Extension in the southern Ryukyu arc (Japan): Link with oblique subduction and back arc rifting

Article Abstract:

Fracture analysis was undertaken on the four main islands of the southern Ryukyu arc, at the island scale and by interpretation of air photographs of Miyako and Yonaguni, with the aim of checking the relative significance of extensional tectonics. A pre-Miocene intermediate-type stress field was recorded in Eocene rocks of Ishigaki Island, although Neogene to Quaternary strata recorded just tensional stress fields. No onshore structure was recognized that may suggest strike-slip or reverse-slip deformation in the Neogene or Quaternary strata.

Subduction zones (Geology), Subduction zones

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Cenozoic intracontinental dextral motion in the Okhotsk-Japan sea region

Article Abstract:

A northward-trending, 2000-km right-lateral shear zone extends from central Japan to northern Sakhalin. Characterized by a major discontinuity and en echelon sigmoidal thrusts, folds and Miocene basins, the zone has accommodated hundreds of kilometers of displacement and had been active mainly in the Neogene. In the north, the zone has a transpressional style which changes to transtensional in its southern area. The dextral pull-apart opening of the Japan Sea was caused by this zone's strike-slip movement.

Faults (Geology), Sea of Japan

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Response of intracontinental deformation in the central Andes to late Cenozoic reorganization of South American Plate motions

Article Abstract:

A detailed view of late Cenozoic kinematic reorganization in the southern central Andes is provided.

Andes

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