Fractal analysis of experimentally, dynamically recrystallized quartz grains and its possible application as a strain rate meter

M Takahashi, H Nagahama, T Masuda… - Journal of structural …, 1998 - Elsevier
Fractal analysis of experimentally recrystallized quartz grain shapes has been employed to
study the relationship between the microstructures of dynamically recrystallized quartz grains …

[HTML][HTML] Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake

J Muto, Y Yasuoka, N Miura, D Iwata, H Nagahama… - Scientific reports, 2021 - nature.com
Despite the challenges in identifying earthquake precursors in intraplate (inland) earthquakes,
various hydrological and geochemical measurements have been conducted to establish …

An argument against the crush origin of pseudotachylytes based on the analysis of clast-size distribution

T Shimamoto, H Nagahama - Journal of Structural Geology, 1992 - Elsevier
The origin of pseudotachylytes has been controversial since Wenk cast doubt on the melt
origin of the matrix of pseudotachylytes, in 1978. The matrix of this rock is so fine grained that …

Voltage changes induced by stick‐slip of granites

A Takeuchi, H Nagahama - Geophysical research letters, 2001 - Wiley Online Library
Tri‐axial compression tests of dry granites with a pre‐cut shear surface were conducted with
an electrode to detect electrical potential. The samples were shaped 19.5 mm in diameter …

Changes in magnetic and fractal properties of fractured granites near the Nojima Fault, Japan

N Nakamura, H Nagahama - Island Arc, 2001 - Wiley Online Library
Anisotropy of magnetic susceptibility (AMS) has been used to infer finite strain fabrics in
plastically deformed rocks, but there are few studies of magnetic properties in fractured fault …

[BOOK][B] Physics of asymmetric continuum: Extreme and fracture processes

R Teisseyre, H Nagahama, E Majewski - 2008 - Springer
M. Takeo, and E. Majewski, eds, Springer 2006). Some problems, concerned primarily but
not exclusively with the basic theoretical nature, have appeared to us as worthy of further …

Cumulative Benioff strain-release, modified Omori's law and transient behaviour of rocks

Y Kawada, H Nagahama - Tectonophysics, 2006 - Elsevier
Irreversible thermodynamic theories with internal state variables can be used to derive a
general constitutive law for both transient and steady-state behaviours of rocks. This constitutive …

Enhancement of ductile deformation in polycrystalline anorthite due to the addition of water

…, J Muto, S Koizumi, S Sawa, H Nagahama - Journal of Structural …, 2022 - Elsevier
We performed shear deformation experiments on synthetic anorthite (An) aggregates with
various amounts of water added externally. The samples were pure An aggregates and …

Finsler geometry of seismic ray path in anisotropic media

T Yajima, H Nagahama - Proceedings of the Royal …, 2009 - royalsocietypublishing.org
The seismic ray theory in anisotropic inhomogeneous media is studied based on non-Euclidean
geometry called Finsler geometry. For a two-dimensional ray path, the seismic …

[HTML][HTML] Radon degassing triggered by tidal loading before an earthquake

Y Omori, H Nagahama, Y Yasuoka, J Muto - Scientific reports, 2021 - nature.com
The presence of anomalous geochemical changes related to earthquakes has been
controversial despite widespread, long time challenges for earthquake prediction. Establishing a …