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Jun Muto

Section

Graduate School of Science

Job title

Professor

Degree

researchmap

https://researchmap.jp/junmuto

J-GLOBAL ID

200901049434856601

e-Rad No.

40545787

ORCID

https://orcid.org/0000-0001-8493-4051

Profile

Jun Muto holds a diploma degree in Geology from Tohoku University. He finished his PhD under the supervision of Prof. Hiroyuki Nagahama at Tohoku University in 2006. Thereafter, he worked as a post-doctoral researcher supported by the JSPS Overseas Research Fellowship in the Department of Geological Sciences, Brown University (USA) under the supervision of Prof. Jan Tullis. In April 2008 he moved back to Tohoku University as an assistant professor. Since 2022, he has been a professor at Tohoku University. He has studied the rheology of crust and mantle rocks through laboratory experiments on rock deformation and numerical modelling. His present research is focused on the post-seismic deformation of the 2011 Tohoku-Oki earthquake and the effect of water on the rheological behaviour of lower crustal rocks.

Research History 15

2022/06 - Present

Tohoku University　Department of Earth Science, Graduate School of Science　Professor
2021/04 - Present

東北大学災害科学国際研究所災害評価・低減研究部門陸域地震学・火山学研究分野 (兼務教員)
2016/04 - 2022/05

Tohoku University　Department of Earth Science, Graduate School of Science　Associate Professor
2016/10 - 2021/03

東北大学災害科学国際研究所災害理学研究部門 (兼務教員)
2019/09 - 2019/11

パリ高等師範学校（ENS PARIS）招聘教授
2018/12 - 2018/12

Shizuoka University
2017/09 - 2017/09

Hokkaido University
2015/04 - 2016/03

Tohoku University　Institute of Higher Education　Assistant Professor
2013/10 - 2015/03

Tohoku University　Department of Earth Science, Graduate School of Science　Assistant Professor
2014/07 - 2014/07

Osaka City University
2013/04 - 2013/09

Tohoku University　Frontier Research Instiute　Assistant Professor
2008/04 - 2013/03

Tohoku University　GCOE　Assistant Professor
2006/06 - 2008/03

JSPS Overseas Research Fellowship
2006/04 - 2006/06

Toyota Institute of Technology　Frontier Material Science　Research Associate
2004/04 - 2006/03

JSPS　Research Fellowship for Young Scientists (DC2)

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Education 3

Tohoku University　Graduate School of Sciences　Department of Earth Science (Dr. of Science)

2003/04 - 2006/03
Tohoku University　Graduate School of Sciences　Department of Earth Science (Msc)

2001/04 - 2003/03
Tohoku University　Faculty of Sciences　Geoenvironmental Sciences

1997/04 - 2001/03

Committee Memberships 5

日本地質学会　評議員

2014/04 - Present
日本地質学会　評議員

2014/04 - Present
申川鉱山タイトオイル環境対策評価検討会オブザーバー

2014/04 - 2017/03
日本地質学会　評議員

2012/04 - 2014/03
日本地質学会　評議員

2012/04 - 2014/03

Professional Memberships 4

American Geophysical Union
Japan Geoscience Union
Seismological Society of Japan
Geological Society of Japan

Research Interests 4

Post-seismic deformation
Rheology of rocks and minerals
岩石力学
構造地質学、岩石力学

Research Areas 1

Natural sciences / Solid earth science / Structural Geology, Rheology of rocks

Awards 6

EMSEV award during EGU 2021

2021/05　Electromagnetic Studies of Earthquakes and Volcanoes
Best Paper Award

2016/11　Second International Conference on Science, Engineering & Environment (SEE-Osaka 2016), Osaka, Japan, November, 2016.　Concept of plasticity index to influence mechanical bifurcation of soils and soft-sediment deformation
Prof. Tsanyao Frank Yang Young Scientist Award

2016/10　nternational Geo-Hazard Research Symposium, Taipei, Taiwan　Anomalous atmospheric radon concentration related to earthquakes: Anomaly detection by singular spectrum transformation
日本地質学会研究奨励賞

2014/09/13　日本地質学会　日本地質学会研究奨励賞「東日本太平洋沖地震後の余効変動解析へ向けた東北日本弧レオロジー断面」
President Awards for Students of Tohoku University

2006/03
Best Presentation Awards in Annual Meeting of Geological Society of Japan

2005/08　Geological Society of Japan

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Papers 132

Reaction-induced fracturing and rheological effects of carbonation at the slab–mantle interface: Constraints from hydrostatic and shear experiments

Shunya Okino, Atsushi Okamoto, Ryosuke Oyanagi, Yukiko Kita, Sando Sawa, Jun Muto

2026/03/14

DOI： 10.5194/egusphere-egu26-15694 　
Rheological Properties of the Crust and Upper Mantle in Northeast Japan Following Postseismic Deformation from the 2011 Tohoku-oki Earthquake

Jun MUTO, Sambuddha DHAR

Journal of Geography (Chigaku Zasshi)　2026/02/25

DOI： 10.5026/jgeography.135.61 　
Reactions, element transfer, and fracturing at ultramafic rock–sediment contacts: insights from reaction experiments at 500 °C and 1 GPa

Shunya Okino, Atsushi Okamoto, Ryosuke Oyanagi, Yukiko Kita, Sando Sawa, Jun Muto

Contributions to Mineralogy and Petrology　2026/02

DOI： 10.1007/s00410-025-02283-9 　
Induced Earthquakes Inhibited by Shear Thickening Fluid

Lu Wang, Yusuke Mukuhira, Yasuo Yabe, Sando Sawa, Jun Muto

Geophysical Research Letters　2025/12/28

DOI： 10.1029/2025GL118281 　
Ballistic limits and failure patterns of TiAl alloy plates in particle impact

Yu Kurashige, Kosei Ogita, Jun Muto, Hiroyuki Nagahama, Hiroki Saito, Yuji Ichikawa, Kazuhiro Ogawa, Yutaro Ota, Keiji Kubushiro

Materials & Design　2025/12

DOI： 10.1016/j.matdes.2025.115115 　
The Brittle‐Plastic Transition in Quartz‐Albite Mixtures: New Insights From Shear Deformation Experiments at Mid‐to‐Lower Crustal Depth Conditions

Miho Furukawa, Berend A. Verberne, Sando Sawa, Hiroyuki Nagahama, Miki Takahashi, Oliver Plümper, Jun Muto

Journal of Geophysical Research: Solid Earth　2025/11

DOI： 10.1029/2025JB031249 　
Kink strengthening and rank-1 connection of crustal rocks

