Distribution of shortening landward and oceanward of the eastern Nankai trough due to the Izu-Ogasawara ridge collision

Details Distribution of shortening landward and oceanward of the eastern Nankai trough due to the Izu-Ogasawara ridge collision Distribution of shortening landward and oceanward of the eastern Nankai trough due to the Izu-Ogasawara ridge collision

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996e%26psl.137..145l&link_type=abstract

Earth and Planetary Science Letters, vol. 137, Issue 1-4, pp.145-156

Physics

7

Scientific paper

The convergence of the Philippine Sea and Eurasia plates is accommodated primarily by plate subduction along the Nankai trough west of about 137.3°E, but additionally by widely distributed onshore and offshore deformation to the east. This zone, with a total dimension of 200 km (parallel to the Nankai trough) by 350 km, has developed as one highly coupled region since the collision of the Izu peninsula with mainland Japan about 1 - 2 m.y. ago. The onshore faulting in central Japan is consistent with a WNW-ESE direction of maximum horizontal stress, while the oceanward deformation is driven by diffuse NW-SE shortening of the Izu-Ogasawara volcanic ridge which produces a kinematic discontinuity with respect to the Philippine Sea oceanic crust to its west. The strain release associated with the 1891 Nobi earthquake, and the onshore deformation as a whole, suggests that the Philippine Sea-Eurasia convergence is partially accommodated by onshore shortening between the Tsuruga Bay-Ise Bay Tectonic Line and the Izu peninsula.

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