scholarly journals Bending of the subducting oceanic plate and its implication for rupture propagation of large interplate earthquakes off Miyagi, Japan, in the Japan Trench subduction zone

2005 ◽  
Vol 32 (5) ◽  
Author(s):  
Aki Ito
Keyword(s):  
Subduction Zone ◽  
Japan Trench ◽  
Rupture Propagation ◽  
Oceanic Plate ◽  
Interplate Earthquakes

Prevalence of updip rupture propagation in interplate earthquakes along the Japan Trench

2021 ◽  
Author(s):  
Keisuke Yoshida ◽  
Naoki Uchida ◽  
Hisahiko Kubo ◽  
Ryota Takagi ◽  
Shiqing Xu
Keyword(s):  
Japan Trench ◽  
Rupture Propagation ◽  
Interplate Earthquakes

scholarly journals Prevalence of updip rupture propagation in interplate earthquakes along the Japan trench

2022 ◽  
Vol 578 ◽  
pp. 117306
Author(s):  
Keisuke Yoshida ◽  
Naoki Uchida ◽  
Hisahiko Kubo ◽  
Ryota Takagi ◽  
Shiqing Xu
Keyword(s):  
Japan Trench ◽  
Rupture Propagation ◽  
Interplate Earthquakes

scholarly journals Mantle-derived helium released through the Japan trench bend-faults

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Jin-Oh Park ◽  
Naoto Takahata ◽  
Ehsan Jamali Hondori ◽  
Asuka Yamaguchi ◽  
Takanori Kagoshima ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Large Scale ◽  
Japan Trench ◽  
Helium Isotope ◽  
Normal Faults ◽  
Circulation System ◽  
Deep Penetration ◽  
Oceanic Plate ◽  
Seismic Reflection Data ◽  
Reflection Data

AbstractPlate bending-related normal faults (i.e. bend-faults) develop at the outer trench-slope of the oceanic plate incoming into the subduction zone. Numerous geophysical studies and numerical simulations suggest that bend-faults play a key role by providing pathways for seawater to flow into the oceanic crust and the upper mantle, thereby promoting hydration of the oceanic plate. However, deep penetration of seawater along bend-faults remains controversial because fluids that have percolated down into the mantle are difficult to detect. This report presents anomalously high helium isotope (3He/4He) ratios in sediment pore water and seismic reflection data which suggest fluid infiltration into the upper mantle and subsequent outflow through bend-faults across the outer slope of the Japan trench. The 3He/4He and 4He/20Ne ratios at sites near-trench bend-faults, which are close to the isotopic ratios of bottom seawater, are almost constant with depth, supporting local seawater inflow. Our findings provide the first reported evidence for a potentially large-scale active hydrothermal circulation system through bend-faults across the Moho (crust-mantle boundary) in and out of the oceanic lithospheric mantle.

Structure of the Japan Trench subduction zone, from multi-channel seismic-reflection records

1980 ◽  
Vol 35 (1-3) ◽  
pp. 171-182 ◽  
Author(s):  
Akira Matsuzawa ◽  
Toshiro Tamano ◽  
Yutaka Aoki ◽  
Takeshi Ikawa
Keyword(s):  
Subduction Zone ◽  
Seismic Reflection ◽  
Japan Trench

FDM Simulation of an Anomalous Later Phase from the Japan Trench Subduction Zone Earthquakes

2011 ◽  
Vol 170 (1-2) ◽  
pp. 95-108 ◽  
Author(s):  
Shinako Noguchi ◽  
Takuto Maeda ◽  
Takashi Furumura
Keyword(s):  
Subduction Zone ◽  
Japan Trench ◽  
Subduction Zone Earthquakes ◽  
Later Phase

scholarly journals Bathymetry of the Indonesian Sunda margin-relating morphological features of the upper plate slopes to the location and extent of the seismogenic zone

2010 ◽  
Vol 10 (9) ◽  
pp. 1899-1911 ◽  
Author(s):  
A. Krabbenhoeft ◽  
R. W. Weinrebe ◽  
H. Kopp ◽  
E. R. Flueh ◽  
S. Ladage ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Sea Level ◽  
Transition Zone ◽  
Morphological Features ◽  
Seismogenic Zone ◽  
Oceanic Plate ◽  
Bathymetric Data ◽  
Great Earthquakes ◽  
Comparable Magnitude

Abstract. Earthquake history shows that the Sunda subduction zone of the Indonesian margin produces great earthquakes offshore Sumatra, whereas earthquakes of comparable magnitude are lacking offshore Java and the Lesser Sunda islands. Morphological structures in multibeam bathymetric data across the forearc relate with the extent of the seismogenic zone. Its updip limit corresponds to the slope break, most distinct off Java and Lesser Sunda islands, where we find coincident narrow, uniform, continuous outer arc ridges. Their landward termination and a shallow upper plate mantle mark the downdip limit of the seismogenic zone. In contrast the outer arc ridges off Sumatra are wider and partly elevated above sea level forming the forearc islands. The downdip limit of the seismogenic zone coincides with a deeper upper plate mantle. Sunda Strait marks a transition zone between the Sumatra and Java margins. We find the differences along the Sunda margin, especially the wider extent of the seismogenic zone off Sumatra, producing larger earthquakes, to result from the interaction of different age and subduction direction of the oceanic plate. We attribute a major role to the sediment income and continental/oceanic upper plate nature of Sumatra/Java influencing the composition and deformation style along the forearc and subduction fault.

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