Hiroaki Yokoyama, Tomu Ofune, Eranga Jayawickrama, Mitsuhiro Hirano, Sando Sawa, Jun Muto, Hiroyuki Nagahama

Scientific Reports　15　(1)　2025/09/26
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-025-17812-6 　

eISSN： 2045-2322

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Abstract Kink bands are localized folds or bends formed in layered materials, such as millefeuille. They are common in rocks within the earth’s crust that have undergone compression deformation. While the formation of kinks has been studied extensively, their effects on material strength remain unclear in geologic materials. This study investigates the relationship between kink formation and compressive strength through experiments on crustal-material biotite. In our results, kink bands are observed pervasively in samples and show hardening behavior. The observed kinks have symmetric tilt boundaries, satisfying the rank-1 connection condition, a key condition for material strengthening. Therefore, the hardening behavior observed in this study is due to “kink strengthening”. Furthermore, we reviewed whether kink bands of various scales in geologic materials satisfy the rank-1 connection and discussed its effect on the strength. Notably, it is indicated that the formation of mega kinks (km-scale kinks) strengthens the crust and influences earthquake rupture.
Magnitude Distribution During Transformational Faulting: Implication for Deep‐Focus Earthquakes

S. Sawa, J. Gasc, N. Miyajima, A. Schubnel, M. Baïsset, J. Muto

Journal of Geophysical Research: Solid Earth　2025/08

DOI： 10.1029/2025JB031779 　
Time Evolution of Dehydration‐Induced Stick‐Slip Behaviors of Simulated Bassanite Gouges

M. Kawabata, R. Shiraishi, J. Muto, H. Nagahama, Y. Sasaki, M. Iwasaki

Geophysical Research Letters　2025/05/16

DOI： 10.1029/2025GL115114 　
Inferring 3‐D Rheology of Low‐Viscosity Zone Around Quaternary Volcanoes of NE Japan From Postseismic Deformation of the 2011 Tohoku‐Oki Earthquake

Sambuddha Dhar, Youichiro Takada, Jun Muto

Journal of Geophysical Research: Solid Earth　2025/04

DOI： 10.1029/2024JB029939 　
Practical cut-off value for radon concentration in indoor air using an activated-charcoal radon collector Peer-reviewed

Yumi Yasuoka, June Takemoto, Yasutaka Omori, Nanaho Kawamoto, Nao Goda, Hiroyuki Nagahama, Jun Muto, Shinji Tokonami, Masahiro Hosoda, Takeshi Iimoto, Takahiro Mukai

Radiation Protection Dosimetry　200　(16-18)　1701-1705　2024/11/13
Publisher: Oxford University Press (OUP)
DOI： 10.1093/rpd/ncae108 　

ISSN： 0144-8420

eISSN： 1742-3406

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Abstract The World Health Organization (WHO) recommends that countries adopt the reference level of 100 Bq m−3 for indoor radon gas. Adopting the reference level requires a preliminary assessment of the indoor radon concentration. In the preliminary investigation, a cut-off value is useful, which is a value for selecting samples that can be reliably determined to be below the reference level (in this paper, the WHO reference level) using a straightforward method. If the true value was the WHO reference level, then the cut-off value of the PicoRad collector for selecting samples was determined as 80 Bq m−3 through the analysis of the 95% prediction interval.
Exploring the Eastern Abukuma Mountains: A field guide to high-pressure metamorphic rocks and strike-slip crustal shear zones in the Southern Kitakami Belt, NE Japan

Tatsuki Tsujimori, Jun Muto, Hiroaki Yokoyama, Kohei Shiseki

The Journal of the Geological Society of Japan　2024/08/30

DOI： 10.5575/geosoc.2024.0022 　
Rubinite, Ca3Ti3+2Si3O12, a new mineral in CV3 carbonaceous chondrites and a refractory garnet from the solar nebula

Chi Ma, Takashi Yoshizaki, Alexander N. Krot, John R. Beckett, Tomoki Nakamura, Kazuhide Nagashima, Jun Muto, Marina A. Ivanova, Alexander A. Ulyanov

American Mineralogist　2024/06/27

DOI： 10.2138/am-2024-9435 　

ISSN： 0003-004X 1945-3027

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<jats:title>Abstract</jats:title> <jats:p>Rubinite (IMA 2016-110) is a recently discovered Ti3+-dominant refractory mineral in the garnet group from the solar nebula. It has the Ia3d garnet-type structure with a = 12.19(1) Å, and Z = 8, and end-member formula of Ca3Ti3+2Si3O12. Rubinite was identified as micrometer-sized crystals in five refractory Ca,Al-rich inclusions (CAIs) from the CV3 carbonaceous chondrites Allende, Efremovka, and Vigarano. In the Vigarano CAI V3, it occurs in the central portion of an ultrarefractory fragment with Zr,Y,Sc-oxide, spinel and davisite-diopside, all enclosed within an amoeboid olivine aggregate. In the Allende Compact Type A (CTA) CAI AE01-01, it occurs with gehlenitic melilite, perovskite, spinel, hibonite, davisite, grossmanite, and diopside. In Efremovka, rubinite occurs within gehlenitic melilite with perovskite, spinel, and grossmanite in three CTA CAIs E101, E105, and 40E-1 (in a compound CAI). Rubinite is present in spinel-poor regions in all four of the Efremovka and Allende CAIs but it is in contact with spinel in the Vigarano inclusion.</jats:p> <jats:p>The mean chemical composition of type rubinite in Allende is (in wt%) CaO 32.68, Ti2O3 14.79, TiO2 13.06, SiO2 28.37 Al2O3 3.82, Sc2O3 1.80, Na2O 1.01, ZrO2, 0.80, MgO 0.79, V2O3 0.61, FeO 0.53, Y2O3 0.07, Cr2O3 0.05, total 98.38, giving rise to an empirical formula of (Ca2.94Na0.08)(Ti3+1.04Ti4+0.59Sc0.13Mg0.10V0.04Fe0.04Zr0.03)(Si2.38Al0.38Ti4+0.24)O12, where Ti3+ and Ti4+ are partitioned based on stoichiometry. Efremovka rubinite has a similar composition with a mean empirical formula of (Ca2.97Na0.06)(Ti3+1.05Ti4+0.66Mg0.12Sc0.09Zr0.03V0.03Y0.01Fe0.01)(Si2.36Al0.48Ti4+0.16)O12. Vigarano rubinite is much more Y-, Sc-, and Zr-rich, having an empirical formula of (Ca1.89Y0.83Mg0.28)(Ti3+0.59Sc0.50Zr0.72Mg0.2V0.02Cr0.01)(Si1.64Al1.18Ti4+0.07Fe0.06)O12. All rubinites are Ti3+-rich but a significant amount (11–46%) of the Ti is 4+.</jats:p> <jats:p>In the Efremovka CTAs, spinel is 16O-rich (Δ17O ~ –24‰); rubinite and perovskite show limited ranges of Δ17O (from –24 to –16‰; most analyses range from –24 to –20‰); melilite and grossmanite are the most 16O-depleted minerals (Δ17O range from ~ –10 to –4‰ and from –8 to –5‰, respectively). In the Allende CTA AE01-01, spinel and hibonite are 16O-rich (Δ17O ~ –24‰); melilite, rubinite and perovskite show large ranges in Δ17O (from –23 to –3‰, from –21 to –6‰, and from –14 to – 2‰, respectively); grossmanite is uniformly 16O-depleted (Δ17O ~ –3‰).</jats:p> <jats:p>Rubinite formed under highly reducing conditions in the solar nebula by gas-solid condensation and by crystallization from a Ca, Al, and Ti-rich melt. Subsequently, most rubinite grains in the Allende CAI and some in the Efremovka CAIs may have experienced O-isotope exchange to a various degree with an 16O-depleted (Δ17O ~ – 2‰) aqueous fluid on the CV chondrite parent asteroid. However, crystallization from a Ca,Al,Ti-rich melt that recorded O-isotope exchange: with nebular gas with variable Δ17O or post-crystallization O-isotope with such gas cannot be excluded. The mineral name is in honor of Alan E. Rubin (b. 1953), a cosmochemist at University of California, Los Angeles (UCLA), USA, for his many contributions to research in cosmochemistry and mineralogy of meteorites.</jats:p>
Detection of atmospheric radon concentration anomalies and their potential for earthquake prediction using Random Forest analysis

