratigraphy
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发表时间：
1982
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通讯作者：
Y. Aoki;T. Tamano;S. Kato
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作者：
Y. Aoki;T. Tamano;S. Kato
利用偏移地震记录研究南海海槽内槽坡的结构，以避免绕射效应。在南海海槽西部，地震偏移剖面显示，内坡脚逆冲断层使海沟充填浊积岩发生系统变形，形成平行于海沟的线性脊。另一方面，四国盆地的下伏沉积物是俯冲的，没有变形。南海海槽东部俯冲角比西部俯冲角陡。另外，浊积岩成因的增生沉积物主要通过褶皱变形，大型逆冲断层位于增生沉积物的下部。在东海粗隆中不存在明显的未变形层。
The structure of the inner trench slope of the Nankai trough is studied using migrated seismic records to avoid diffraction effects. In the western Nankai trough, the migrated seismic sections show systematic deformation of trench fill turbidites by thrust faults at the foot of the inner slope, forming linear ridges parallel with the trench. The underlying sediments of the Shikoku basin, on the other hand, are subducted and not deformed. The angle of subduction is steeper in the eastern Nankai trough than in the western part. Alternatively, accreted sediment of turbidite origin is subjected to deformation mostly by folding and large thrust faults are localized in the lower section of accreted sediments. No appreciable undeformed layer exists in the eastern Nankai rough.