The eastern and western ends of Nankai Trough: results of Box 5 and Box 7 Kaiko survey

Details The eastern and western ends of Nankai Trough: results of Box 5 and Box 7 Kaiko survey The eastern and western ends of Nankai Trough: results of Box 5 and Box 7 Kaiko survey

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987e%26psl..83..199l&link_type=abstract

Earth and Planetary Science Letters, Volume 83, Issue 1-4, p. 199-213.

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Scientific paper

Seabeam mapping and detailed geophysical surveying have been conducted over the eastern and western ends of the Nankai Trough. The eastern survey covers the transition between the large Izu-Bonin (Izu-Ogasawara) Ridge collision with Honshu and the Nankai Trough subduction. It includes a northeast trending basement ridge, the Zenisu Ridge, to the southeast of Nankai Trough as well as two large channel systems, one following the trench, the Nankai channel and the other coming from the north, the Tenryu Canyon. The Zenisu Ridge is a zone of recent intra-plate shortening consisting of three distinct segments with an increasing deformation from southwest to northeast. We interpret this gradient of deformation as a way to absorb the kinematic discontinuity between the diffuse shortening prevailing over the Izu-Bonin Ridge and the concentrated shortening along the Nankai Trough. The shortening axis appears to change from north-south along the Zenisu Ridge to northwest-southeast along the Nankai Trough and finally to east-west within Honshu. The western survey covers the junction between the Nankai and Ryukyu Trenches and the Kyushu-Palau Ridge which is subducted without major internal deformation. The ridge appears to act as an indenter upon the margin. The tip of the indenter is presently situated under the upper accretionary prism.

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