Mayu Tsuchiya, Hiroyuki Nagahama, Jun Muto, Mitsuhiro Hirano, Yumi Yasuoka

Scientific Reports　14　(1)　2024/05/31
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-024-61887-6 　

eISSN： 2045-2322

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Abstract Various anomalies occurring before earthquakes are currently being studied to predict seismic events, with one of them being the radioactive element radon (²²²Rn). Radon concentrations in the soil, water, and atmosphere fluctuate in response to crustal movement. Recent research has statistically detected anomalies by analyzing the fluctuations in radon concentrations before earthquakes and conducting quantitative evaluations of radon. However, the method used to determine the parameters in the analysis was problematic. Therefore, in this study, we compared observed atmospheric radon concentration data with predicted values based on typical annual patterns using Random Forest analysis. We conducted a more objective analysis by employing this method and statistically determining anomalies using thresholds. This analysis was conducted using atmospheric radon concentration observation data obtained at Kobe Pharmaceutical University (KPU) before the 1995 Kobe Earthquake, and ionization currents emitted when radon decays were obtained at Fukushima Medical University (FMU) before the 2011 Tohoku-oki Earthquake. Consequently, before the major earthquakes occurred at both locations, the difference between the predicted and observed values exceeded the standard deviation by a factor of three. These results indicate the potential of Random Forest analysis to identify anomalies in atmospheric radon concentrations before earthquakes occur.
Transient Creep of Quartz and Granulite at High Temperature Under Wet Conditions

Sagar Masuti, Jun Muto, Erik Rybacki

Journal of Geophysical Research: Solid Earth　2023/10

DOI： 10.1029/2023JB027762 　
A split Hopkinson pressure bar for experimental investigation of dynamic pulverization under very high strain rates

Eranga Gayanath Jayawickrama, Takuma Sekiguchi, Jun Muto, Sando Sawa, Hiroyuki Nagahama, Yoshio Kono, Kyung-Oh Bae, Hyung-Seop Shin

Review of Scientific Instruments　94　(9)　2023/09/01
Publisher: AIP Publishing
DOI： 10.1063/5.0151448 　

ISSN： 0034-6748

eISSN： 1089-7623

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Off-fault damage or pulverized rocks found in large-scale strike–slip faults are of great interest in earthquake research. In order to experimentally investigate rock pulverization, we developed a split Hopkinson pressure bar with compact dimensions and high-speed imaging. The developed experimental setup is capable of generating very high strain rates up to 1320 s−1 with the satisfaction of stress equilibrium, which are essential to reproduce the dynamic pulverization observed in nature and obtain dynamic stress–strain responses accurately. High-speed imaging revealed that cracks initiate and propagate along the grain boundaries at very high speeds, while the dynamic stress–strain response suggested that energy dissipated into the fracture increases with stronger impacts. In addition, we show that the apparatus is capable of producing particle size distributions partly similar to those in naturally pulverized rocks of large-scale strike–slip faults. Thus, our developed system with compact dimensions opens new ways to understand the dynamics of the rock pulverization in off-fault regions of large-scale strike–slip faults.
Modeling of olivine-spinel phase transformation of germanate olivine (Mg2GeO4) by using the phase-field method Peer-reviewed

Sando Sawaa, Jun Muto, Hiroyuki Nagahama

Physics of the Earth and Planetary Interiors　Accepted　107060-107060　2023/06
Publisher: Elsevier BV
DOI： 10.1016/j.pepi.2023.107060 　

ISSN： 0031-9201
Function Model Based on Nonlinear Transient Rheology of Rocks: An Analysis of Decadal GNSS Time Series After the 2011 Tohoku‐oki Earthquake

Sambuddha Dhar, Jun Muto

Geophysical Research Letters　50　(9)　2023/05/03
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2023gl103259 　

ISSN： 0094-8276

eISSN： 1944-8007
Heterogeneous rheology of Japan subduction zone revealed by postseismic deformation of the 2011 Tohoku-oki earthquake Peer-reviewed

