2026 — 地学雑誌 (Journal of Geography)
東北沖地震の余効変動から知る東北日本弧地殻マントルのレオロジー特性
A comprehensive review of crust-mantle rheological properties beneath the NE Japan arc, as constrained by postseismic deformation following the 2011 Tohoku-Oki earthquake. This paper synthesizes over a decade of GNSS-based geodetic observations and rock-mechanics-based numerical modeling to characterize the heterogeneous viscosity structure of the island arc system.
2025 — J. Geophys. Res. Solid Earth
Inferring 3-D Rheology of Low-Viscosity Zone Around Quaternary Volcanoes of NE Japan from Postseismic Deformation of the 2011 Tohoku-Oki Earthquake
Three-dimensional inversion of postseismic GNSS data reveals localized low-viscosity zones beneath Quaternary volcanoes of NE Japan. The 3-D rheological structure provides constraints on the thermal and fluid conditions beneath the volcanic arc, demonstrating that postseismic geodetic observations can resolve sub-arc mantle heterogeneity.
2023 — Geophys. Res. Lett.
Function Model Based on Nonlinear Transient Rheology of Rocks: An Analysis of Decadal GNSS Time Series After the 2011 Tohoku-oki Earthquake
A function model based on nonlinear transient rock rheology was developed to analyze decadal GNSS time series after the 2011 Tohoku-Oki earthquake. This model captures the evolving postseismic signal over more than a decade, demonstrating that rock transient rheology controls the time-dependent postseismic deformation.
2019 — Science Advances
Coupled afterslip and transient mantle flow after the 2011 Tohoku earthquake
We explored the role of afterslip and viscoelastic relaxation and their mechanical interaction after the 2011 Mw 9.0 Tohoku earthquake using laterally varying, experimentally constrained rock rheology. Mechanical coupling between viscoelastic relaxation and afterslip notably modifies both the afterslip distribution and surface deformation, highlighting its importance for long-term postseismic studies across the seismic cycle.
2016 — Geophys. Res. Lett.
Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku-Oki earthquake
Using 2-D finite element modeling with heterogeneous rheology including weak zones beneath volcanoes, we reproduced small-scale (<20 km) perturbations in postseismic deformation such as local subsidence around Quaternary volcanoes. The combination of afterslip and viscoelastic relaxation in this heterogeneous model explains observations well, even on small scales.
2013 — Geophys. Res. Lett.
Two-dimensional viscosity structure of the northeastern Japan island arc-trench system
Two-dimensional viscosity profiles were constructed for the NE Japan arc-trench system covering the 2011 Tohoku-Oki earthquake source area. Using seismological models, rock flow laws, and geothermal data, steady-state effective viscosity was predicted, revealing strong lateral viscosity gradients both parallel and normal to the trench axis.