scholarly journals Three-dimensional electromagnetic imaging of upwelling fluids in the Kyushu subduction zone, Japan

2015 ◽  
Vol 120 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Maki Hata ◽  
Naoto Oshiman ◽  
Ryokei Yoshimura ◽  
Yoshikazu Tanaka ◽  
Makoto Uyeshima
Keyword(s):  
Subduction Zone ◽  
Three Dimensional ◽  
Electromagnetic Imaging

scholarly journals Interseismic deformation of the Nankai subduction zone, southwest Japan, inferred from three-dimensional crustal velocity fields

2007 ◽  
Vol 59 (10) ◽  
pp. 1073-1082 ◽  
Author(s):  
Takao Tabei ◽  
Mari Adachi ◽  
Shin’ichi Miyazaki ◽  
Tsuyoshi Watanabe ◽  
Sayomasa Kato
Keyword(s):  
Subduction Zone ◽  
Three Dimensional ◽  
Velocity Fields ◽  
Southwest Japan ◽  
Crustal Velocity ◽  
Interseismic Deformation ◽  
Nankai Subduction Zone

Three-dimensional electromagnetic imaging of dielectric scatterers

1996 ◽  
Vol 10 (7) ◽  
pp. 955-972
Author(s):  
P. Chaturvedi ◽  
R.G. Plumb ◽  
Z. Huang ◽  
K.R. Demarest
Keyword(s):  
Three Dimensional ◽  
Electromagnetic Imaging

Deep electrical structure of northern Alberta (Canada): implications for diamond exploration

2009 ◽  
Vol 46 (2) ◽  
pp. 139-154 ◽  
Author(s):  
Erşan Türkoğlu ◽  
Martyn Unsworth ◽  
Dinu Pana
Keyword(s):  
Subduction Zone ◽  
Upper Mantle ◽  
Lithospheric Mantle ◽  
Three Dimensional ◽  
Diamond Formation ◽  
Magnetotelluric Data ◽  
Diamond Exploration ◽  
Upper Mantle Structure ◽  
Resistivity Model ◽  
Northern Alberta

Geophysical studies of upper mantle structure can provide constraints on diamond formation. Teleseismic and magnetotelluric data can be used in diamond exploration by mapping the depth of the lithosphere–asthenosphere boundary. Studies in the central Slave Craton and at Fort-à-la-Corne have detected conductors in the lithospheric mantle close to, or beneath, diamondiferous kimberlites. Graphite can potentially explain the enhanced conductivity and may imply the presence of diamonds at greater depth. Petrologic arguments suggest that the shallow lithospheric mantle may be too oxidized to contain graphite. Other diamond-bearing regions show no upper mantle conductor suggesting that the correlation with diamondiferous kimberlites is not universal. The Buffalo Head Hills in Alberta host diamondiferous kimberlites in a Proterozoic terrane and may have formed in a subduction zone setting. Long period magnetotelluric data were used to investigate the upper mantle resistivity structure of this region. Magnetotelluric (MT) data were recorded at 23 locations on a north–south profile extending from Fort Vermilion to Utikuma Lake and an east–west profile at 57.2°N. The data were combined with Lithoprobe MT data and inverted to produce a three-dimensional (3-D) resistivity model with the asthenosphere at 180–220 km depth. This model did not contain an upper mantle conductor beneath the Buffalo Head Hills kimberlites. The 3-D inversion exhibited an eastward dipping conductor in the crust beneath the Kiskatinaw terrane that could represent the fossil subduction zone that supplied the carbon for diamond formation. The low resistivity at crustal depths in this structure is likely due to graphite derived from subducted organic material.

scholarly journals Illuminating subduction zone rheological properties in the wake of a giant earthquake

2019 ◽  
Vol 5 (12) ◽  
pp. eaax6720 ◽  
Author(s):  
Jonathan R. Weiss ◽  
Qiang Qiu ◽  
Sylvain Barbot ◽  
Tim J. Wright ◽  
James H. Foster ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Subduction Zones ◽  
Three Dimensional ◽  
Surface Strain ◽  
Postseismic Deformation ◽  
Crust And Upper Mantle ◽  
Plate Convergence ◽  
Maule Earthquake ◽  
History Of ◽  
Dependent Viscosity