Sambuddha Dhar, Jun Muto, Yusaku Ohta, Takeshi Iinuma

Progress in Earth and Planetary Science　10　(9)　2023/03
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-023-00539-1 　

eISSN： 2197-4284

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Abstract The 2011 Tohoku-oki earthquake produced the most well-recorded postseismic deformation of any megathrust earthquake in the world. Over the last decade, researchers have used a dense and widespread geodetic network of more than 1300 Global Navigation Satellite System (GNSS) stations inland, as well as the about 50 stations on the seafloor, to investigate the various deformation sources responsible for the observed crustal deformation. One of the contributing mechanisms to this crustal deformation is the stress relaxation of the viscoelastic mantle beneath the Japanese arc. As evident in experimental rock physics and geophysical observations, ambient mantle conditions and related rheology are expected to be heterogeneous in space. However, the contribution of such rheological heterogeneities to the postseismic deformation is still poorly understood. Here, we piece together several rheological heterogeneities inferred from the decade-long postseismic deformation of the 2011 Tohoku-oki earthquake. We reviewed more than twenty postseismic models to understand how viscoelastic earth can influence the postseismic surface deformation observed after the Tohoku-oki earthquake. Besides, we employed several synthetic models to tease out the contribution of individual rheological heterogeneities such as depth-dependent rheology of mantle wedge, oceanic asthenosphere, and low-viscosity zone beneath the volcanic front. We demonstrate that the vertical postseismic observation is the key to unravel rheological complexity beneath northeastern Japan. The broader vertical deformation pattern reveals the major viscosity contrast between backarc and forearc, and small-scale subsidence detects the presence of low-viscosity bodies related to arc magmatism. In short, this review paper provides a vista of three-dimensional heterogeneous rheology of viscoelastic earth. These rheological heterogeneities may play a crucial role in bridging the gap between our understanding of different phase of subduction zone earthquake cycle.
Dehydration of brucite + antigorite under mantle wedge conditions: insights from the direct comparison of microstructures before and after experiments

Takayoshi Nagaya, Atsushi Okamoto, Masanori Kido, Jun Muto, Simon R. Wallis

Contributions to Mineralogy and Petrology　2022/09

DOI： 10.1007/s00410-022-01956-z 　
The quantitative characterization of hydraulic fracture connectivity from a postmortem investigation

Eranga G Jayawickrama, Jun Muto, Osamu Sasaki, Hiroyuki Nagahama

Journal of Geophysics and Engineering　19　(2)　211-226　2022/04/05
Publisher: Oxford University Press (OUP)
DOI： 10.1093/jge/gxac012 　

ISSN： 1742-2132

eISSN： 1742-2140

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Abstract Two bio-siliceous Onnagawa (ONG I and ONG II) shale samples have been hydraulically fractured under two constant differential stresses (60 and 85 MPa, respectively) to investigate the fracture network's connectivity evolution by a postmortem analysis. The pressure inside the drilled borehole in a cylindrical core sample is increased above the confining pressure (10 MPa) until failure by hydraulic fracture. The two samples failed at two different borehole pressures (ONG I: 42 MPa, ONG II: 16 MPa). Fractured samples were scanned in an industrial X-ray CT machine and the tomographic images of the fracture network were extracted for a postmortem investigation. From the fracture volume segments, obtained by thresholding the frequency distribution of the fracture network's voxel values, a quantitative estimation of fracture connectivity was carried out. The connectivity was quantified based on the relative entropy of size distribution of fractures (${H_r}$), a method adapted from information theory. Fracture connectivity estimation shows that ${H_r}$ is at a maximum value when the fractures show a significant distribution with very limited connectivity. The value of ${H_r}$ is at a minimum and close to 0 when a well-linked fracture network is formed. In both samples, this minimum was attained at the threshold of 43k indicating the highest connectivity and the best representation of the fracture network. The extracted fracture network of ONG I showed a multi-winged hydraulic fracture network while a planar conventional two-winged hydraulic fracture network had been generated in ONG II with a lower fracture volume.
Transient rheology of the continental crust

Sagar Masuti, Jun Muto, Erik Rybacki

2022/03/27
Publisher: Copernicus {GmbH}
DOI： 10.5194/egusphere-egu22-4536 　
Along-arc heterogeneous rheology inferred from post-seismic deformation of the 2011 Tohoku-oki earthquake

Sambuddha Dhar, Jun Muto, Yoshiaki Ito, Satoshi Miura, James D P Moore, Yusaku Ohta, Takeshi Iinuma

Geophysical Journal International　230　(1)　202-215　2022/03/24
Publisher: Oxford University Press (OUP)
DOI： 10.1093/gji/ggac063 　

ISSN： 0956-540X

eISSN： 1365-246X

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SUMMARY The Japan forearc plays a crucial role in modulating the post-seismic deformation in response to the enormous stress perturbation induced by the 2011 Tohoku-oki earthquake. Dense geodetic observations across Japan have revealed coupled interactions between afterslip on the subducting plate interface and viscous deformation within the mantle wedge, and detailed numerical models can provide further profound insights into the forearc rheology. Recent studies have revealed the presence of a stagnant section in the forearc mantle of the Tohoku subduction zone, and here we investigate the associated along-arc variation of the stagnant part of the mantle wedge (cold nose) across Japan. We utilize a newly deployed geodetic network along a corridor in the Fukushima–Niigata region and compare the surface deformation pattern to that of the Miyagi–Yamagata corridor close to the main rupture area. We present a 3-D rheological model using laboratory-derived constitutive laws to simulate the geodetic observations including displacement fields and their time-series. Our results suggest along-arc heterogeneity in the forearc mantle rheology; specifically, we find a narrower cold nose in the Miyagi region and a wider one in the Fukushima forearc. The geodetic inferences on the forearc variation are consistent with along-arc spatial heterogeneity in the cut-off depth for shallow earthquakes as well as comparative measurements of the respective geothermal gradients between the Miyagi and Fukushima regions.
Enhancement of ductile deformation in polycrystalline anorthite due to the addition of water

Junichi Fukuda, Jun Muto, Sanae Koizumi, Sando Sawa, Hiroyuki Nagahama

Journal of Structural Geology　156　2022/03

DOI： 10.1016/j.jsg.2022.104547 　

ISSN： 0191-8141
Localized Deformation of Lawsonite During Cold Subduction

R. Shiraishi, J. Muto, A. Tsunoda, S. Sawa, A. Suzuki

Journal of Geophysical Research: Solid Earth　127　(2)　2022/02

DOI： 10.1029/2021JB022134 　

ISSN： 2169-9313

eISSN： 2169-9356
Estimation of surface charge densities supporting seismo-electromagnetic phenomena through the surface charging mechanism

Kiriha Tanaka, Hiroyuki Nagahama, Jun Muto, Toshitaka Oka, Yasuo Yabe

Physics and Chemistry of the Earth　2022

DOI： 10.1016/j.pce.2022.103137 　

ISSN： 1474-7065
地震断層の動的すべり挙動の解明に向けた放射光・高速摩擦実験

廣瀬丈洋, 武藤潤

月刊地球　44　25-29　2022/01
Preseismic atmospheric radon anomaly associated with 2018 Northern Osaka earthquake Peer-reviewed

