High heat flow anomalies on an old oceanic plate observed seaward of the Japan Trench

  title={High heat flow anomalies on an old oceanic plate observed seaward of the Japan Trench},
  author={Makoto Yamano and Masataka Kinoshita and Shusaku Goto},
  journal={International Journal of Earth Sciences},
Thirty-three new measurements on the seaward slope and outer rise of the Japan Trench along a parallel of 38°45′N revealed the existence of high heat flow anomalies on the subducting Pacific plate, where the seafloor age is about 135 m.y.. The most prominent anomaly with the highest value of 114 mW/m2 is associated with a small mound on the outer rise, which was reported to be a kind of mud volcano. On the seaward slope of the trench, heat flow is variable: high (70–90 mW/m2) at some locations… Expand
Heat flow anomaly on the seaward side of the Japan Trench associated with deformation of the incoming Pacific plate
Abstract Extensive heat flow measurements were conducted on the seaward side of the Japan Trench for investigation of the extent and the origin of high heat flow previously found on the incomingExpand
Multiple‐scale hydrothermal circulation in 135 Ma oceanic crust of the Japan Trench outer rise: Numerical models constrained with heat flow observations
Anomalous high heat flow is observed within 150 km seaward of the trench axis at the Japan Trench offshore of Sanriku, where the old Pacific Plate (∼135 Ma) is subducting. Individual heat flow valuesExpand
Hydrothermal heat mining in an incoming oceanic plate due to aquifer thickening: Explaining the high heat flow anomaly observed around the Japan Trench
To explain the origin of a high heat flow anomaly observed within 150 km seaward of the Japan Trench, we construct a thermal model for an oceanic plate prior to subduction that includes the effect ofExpand
Variations in the thermal conductivities of surface sediments in the Nankai subduction zone off Tokai, central Japan
We investigated the relationship between variations in the thermal conductivity of surface sediments and the topography in the Nankai subduction zone off Tokai, central Japan, the easternmost part ofExpand
Runaway slip to the trench due to rupture of highly pressurized megathrust beneath the middle trench slope: The tsunamigenesis of the 2011 Tohoku earthquake off the east coast of northern Japan
Abstract The gigantic 2011, March 11 Mw 9 Tohoku earthquake is examined from the viewpoint of the pre-seismic forearc structure, the seismic reflection properties of a megathrust around the usualExpand
Distributions of gas hydrate and free gas accumulations associated with upward fluid flow in the Sanriku-Oki forearc basin, northeast Japan
Abstract We applied automated velocity analysis to a 3D seismic data volume to obtain a high-resolution seismic velocity model that we used to investigate the influence of fluid behavior on theExpand
Extension of continental crust by anelastic deformation during the 2011 Tohoku-oki earthquake: The role of extensional faulting in the generation of a great tsunami
Abstract Observations of seafloor morphologies and environments made before and after the 2011 Tohoku-oki earthquake reveal open fissures, generated during the earthquake, where the fault trace isExpand
Review of Oceanic Crustal Structure and Seafloor Hydrothermal Circulation
Seafloor hydrothermal systems are important in relation to global heat and chemical fluxes as well as the distribution of microbial communities within the oceanic crust. From a global context,Expand
Silica diagenesis and its effect on interplate seismicity in cold subduction zones
Abstract The diagenesis and deformation processes of ribbon cherts embedded in a Jurassic accretionary complex, central Japan, were investigated in detail to gain a better understanding of theExpand
Melt-rich lithosphere-asthenosphere boundary inferred from petit-spot volcanoes
Young basaltic knolls have been discovered on the old oceanic lithosphere, namely petit-spot volcanoes. Based on their geochemical signatures, they have presumably originated from partial melts inExpand


Mud ridge on the crest of the outer swell off Japan Trench
Abstract A small mound of sediment was found on the deep ocean floor by a swath mapping survey associated with 3.5 kHz subbottom profiling on the outer swell east off the Japan Trench at a depth ofExpand
Heat flow, tectonics, and fluid circulation at the toe of the Barbados ridge accretionary prism
Detailed patterns of near surface tectonics and heat flow were investigated at two locations at the toe of the Barbados Ridge accretionary prism. At the two locations, in the thickly sedimentedExpand
Fluid flow in and around a mud volcano field seaward of the Barbados accretionary wedge: Results from Manon cruise
A field of mud diapirs and mud volcanoes situated in the Barbados trench at 13°50′N and extending along an old oceanic fracture zone (Mercurus) was investigated during the Manon cruise using bothExpand
Outer slope faulting associated with the western Kuril and Japan trenches
SUMMARY Elongated fault escarpments on the outer slopes of the western Kuril and Japan trenches have been investigated through detailed swath bathymetric mapping. Numerous horsts and grabens formedExpand
Tectonic features of the Japan Trench convergent margin off Sanriku, northeastern Japan, revealed by multichannel seismic reflection data
Near the Japan Trench convergent plate margin the seaward edge of the continental plate is deformed by subduction of the oceanic plate. We report the results of a multichannel seismic survey in theExpand
The heat flow through oceanic and continental crust and the heat loss of the Earth
Simple thermal models based on the creation and cooling of the lithosphere can account for the observed subsidence of the ocean floor and the measured decreased in heat flow with age. InExpand
An unequivocal case for high Nusselt number hydrothermal convection in sediment-buried igneous oceanic crust
New observations of seafloor heat flow, precisely located along seismic reflection profiles crossing a buried ridge on the eastern flank of the Juan de Fuca Ridge, show a nearly exact inverseExpand
Terrestrial heat flow in Japan
Terrestrial heat flow has been determined at 58 localities (39 on land and 19 in the sea) in and around the Japanese Islands. The average values of observed heat flow on land and in the sea are 1.55Expand
Models of hydrothermal circulation within 106 Ma seafloor : constraints on the vigor of fluid circulation and crustal properties, below the Madeira Abyssal Plain
Heat flow measurements colocated with seismic data across 106 Ma seafloor of the Madeira Abyssal Plain (MAP) reveal variations in seafloor heat flow of ±10–20% that are positively correlated withExpand
Abstract A multi-channel seismic survey (MCS) yields high resolution images of geologic structures within the Oregon accretionary prism. In addition to revealing the internal geometry of the prism aExpand