Earth, Planets and Space 2015 67:46
Published on: 1 April 2015
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Edited by: Tatsuhiko Kawamoto, Stephen Kirby, Junichi Nakajima, Bruno Reynard, Hiroaki Toh
Geofluids liberated from the subducting plates migrate upward and play vital roles in various subduction zone phenomena, such as magma genesis, earthquake mechanisms, crustal deformation, ore deposition etc. Geofluids and the processes they are involved in subduction zones also greatly affect the mantle dynamics, including global material circulation and chemical differentiation, and the entrance of CHO fluids into the Earth's interior.
Publication started: 1 April 2014
Publication finished: 1 April 2015
Earth, Planets and Space 2015 67:46
Published on: 1 April 2015
We analyzed the 3-D resistivity structure beneath Naruko volcano, northeastern Japan, with the aim of imaging 3-D distribution of fluids in the crust for its volcanic and seismogenic implications. The data wer...
Earth, Planets and Space 2014 66:158
Published on: 4 December 2014
We studied the origin of deep groundwater in the Joban and Hamadori areas in southern Tohoku, Japan, based on δD, δ18O, 129I/I, 36Cl/Cl, and 3H concentrations. Deep groundwater was collected from the basement roc...
Earth, Planets and Space 2014 66:131
Published on: 20 October 2014
The variation in water content of arc basaltic magmas in the Northeast Japan arc and the Izu arc was estimated using a simple plagioclase phenocryst hygrometer. In order to construct a plagioclase phenocryst h...
Earth, Planets and Space 2014 66:127
Published on: 29 September 2014
Non-volcanic hot springs are generally believed to originate through circulation of meteoric or buried sea water heated at depth. In this study, we report the geochemical characteristics of the Arima and Takar...
Earth, Planets and Space 2014 66:119
Published on: 19 September 2014
Geofluids is important for understanding volcanic and earthquake generation processes. In this study, we obtained a detailed seismic velocity structure in and around the Naruko volcano, northeastern Japan, usi...
Earth, Planets and Space 2014 66:114
Published on: 10 September 2014
A better understanding of fluid-related processes such as poroelastic rebound of the upper crust and weakening of the lower crust beneath the volcanic arc helps better understand and correctly interpret the he...
Earth, Planets and Space 2014 66:106
Published on: 2 September 2014
The composition of continental subduction-zone fluids varies dramatically from dilute aqueous solutions at subsolidus conditions to hydrous silicate melts at supersolidus conditions, with variable concentratio...
Earth, Planets and Space 2014 66:93
Published on: 18 August 2014
To understand the mechanism of an intensive non-volcanic seismic swarm in the Kii Peninsula, Japan, we used a dense seismic linear array to measure fine-scale variations of seismic velocities and converted tel...
Earth, Planets and Space 2014 66:86
Published on: 4 August 2014
Investigation of olivine-hosted melt inclusions provides information about the abundance of volatile elements that are often lost during subaerial eruptions of lavas. We have measured the abundances of H2O, CO2, ...
Earth, Planets and Space 2014 66:81
Published on: 1 August 2014
A recent microphysical model for the steady-state frictional behaviour of wet illite/quartz gouges in subduction megathrust settings predicts that velocity-weakening in the seismogenic zone results from a comp...
Earth, Planets and Space 2014 66:78
Published on: 28 July 2014
The 2011 off the Pacific coast of Tohoku (Tohoku-oki) earthquake caused increased seismicity in many inland areas in Japan. A seismic cluster north of the Moriyoshi-zan volcano in Akita prefecture, Tohoku Dist...
Earth, Planets and Space 2014 66:77
Published on: 25 July 2014
A strength profile across the NE Japan interplate megathrust was constructed in the source region of the 2011 Tohoku-oki earthquake (Mw9.0) using friction, fracturing, and ductile flow data of the oceanic crustal...
Earth, Planets and Space 2014 66:73
Published on: 18 July 2014
At the western side of the Hidaka Mountain range in Hokkaido, we identify a clear later phase in seismograms for earthquakes occurring at the uppermost part of the Pacific slab beneath the eastern Hokkaido. Th...
Earth, Planets and Space 2014 66:69
Published on: 11 July 2014
Recent research indicates that the shallow mantle of the Cascadia subduction margin under near-coastal Pacific Northwest, USA is cold and partially serpentinized, storing large quantities of water in this wedg...