Jun Muto, Yumi Yasuoka, Nao Miura, Daichi Iwata, Hiroyuki Nagahama, Mitsuhiro Hirano, Yoshiro Ohmomo, Takahiro Mukai

Scientific Reports　11　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-86777-z 　

eISSN： 2045-2322
Radon degassing triggered by tidal loading before an earthquake Peer-reviewed

Yasutaka Omori, Hiroyuki Nagahama, Yumi Yasuoka, Jun Muto

Scientific Reports　11　(1)　2021/12

DOI： 10.1038/s41598-021-83499-0 　

eISSN： 2045-2322
Strain-induced partial serpentinization of germanate olivine with a small amount of water

Sando Sawa, Nobuyoshi Miyajima, Jun Muto, Hiroyuki Nagahama

American Mineralogist　106　(11)　1789-1796　2021/11/25

DOI： 10.2138/am-2021-7735 　

ISSN： 0003-004X

eISSN： 1945-3027
Damage Evolution of Onnagawa Shale by Postmortem Thresholding of X-Ray Computed Tomography

E. G. Jayawickrama, J. Muto, O. Sasaki, H. Nagahama

Journal of Geophysical Research: Solid Earth　126　(11)　2021/11

DOI： 10.1029/2021JB022056 　

ISSN： 2169-9313

eISSN： 2169-9356
Short‐wavelength Bouguer gravity anomaly and active fault distribution in the northeastern Japan arc

Mitsuhiro Hirano, Hiroyuki Nagahama, Jun Muto

Terra Nova　34　(1)　47-53　2021/09/17
Publisher: Wiley
DOI： 10.1111/ter.12560 　

ISSN： 0954-4879

eISSN： 1365-3121
Strain localization bands in fine-grained aggregates of germanate olivine and pyroxene deformed by a Griggs type apparatus Peer-reviewed

Sando Sawa, Jun Muto, Nobuyoshi Miyajima, Rei Shiraishi, Masanori Kido, Hiroyuki Nagahama

International Journal of Rock Mechanics and Mining Sciences　144　104812-104812　2021/08
Publisher: Elsevier BV
DOI： 10.1016/j.ijrmms.2021.104812 　

ISSN： 1365-1609
Rectifying characteristics of semiconductor minerals: A model on seismo-electromagnetic radiation mechanism from ore bodies

Naoto Kaneko, Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

Physics of the Earth and Planetary Interiors　315　2021/06

DOI： 10.1016/j.pepi.2021.106694 　

ISSN： 0031-9201
電子スピン共鳴(ESR)法を用いた断層年代推定法 Invited Peer-reviewed

田中桐葉, 武藤潤, 長濱裕幸, 岡壽崇

放射線化学〈特集記事: ESR 法を用いた放射線科学の最近の進歩〈後編〉〉　110　21-31　2020/11
Slow Stick-Slip Failure in Halite Gouge Caused by Brittle-Plastic Fault Heterogeneity Peer-reviewed

Ken ichi Hirauchi, Yoshiaki Yoshida, Yasuo Yabe, Jun Muto

Geochemistry, Geophysics, Geosystems　21　(9)　2020/09/01
Publisher: American Geophysical Union (AGU)
DOI： 10.1029/2020GC009165 　

ISSN： 1525-2027

eISSN： 1525-2027
Crystallographic preferred orientation of talc determined by an improved EBSD procedure for sheet silicates: Implications for anisotropy at the slab-mantle interface due to Si-metasomatism Peer-reviewed

Takayoshi Nagaya, Atsushi Okamoto, Ryosuke Oyanagi, Yusuke Seto, Akira Miyake, Masaoki Uno, Jun Muto, Simon R. Wallis

American Mineralogist　105　(6)　873-893　2020/06/25

DOI： 10.2138/am-2020-7006 　

ISSN： 0003-004X

eISSN： 1945-3027
Effect of fracture on ESR intensity using a low-velocity rotary shear apparatus Peer-reviewed

Kiriha Tanaka, Jun Muto, Yasuo Yabe, Toshitaka Oka, Hiroyuki Nagahama

Geochronometria (in press)　48　(1)　2020/04

DOI： 10.2478/geochr-2020-0035 　

ISSN： 1733-8387

eISSN： 1897-1695
Flow of Lower Crust and Upper Mantle Inferred from Geological and Geophysical Observations

Jun MUTO, Masanori KIDO

Journal of Geography (Chigaku Zasshi)　2019/10/25

DOI： 10.5026/jgeography.128.731 　
Evaluation of a radon air monitor in the measurement of radon concentration in water in comparison with a liquid scintillation counter Peer-reviewed

Shoko Higuchi, Yuuki Kamishiro, Maki Ishihara, Yumi Yasuoka, Yasunori Mori, Masahiro Hosoda, Kazuki Iwaoka, Shinji Tokonami, Rikiya Takahashi, Miroslaw Janik, Jun Muto, Hiroyuki Nagahama, Takahiro Mukai

Radiation Protection Dosimetry　184　(3-4)　426-429　2019/10/01
Publisher: Oxford University Press (OUP)
DOI： 10.1093/rpd/ncz070 　

ISSN： 0144-8420

eISSN： 1742-3406
Coupled afterslip and transient mantle flow after the 2011 Tohoku earthquake Peer-reviewed

J. Muto, J. D.P. Moore, S. Barbot, T. Iinuma, Y. Ohta, H. Iwamori

Science Advances　5　(9)　eaaw1164　2019/09/25

DOI： 10.1126/sciadv.aaw1164 　

eISSN： 2375-2548
地質学的観察および測地学的観測から知る下部地殻・上部マントルの流動 Peer-reviewed

武藤潤, 木戸正紀

地学雑誌　2019/09

DOI： 10.5026/jgeography.128.000 　
Pressure dependence of elastic deformation at multiple contacts and estimation of contact state of thin cracks Peer-reviewed

Eranga Gayanath Jayawickrama, Hayata Tamai, Jun Muto, Hiroyuki Nagahama

Geophysics　84　(4)　WA153-WA160　2019/07

DOI： 10.1190/GEO2018-0501.1 　

ISSN： 0016-8033

eISSN： 1942-2156
Normal stress dependency of ESR characteristic in quartz gouge by fault frictional sliding at shallow depth

Tanaka Kiriha, Muto Jun, Yabe Yasuo, Oka Toshitaka, Nagahama Hiroyuki

Annual Meeting of the Geological Society of Japan　2019　503　2019
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2019.0_503 　

ISSN： 1348-3935

eISSN： 2187-6665
Development of Quartz Ribbons in Felsic Granulites Under Strong Coaxial Deformation in the Highland Complex of Sri Lanka Peer-reviewed

Athurupana, B., Muto, J., Nagahama, H.

