Modeling the Geometry of Plate Boundary and Seismic Structure in the Southern Ryukyu Trench Subduction Zone, Japan, Using Amphibious Seismic Observations

2018 ◽  
Vol 123 (2) ◽  
pp. 1793-1809 ◽  
Author(s):  
Y. Yamamoto ◽  
T. Takahashi ◽  
Y. Ishihara ◽  
Y. Kaiho ◽  
R. Arai ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Plate Boundary ◽  
Seismic Structure ◽  
Ryukyu Trench

scholarly journals Seismic structure of the northern end of the Ryukyu Trench subduction zone, southeast of Kyushu, Japan

2009 ◽  
Vol 61 (8) ◽  
pp. e37-e40 ◽  
Author(s):  
Azusa Nishizawa ◽  
Kentaro Kaneda ◽  
Mitsuhiro Oikawa
Keyword(s):  
Subduction Zone ◽  
Seismic Structure ◽  
Ryukyu Trench

Geodetic strain and the deformational history of the North Island of New Zealand during the late Cainozoic

1987 ◽  
Vol 321 (1557) ◽  
pp. 163-181 ◽  
Keyword(s):  
New Zealand ◽  
Subduction Zone ◽  
East Coast ◽  
Late Quaternary ◽  
Plate Boundary ◽  
Boundary Zone ◽  
Metamorphic Belt ◽  
Volcanic Region ◽  
The North ◽  
Plate Boundary Zone

The subduction zone under the east coast of the North Island of New Zealand comprises, from east to west, a frontal wedge, a fore-arc basin, uplifted basement forming the arc and the Central Volcanic Region. Reconstructions of the plate boundary zone for the Cainozoic from seafloor spreading data require the fore-arc basin to have rotated through 60° in the last 20 Ma which is confirmed by palaeomagnetic declination studies. Estimates of shear strain from geodetic data show that the fore-arc basin is rotating today and that it is under extension in the direction normal to the trend of the plate boundary zone. The extension is apparently achieved by normal faulting. Estimates of the amount of sediments accreted to the subduction zone exceed the volume of the frontal wedge: underplating by the excess sediments is suggested to be the cause of late Quaternary uplift of the fore-arc basin. Low-temperature—high-pressure metamorphism may therefore be occurring at depth on the east coast and high-temperature—low-pressure metamorphism is probable in the Central Volcanic Region. The North Island of New Zealand is therefore a likely setting for a paired metamorphic belt in the making.

How does the Alpine belt end between Spain and Morocco ?

2002 ◽  
Vol 173 (1) ◽  
pp. 3-15 ◽  
Author(s):  
André Michard ◽  
Ahmed Chalouan ◽  
Hugues Feinberg ◽  
Bruno Goffé ◽  
Raymond Montigny
Keyword(s):  
Subduction Zone ◽  
Plate Boundary ◽  
Western Alps ◽  
Late Eocene ◽  
African Plate ◽  
Northern Margin ◽  
Thrust Tectonics ◽  
Rif Belt ◽  
Transitional Crust ◽  
Roll Back

Abstract The Betic-Rif arcuate mountain belt (southern Spain, northern Morocco) has been interpreted as a symmetrical collisional orogen, partly collapsed through convective removal of its lithospheric mantle root, or else as resulting of the African plate subduction beneath Iberia, with further extension due either to slab break-off or to slab retreat. In both cases, the Betic-Rif orogen would show little continuity with the western Alps. However, it can be recognized in this belt a composite orocline which includes a deformed, exotic terrane, i.e. the Alboran Terrane, thrust through oceanic/transitional crust-floored units onto two distinct plates, i.e. the Iberian and African plates. During the Jurassic-Early Cretaceous, the yet undeformed Alboran Terrane was part of a larger, Alkapeca microcontinent bounded by two arms of the Tethyan-African oceanic domain, alike the Sesia-Margna Austroalpine block further to the northeast. Blueschist- and eclogite-facies metamorphism affected the Alkapeka northern margin and adjacent oceanic crust during the Late Cretaceous-Eocene interval. This testifies the occurrence of a SE-dipping subduction zone which is regarded as the SW projection of the western Alps subduction zone. During the late Eocene-Oligocene, the Alkapeca-Iberia collision triggered back-thrust tectonics, then NW-dipping subduction of the African margin beneath the Alboran Terrane. This Maghrebian-Apenninic subduction resulted in the Mediterranean basin opening, and drifting of the deformed Alkapeca fragments through slab roll back process and back-arc extension, as reported in several publications. In the Gibraltar area, the western tip of the Apenninic-Maghrebian subduction merges with that of the Alpine-Betic subduction zone, and their Neogene roll back resulted in the Alboran Terrane collage astride the Azores-Gibraltar transpressive plate boundary. Therefore, the Betic-Rif belt appears as an asymmetrical, subduction/collision orogen formed through a protracted evolution straightfully related to the Alpine-Apenninic mountain building.

Morphostructure of an incipient subduction zone along a transform plate boundary: Puysegur Ridge and Trench

Geology ◽  
1995 ◽  
Vol 23 (6) ◽  
pp. 519 ◽  
Author(s):  
Jean-Yves Collot ◽  
Geoffroy Lamarche ◽  
Ray A. Wood ◽  
Jean Delteil ◽  
Marc Sosson ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Plate Boundary ◽  
Transform Plate Boundary

scholarly journals Deep seismic structure of the Tonga subduction zone: Implications for mantle hydration, tectonic erosion, and arc magmatism

2011 ◽  
Vol 116 (B10) ◽  
Author(s):  
Eduardo Contreras-Reyes ◽  
Ingo Grevemeyer ◽  
Anthony B. Watts ◽  
Ernst R. Flueh ◽  
Christine Peirce ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Arc Magmatism ◽  
Seismic Structure ◽  
Tonga Subduction Zone ◽  
Tectonic Erosion
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