Results 61 to 70 of about 350 (172)

Frictional and hydrologic properties of a major splay fault system, Nankai subduction zone [PDF]

Geophysical Research Letters, 2009
We report on laboratory experiments examining the frictional and hydrologic properties of fault gouge and wall rock along a borehole transect that crosses a major out‐of‐sequence thrust splay fault within the Nankai accretionary complex. At 25 MPa effective normal stress, the fault zone material is frictionally weak (μ ≤ 0.44) and exhibits low ...
Matt J. Ikari, Demian M. Saffer, Chris Marone   +2 more
openaire   +1 more source

Interface Deformation, Exhumation, and Underplating: The Role of Plate Velocity Changes Throughout the Evolution of a Subduction Zone

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Exhumed metamorphic rocks yield critical insights into the mechanical, chemical, and thermal structure of the plate interface that can be used to infer exhumation pathways and their evolution throughout a subduction zone's lifetime. Metamorphosed oceanic rocks often record exhumation and underplating over relatively punctuated time periods ...
Valeria Turino, Adam F. Holt, Derek J. Neuharth, Ryan K. Stoner, Whitney M. Behr   +4 more
wiley   +1 more source

Evolution of Pore Fluid Pressure in an Accretionary Outer Wedge Over Megathrust Earthquake Cycles: The Northern Cascadia Example

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
The evolution of pore fluid pressure ( Pf$P_{\mathrm{f}}$) in the most seaward portion of a subduction accretionary prism plays an essential role in the cycle of tsunamigenic earthquakes. Based on recent geophysical observations, here we propose a testable conceptual model for this evolution for northern Cascadia offshore of Washington.
Tianhaozhe Sun, Kelin Wang
wiley   +1 more source

Precise tilt measurement by seafloor borehole tiltmeters at the Nankai Trough subduction zone

Earth, Planets and Space, 2023
In this study, geodetic and seismic phenomena occurring in the subduction zone were observed with two tiltmeters that were installed in seafloor boreholes drilled in the Kumano Basin in the Nankai Trough, southwest Japan.
Shuhei Tsuji, Eiichiro Araki, Takashi Yokobiki, Shuhei Nishida, Yuya Machida, Mark Zumberge, Keisuke Takahashi   +6 more
doaj   +1 more source

Interseismic deformation at the Nankai subduction zone and the Median Tectonic Line, southwest Japan [PDF]

Journal of Geophysical Research: Solid Earth, 2003
GPS velocities in the vicinity of the Nankai Trough, southwest Japan, were inverted into three components: interplate loading due to Nankai Trough subduction, deformation associated with deep slip on the Median Tectonic Line (MTL), and the residual rigid plate motion.
Yosuke Aoki, Christopher H. Scholz
openaire   +1 more source

Metamorphic Dehydration, Fluid Pressure, and the Frictional‐Viscous Transition Along Subduction Megathrusts: Case Study in Cascadia and Implications for Slow Earthquakes

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Relative plate motion in subduction zones transitions from frictional slip to viscous flow with increasing depth and temperature. The frictional‐viscous transition can control the depth extent of megathrust earthquakes and episodic tremor and slip (ETS).
So Ozawa, Eric M. Dunham, Cailey B. Condit   +2 more
wiley   +1 more source

Moment tensor inversion of the 2016 southeast offshore Mie earthquake in the Tonankai region using a three-dimensional velocity structure model: effects of the accretionary prism and subducting oceanic plate

Earth, Planets and Space, 2018
The southeast offshore Mie earthquake occurred on April 1, 2016 near the rupture area of the 1944 Tonankai earthquake, where seismicity around the interface of the Philippine Sea plate had been very low until this earthquake.
Shunsuke Takemura, Takeshi Kimura, Tatsuhiko Saito, Hisahiko Kubo, Katsuhiko Shiomi   +4 more
doaj   +1 more source

Precise Temperature Measurements and Long‐Term Observations Revealed an Almost‐Constant Temperature Zone in a Vertical 700‐m‐Deep Borehole in the Aso Volcanic Region

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 6, June 2026.
Abstract To determine the subsurface temperature distribution and its relevance to groundwater flow in the deep subsurface, we repeated temperature depth profile measurements and conducted long‐term temperature observations in an ∼700‐m‐deep borehole penetrating the Futagawa fault along the Kiyama–Kashima graben in the Aso volcanic region, Japan from ...
Weiren Lin, Susumu Shibutani, Shuai Feng, Nana Kamiya, Kazuya Ishitsuka, Xiaoqiu Yang, Yutaro Shigemitsu, Yupeng Cao, Koichiro Sado   +8 more
wiley   +1 more source

P wave anisotropic tomography of the Nankai subduction zone in Southwest Japan

Geochemistry, Geophysics, Geosystems, 2012
The active subduction of the young Philippine Sea (PHS) plate and the old Pacific plate has resulted in significant seismic heterogeneity and anisotropy in Southwest (SW) Japan. In this work we determined a detailed 3‐D P wave anisotropic tomography of the crust and upper mantle beneath SW Japan using ∼540,000 P wave arrival times from 5,249 local ...
Jian Wang, Dapeng Zhao
openaire   +1 more source

Anisotropic Permeability Pathways Controlled by Intraslab Stress Heterogeneity in the Philippine Sea Slab Beneath the Ryukyu Arc

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Intermediate‐depth intraslab earthquakes in the Philippine Sea Plate occur at depths of 100–200 km beneath the Ryukyu Arc and are widely interpreted as manifestations of slab dehydration; however, the spatial variability in continuity of the volcanic front and the asymmetric distribution of volcanic activity are poorly explained by existing ...
Makoto Otsubo, Ayumu Miyakawa
wiley   +1 more source