Advances in Science, Technology and Innovation　2019/01
Publisher: Advances in Science, Technology and Innovation
DOI： 10.1007/978-3-030-01455-1_8 　

ISSN： 2522-8722 2522-8714
Strain localization and fabric development in polycrystalline anorthite + melt by water diffusion in an axial deformation experiment Peer-reviewed

Jun ichi Fukuda, Jun Muto, Hiroyuki Nagahama

Earth, Planets and Space　70　(1)　2018/12/01
Publisher: Springer Berlin Heidelberg
DOI： 10.1186/s40623-017-0776-2 　

ISSN： 1343-8832

eISSN： 1880-5981
Non-parametric detection of atmospheric radon concentration anomalies related to earthquakes Peer-reviewed

Daichi Iwata, Hiroyuki Nagahama, Jun Muto, Yumi Yasuoka

Scientific Reports　8　(1)　13028　2018/12/01

DOI： 10.1038/s41598-018-31341-5 　

eISSN： 2045-2322
N-myristoylation and S-acylation are common modifications of Ca²⁺-regulated Arabidopsis kinases and are required for activation of the SLAC1 anion channel

Saito, S., Hamamoto, S., Moriya, K., Matsuura, A., Sato, Y., Muto, J., Noguchi, H., Yamauchi, S., Tozawa, Y., Ueda, M., Hashimoto, K., K{\"o}ster, P., Dong, Q., Held, K., Kudla, J., Utsumi, T., Uozumi, N.

New Phytologist　218　(4)　2018

DOI： 10.1111/nph.15053 　

ISSN： 1469-8137 0028-646X
Origin and cosmochemical implications of rubinite (Ca3Ti3+2Si3O12), a new CAI mineral from the Allende CV chondrite Peer-reviewed

Yoshizaki Takashi, Nakamura Tomoki, Muto Jun

Abstracts of Annual Meeting of the Geochemical Society of Japan　65　(0)　187-187　2018
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.65.0_187 　

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<p>New minerals from chondritic refractory inclusions potentially record a specific history of the earliest stage of the solar system evolution. Rubinite (Ca₃Ti³⁺₂Si₃O₁₂) is a new garnet mineral identified in refractory inclusions from CV carbonaceous chondrites. Petrology and mineral chemistry of rubinite from the Allende CV chondrite suggest formation from a partial melt of a pre-existing nebula condensate under highly reduced conditions near the proto-Sun. Since mineralogical and petrological variations observed in Allende rubinite might reflect physicochemical conditions of both nebular and asteroidal processes, further investigation of the mineral will provide us new insights into the early solar system processes.</p>
The anomaly in atmospheric radon concentrations prior to the 2011 Tohoku-oki Earthquake in Japan. Peer-reviewed

Yumi Yasuoka, Hiroyuki Nagahama, Jun Muto, Takahiro Mukai

Radiation Environment and Medicine　7　86-94　2018/01
Accurate measurement of indoor radon concentration using a low-effective volume radon monitor Peer-reviewed

Aya Tanaka, Nodoka Minami, Yumi Yasuoka, Takeshi Iimoto, Yasutaka Omori, Hiroyuki Nagahama, Jun Muto, Takahiro Mukai

Radiation Protection Dosimetry　177　(3)　324-330　2017/12/01

DOI： 10.1093/rpd/ncx050 　

ISSN： 0144-8420

eISSN： 1742-3406
Performance test of a portable indoor radon concentration monitor for the measurement of radon concentration in water in comparison with the liquid scintillation counter

神代悠希, 石原万己, 藤井さとみ, 安岡由美, 細田正洋, 岩岡和輝, 床次眞司, JANIK Miroslaw, 武藤潤, 長濱裕幸, 向高弘

KEK Proceedings (Web)　(2017-6)　333‐338 (WEB ONLY)　2017/11
活性炭型ラドン検出器による屋内ラドン濃度測定の検討 Peer-reviewed

藤井さとみ, 新井友里愛, 安岡由美, 飯本武志, 床次眞司, Miroslaw Janik, 長濱裕幸, 武藤潤, 向高弘

第67回日本薬学会近畿支部大会　2017/10/14
Reaction-induced grain boundary cracking and anisotropic fluid flow during prograde devolatilization reactions within subduction zones Peer-reviewed

Atsushi Okamoto, Hiroyuki Shimizu, Jun ichi Fukuda, Jun Muto, Takamoto Okudaira

Contributions to Mineralogy and Petrology　172　(9)　75　2017/09/01

DOI： 10.1007/s00410-017-1393-6 　

ISSN： 0010-7999
Plasticity index effects on mechanical Bifurcation: Soils and soft-sediment deformation Peer-reviewed

Naoto Kaneko, Jun Muto, Hiroyuki Nagahama

International Journal of GEOMATE　13　(36)　19-25　2017/08/01
Publisher: GEOMATE International Society
DOI： 10.21660/2017.36.2755 　

ISSN： 2186-2982
Small-scale rheological heterogeneity controlled postseismic deformation of the 2011 Tohoku-oki earthquake

Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai

ICF 2017 - 14th International Conference on Fracture　1　421-422　2017
Rheological structure beneath NE Japan inferred fromcoseismic strain anomalies associated with the 2011 Tohoku-oki earthquake (MW9.0) Peer-reviewed

Yasuo Yabe, Jun Muto, Mako Ohzono, Yusaku Ohta, Takeshi Iinuma

International Association of Geodesy Symposia　145　63-71　2017

DOI： 10.1007/1345_2015_135 　

ISSN： 0939-9585
Anomalous changes in atmospheric radon concentration before and after the 2011 northern Wakayama earthquake (Mj 5.5) Peer-reviewed

Mikako Goto, Yumi Yasuoka, Hiroyuki Nagahama, Jun Muto, Yasutaka Omori, Hayato Ihara, Takahiro Mukai

Radiation Protection Dosimetry　174　(3)　376-381　2017

DOI： 10.1093/rpd/ncw142 　

ISSN： 0144-8420

eISSN： 1742-3406
Shear zone development and frictional instability of fault gouge Peer-reviewed

Momoko Hirata, Jun Muto, Hiroyuki Nagahama

International Journal of GEOMATE　12　(34)　32-37　2017
Publisher: GEOMATE International Society
DOI： 10.21660/2017.34.2660 　