Earth, Planets and Space 2014 66:67
Published on: 7 July 2014
Geochemical signatures of arc basalts can be explained by addition of aqueous fluids, melts, and/or supercritical fluids from the subducting slab to the sub-arc mantle. Partitioning of large-ion lithophile ele...
Earth, Planets and Space 2014 66:61
Published on: 27 June 2014
Titanian clinohumite is an accessory phase found in peridotites, and it can be a key repository of volatile and other trace elements in sub-arc mantle. To characterize spectroscopic variations due to volatile ...
Earth, Planets and Space 2014 66:60
Published on: 26 June 2014
The pore fluid pressure distribution in the focal region of the 2008 Iwate-Miyagi Nairiku earthquake was investigated through an analysis of the diversity of focal mechanisms. We inverted stress orientations a...
Earth, Planets and Space 2014 66:59
Published on: 20 June 2014
To understand the effect of plate coupling on very low-frequency event (VLFE) activity resulting from megathrust earthquakes, we performed long-term multiscale earthquake cycle simulations (including a megathr...
Earth, Planets and Space 2014 66:55
Published on: 16 June 2014
The 2008 Iwate-Miyagi Nairiku earthquake (M 7.2) was a shallow inland earthquake that occurred in the volcanic front of the northeastern Japan arc. To understand why the earthquake occurred beneath an active v...
Earth, Planets and Space 2014 66:50
Published on: 10 June 2014
The slab-mantle interface in subduction zones is a site of tectonic mixing of crustal and mantle rocks. It is the interface for fluid flow of slab-derived components into the mantle wedge. To assess the fluid-...
Earth, Planets and Space 2014 66:47
Published on: 4 June 2014
The Lindås Nappe, Bergen Arc, is located in western Norway and displays two high-grade metamorphic structures. A Precambrian granulite facies foliation is transected by Caledonian fluid-induced eclogite-facies...
Earth, Planets and Space 2014 66:46
Published on: 2 June 2014
The three-dimensional distribution of fluids and melts under the NE Japan arc was imaged using its resistivity structure, modeled with geomagnetic transfer functions. The data were collected at 37 stations loc...
Earth, Planets and Space 2014 66:39
Published on: 27 May 2014
By enhancing mass transfer and energy release, the cycle of volatiles and melt is a major component of subduction. Investigating this fluid cycle is therefore critical to understand the past and current activi...
Earth, Planets and Space 2014 66:38
Published on: 23 May 2014
Carbon dioxide and methane are major components in geofluids; however, there is little evidence showing how C-H-O fluids evolve in a subduction zone. We investigated fluid inclusions in quartz veins from the E...
Earth, Planets and Space 2014 66:33
Published on: 15 May 2014
Compressional wave velocities (V p) in quartz aggregate were measured to quantify the effect of pore fluid (H2O) on V p at high pressure-temperature (P-T). Ultrasonic measurements were conducted on dry and wet qu...
Earth, Planets and Space 2014 66:35
Published on: 15 May 2014
We performed melting experiments of hydrous pyrolite at pressures from 3 to 8 GPa and temperatures from 1,100°C to 1,800°C to identify the origin of chemical variation in cratonic garnet peridotites with high ...
Earth, Planets and Space 2014 66:29
Published on: 1 May 2014
This study presents the first numerical model for trace element transportation associated with dehydration and fluid migration from the subducting slab and aims to incorporate both fluid dynamical processes (e...
Earth, Planets and Space 2014 66:26
Published on: 30 April 2014
Island arc low-K tholeiites are basaltic magmas erupting from frontal arc volcanoes of juvenile arcs associated with the subduction of old and cold plates. We investigated the origins of geochemical variation ...
Earth, Planets and Space 2014 66:15
Published on: 22 April 2014
The three-dimensional (3-D) P-wave attenuation (Q p -1) structure beneath Kanto, Japan, is estimated by using a large number of waveform data. Corner frequencies of earthquakes a...
Earth, Planets and Space 2014 66:12
Published on: 16 April 2014
We applied the Markov random field model, which is a kind of a Bayesian probabilistic method, to the spatial inversion of the porosity and pore shape in rocks from an observed seismic structure. Gaussian Marko...
Earth, Planets and Space 2014 66:5
Published on: 7 April 2014
The electrical conductivity of brine-bearing quartzite with fluid fractions of 0.19 to 0.30 and salinity of 3 to 17 wt.% was measured at 800 to 1,100 K and 1 GPa. The conductivity of the brine-bearing quartzit...
Earth, Planets and Space 2014 66:2
Published on: 1 April 2014