Deformation associated with plate convergence at subduction zones is accommodated by a complex system involving fault slip and viscoelastic flow. These processes have proven difficult to disentangle. The 2010 Mw 8.8 Maule earthquake occurred close to the Chilean coast within a dense network of continuously recording Global Positioning System stations, which provide a comprehensive history of surface strain. We use these data to assemble a detailed picture of a structurally controlled megathrust fault frictional patchwork and the three-dimensional rheological and time-dependent viscosity structure of the lower crust and upper mantle, all of which control the relative importance of afterslip and viscoelastic relaxation during postseismic deformation. These results enhance our understanding of subduction dynamics including the interplay of localized and distributed deformation during the subduction zone earthquake cycle.

Three dimensional radio-frequency electromagnetic imaging of an in-bin grain conditioning process

2019 ◽  
Vol 167 ◽  
pp. 105059 ◽  
Author(s):  
Colin Gilmore ◽  
Mohammad Asefi ◽  
Kyle Nemez ◽  
Jitendra Paliwal ◽  
Joe LoVetri
Keyword(s):  
Radio Frequency ◽  
Three Dimensional ◽  
Electromagnetic Imaging ◽  
Conditioning Process

scholarly journals Three-dimensional elastic wave speeds in the northern Chile subduction zone: variations in hydration in the supraslab mantle

2016 ◽  
Vol 207 (2) ◽  
pp. 1080-1105 ◽  
Author(s):  
Diana Comte ◽  
Daniel Carrizo ◽  
Steven Roecker ◽  
Francisco Ortega-Culaciati ◽  
Sophie Peyrat
Keyword(s):  
Elastic Wave ◽  
Subduction Zone ◽  
Three Dimensional ◽  
Northern Chile ◽  
Wave Speeds

scholarly journals Fluid Transport and Storage in the Cascadia Forearc inferred from Magnetotelluric Data

2021 ◽  
Author(s):  
Gary Egbert ◽  
Bo Yang ◽  
Paul A. Bedrosian ◽  
Kerry Key ◽  
Dean Livelybrooks ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Subduction Zone ◽  
Fluid Transport ◽  
Critical Role ◽  
Three Dimensional ◽  
Oceanic Lithosphere ◽  
Cascadia Subduction Zone ◽  
Plate Interface ◽  
Magnetotelluric Data ◽  
And Storage

Abstract Subduction of hydrated oceanic lithosphere can carry water deep into the Earth, with important consequences for a range of tectonic and magmatic processes. Most fluid is released at relatively shallow depths in the forearc where it is thought to play a critical role in controlling mechanical properties and seismic behavior of the subduction megathrust. Here we present results from three-dimensional inversion of nearly 400 long-period magnetotelluric sites, including 64 offshore, to provide new insights into the distribution of fluids in the forearc of the Cascadia subduction zone. Our amphibious dataset provides new constraints on the geometry of the electrically resistive Siletzia terrane, a thickened section of oceanic crust accreted to North America in the Eocene, and the conductive accretionary complex, which is being underthrust all along the margin. Fluids accumulate, over time-scales likely exceeding 1 My, above the plate interface in metasedimentary units, while the mafic rocks of Siletzia remain dry. Fluids in metasediments tend to peak at fixed slab-depths of 17.5 and 30 km, suggesting control by metamorphic processes, but also concentrate around the edges of Siletzia, suggesting that this mafic block is impermeable, with dehydration fluids escaping up-dip along the megathrust. Our results demonstrate that lithology of the overriding crust can play a critical role in controlling fluid transport and sequestration in a subduction zone, with potentially important implications for mechanical properties.

Three‐Dimensional Modeling of Spontaneous and Triggered Slow‐Slip Events at the Hikurangi Subduction Zone, New Zealand

2019 ◽  
Vol 124 (12) ◽  
pp. 13250-13268 ◽  
Author(s):  
Bunichiro Shibazaki ◽  
Laura M. Wallace ◽  
Yoshihiro Kaneko ◽  
Ian Hamling ◽  
Yoshihiro Ito ◽  
...  
Keyword(s):  
New Zealand ◽  
Subduction Zone ◽  
Three Dimensional ◽  
Slow Slip ◽  
Slow Slip Events ◽  
Three Dimensional Modeling ◽  
Dimensional Modeling
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