ISSN： 2186-2982
CLARIFICATION OF SHEAR ZONE DEVELOPMENT IN A GOUGE LAYER RELATED TO SLIP INSTABILITY Peer-reviewed

Momoko Hirata, Jun Muto, Hiroyuki Nagahama

Proceedings of Second International Conference on Science, Engineering & Environment (SEE-Osaka 2016), Osaka, Japan, November 21st-23rd, 2016　2　108-112　2016/11/22
Concept of plasticity index to influence mechanical bifurcation of soils and soft-sediment deformation Peer-reviewed

Naoto Kaneko, Jun Muto, Hiroyuki Nagahama

Proceedings of Second International Conference on Science, Engineering & Environment (SEE-Osaka 2016), Osaka, Japan, November 21st-23rd, 2016　2　173-179　2016/11
Reaction-induced rheological weakening enables oceanic plate subduction Peer-reviewed

Ken Ichi Hirauchi, Kumi Fukushima, Masanori Kido, Jun Muto, Atsushi Okamoto

Nature Communications　7　1　2016/08/26

DOI： 10.1038/ncomms12550 　

ISSN： 2041-1723

eISSN： 2041-1723
Heterogeneous stress state of island arc crust in northeastern Japan affected by hot mantle fingers Peer-reviewed

Bunichiro Shibazaki, Tomomi Okada, Jun Muto, Takumi Matsumoto, Takeyoshi Yoshida, Keisuke Yoshida

Journal of Geophysical Research: Solid Earth　121　(4)　3099-3117　2016/04

DOI： 10.1002/2015JB012664 　

ISSN： 2169-9313

eISSN： 2169-9356
Method for correction of differential stress calculations from experiments using the solid salt assembly in a Griggs-type deformation apparatus Peer-reviewed

Masanori Kido, Jun Muto, Hiroyuki Nagahama

Tectonophysics　672-673　170-176　2016/03/16

DOI： 10.1016/j.tecto.2016.02.011 　

ISSN： 0040-1951

eISSN： 1879-3266
地震発生先行過程に伴うラドン放出と地殻変形

長濱裕幸, 武藤潤

「地震に先行する大気中ラドン濃度変動に関する観測, 「災害の軽減に貢献するための地震火山観測研究計画の推進について成果」報告書　2016
Heterogeneous rheology controlled postseismic deformation of the 2011 Tohoku-Oki earthquake Peer-reviewed

Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai

Geophysical Research Letters　43　(10)　4971-4978　2016

DOI： 10.1002/2016GL068113 　

ISSN： 0094-8276

eISSN： 1944-8007
The Energetic Assessment of Frictional Instability Based on Rowe's Theory Peer-reviewed

Hirata, M, Muto, J, Nagahama, H

AGU 2015 Fall Meetings　2015/12
Unique large diamonds in a ureilite from Almahata Sitta 2008 TC<inf>3</inf> asteroid Peer-reviewed

Masaaki Miyahara, Eiji Ohtani, Ahmed El Goresy, Yangting Lin, Lu Feng, Jian Chao Zhang, Philippe Gillet, Toshiro Nagase, Jun Muto, Masahiko Nishijima

Geochimica et Cosmochimica Acta　163　14-26　2015/08/05

DOI： 10.1016/j.gca.2015.04.035 　

ISSN： 0016-7037

eISSN： 1872-9533
Fractal particle size distribution of pulverized fault rocks as a function of distance from the fault core Peer-reviewed

Jun Muto, Tsurugi Nakatani, Osamu Nishikawa, Hiroyuki Nagahama

Geophysical Research Letters　42　(10)　3811-3819　2015/05/28

DOI： 10.1002/2015GL064026 　

ISSN： 0094-8276

eISSN： 1944-8007
Calibration for stress measurement of Griggs-type high temperature and high pressure deformation apparatus Peer-reviewed

Kido M, Muto J, Nagahama H

Japan Geoscience Union Meeting　2015/05/27
Effect of stress state on slow rupture propagation in synthetic fault gouges 4. Seismology Peer-reviewed

Ken Ichi Hirauchi, Jun Muto

Earth, Planets and Space　67　(1)　25-なし　2015/02/24

DOI： 10.1186/s40623-015-0199-x 　

ISSN： 1343-8832

eISSN： 1880-5981
Observations of the slow rupture process in synthetic fault gouges. Peer-reviewed

Kenichi Hirauchi, Jun Mut

Earth Planets Space　67　25　2015/02/24

DOI： 10.1186/s40623-015-0199-x 　
Normal seasonal variations for atmospheric radon concentration: A sinusoidal model Peer-reviewed

Koseki Hayashi, Yumi Yasuoka, Hiroyuki Nagahama, Jun Muto, Tetsuo Ishikawa, Yasutaka Omori, Toshiyuki Suzuki, Yoshimi Homma, Takahiro Mukai

Journal of Environmental Radioactivity　139　149-153　2015/01/01

DOI： 10.1016/j.jenvrad.2014.10.007 　

ISSN： 0265-931X

eISSN： 1879-1700
Annual variation in the atmospheric radon concentration in Japan Peer-reviewed

Yuka Kobayashi, Yumi Yasuoka, Yasutaka Omori, Hiroyuki Nagahama, Tetsuya Sanada, Jun Muto, Toshiyuki Suzuki, Yoshimi Homma, Hayato Ihara, Kazuhito Kubota, Takahiro Mukai

Journal of Environmental Radioactivity　146　110-118　2015

DOI： 10.1016/j.jenvrad.2015.04.007 　

ISSN： 0265-931X

eISSN： 1879-1700
Rheological properties of the detachment shear zone of an oceanic core complex inferred by plagioclase flow law: Godzilla Megamullion, Parece Vela back-arc basin, Philippine Sea Peer-reviewed

Katsuyoshi Michibayashi, Yumiko Harigane, Yasuhiko Ohara, Jun Muto, Atsushi Okamoto

Earth and Planetary Science Letters　408　16-23　2014/12/05

DOI： 10.1016/j.epsl.2014.10.005 　

ISSN： 0012-821X

eISSN： 1385-013X
Self-affinities analysis of fault-related folding Peer-reviewed

Kazuhei Kikuchi, Kazutoshi Abiko, Hiroyuki Nagahama, Jun Muto

Episodes　37　(4)　308-311　2014/12/01

DOI： 10.18814/epiiugs/2014/v37i4/011 　

ISSN： 0705-3797
Experimental analysis on Rowe's stress-dilatancy relation and frictional instability of fault gouges Peer-reviewed

Momoko Hirata, Jun Muto, Hiroyuki Nagahama

Episodes　37　(4)　303-307　2014/12/01

DOI： 10.18814/epiiugs/2014/v37i4/010 　

ISSN： 0705-3797
Trench-parallel crustal anisotropy along the trench in the fore-arc region of Japan Peer-reviewed

Takashi Iidaka, Jun Muto, Kazushige Obara, Toshihiro Igarashi, Bunichiro Shibazaki

Geophysical Research Letters　41　(6)　1957-1963　2014/03/28

DOI： 10.1002/2013GL058359 　

ISSN： 0094-8276

eISSN： 1944-8007
Self-affinities of landforms and folds in the Northeast Honshu Arc, Japan Peer-reviewed

Kazuhei Kikuchi, Kazutoshi Abiko, Hiroyuki Nagahama, Hiroshi Kitazato, Jun Muto

Acta Geophysica　61　(6)　1642-1658　2013/12

DOI： 10.2478/s11600-013-0151-z 　

ISSN： 1895-6572

eISSN： 1895-7455
Self-affinities of landforms and folds in the Northeast Honshu Arc, Japan Peer-reviewed

Kazuhei Kikuchi, Kazutoshi Abiko, Hiroyuki Nagahama, Hiroshi Kitazato, Jun Muto

ACTA GEOPHYSICA　61　(6)　1642-1658　2013/12

DOI： 10.2478/s11600-013-0151-z 　

ISSN： 1895-6572

eISSN： 1895-7455
Electromagnetic radiations from semiconductor minerals Peer-reviewed

Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

The 2nd G-EVER International Symposium and the 1st IUGS & SCJ International Workshop on Natural Hazards Sendai, Japan, 19-20 Oct 2013　161-164　2013/10/19
Sinusoidal model for the annual variation of atmospheric radon concentration in Japan Peer-reviewed

Saki Nakamura, Koseki Hayashi, Yumi, Yasuoka, Hiroyuki Nagahama, Jun Muto, Yasutaka Omori, Tetsuo Ishikawa, Toshiyuki Suzuki, Yoshimi Homma, Hayato Ihara, Takahiro Mukai

The 2nd G-EVER International Symposium and the 1st IUGS & SCJ International Workshop on Natural Hazards Sendai, Japan, 19-20 Oct 2013　164-167　2013/10/19
Experimental analysis on Rowe’s stress-dilatancy relation and frictional instability of fault gouges Peer-reviewed

Momoko Hirata, Jun Muto, Hiroyuki Nagahama, Kenshiro Otsuki

Proc. of 2nd G-EVER Symposium　140-143　2013/10/19
Self-affinities Analysis of Fault-related Folding Peer-reviewed

Kazuhei Kikuchi, Kazutoshi Abiko, Hiroyuki Nagahama, Jun Muto

Proc. of 2nd G-EVER Symposium　144-147　2013/10/19
Inhomogeneity of fractal property in rock minerals using 3D X-ray CT measurement Peer-reviewed

Junko Yamaki, Jun Mutoa, Hiroyuki Nagahama, Osamu Sasaki, Harumasa Kano

Proc. of 2nd G-EVER Symposium　152-155　2013/10/19
Electromagnetic radiations from semiconductor minerals Peer-reviewed

Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

Proc. of 2nd G-EVER Symposium　160-163　2013/10/19
Seismic luminous phenomena and VHF electromagnetic emission originated from radon emanation Peer-reviewed

Asuka Seki, Izumi Tohbo, Yasutaka Omori, Jun Muto, Hiroyuki Nagahama

Proc. of 2nd G-EVER Symposium　156-159　2013/10/19
Two-dimensional viscosity structure of the northeastern Japan islands arc-trench system Peer-reviewed

Jun Muto, Bunichiro Shibazaki, Yoshihiro Ito, Takeshi Iinuma, Mako Ohzono, Takumi Matsumoto, Tomomi Okada

Geophysical Research Letters　40　(17)　4604-4608　2013/09/16

DOI： 10.1002/grl.50906 　

ISSN： 0094-8276

eISSN： 1944-8007
Fractal characteristic of fracture in glass or single crystals of quartz by 3D X-ray CT measurement Peer-reviewed

Junko Yamaki, Jun Muto, Hiroyuki Nagahama, Osamu Sasaki, Harumasa Kano

Proceeding of The 6th International Symposium on In-situ Rock Stress　2013/08/01
Rheological structure of the NE Japan island arc-trench system and viscoelastic stress relaxation after the 2011 Tohoku Oki Earthquake Peer-reviewed

Jun Muto, Bunichiro Shibazaki, Yoshihiro Ito, Takeshi Iinuma, Mako Ohzono, Takumi Matsumoto, Tomomi Okada

Proceeding of The 6th International Symposium on In-situ Rock Stress　54　2013/08/01
Two-dimensional viscosity structure of the northeastern Japan islands arc-trench system Peer-reviewed

Jun Muto, Bunichiro Shibazaki, Yoshihiro Ito, Takeshi Iinuma, Mako Ohzono, Takumi Matsumoto, Tomomi Okada

Geophysical Research Letters　40　(17)　4604-4608　2013

DOI： 10.1002/grl.50906 　

ISSN： 0094-8276

eISSN： 1944-8007
Amorphization of quartz by friction: Implication to silica-gel lubrication of fault surfaces Peer-reviewed

Yu Nakamura, Jun Muto, Hiroyuki Nagahama, Ichiko Shimizu, Takashi Miura, Ichiro Arakawa

Geophysical Research Letters　39　(21)　L21303　2012/11/01

DOI： 10.1029/2012GL053228 　

ISSN： 0094-8276

eISSN： 1944-8007
Effect of crustal fluid on plastic deformation of polycrystalline anorthite Peer-reviewed

Jun Muto, Jun-ichi Fukuda, Hiroyuki Nagahama

G-COE symposium 2012; Achievements of G-COE Program for Earth and Planetary Dynamics (G-COE symposium 2012, Sendai City War reconstruction Memorial Hall in Sendai, Japan, September 25-28, 2012)　19-20　2012/09/25
Fabric evolution of single crystals of synthetic quartz sheared at low temperature Peer-reviewed

Hideaki Kaneko, Jun Muto, Hiroyuki Nagahama

G-COE symposium 2012; Achievements of G-COE Program for Earth and Planetary Dynamics (G-COE symposium 2012, Sendai City War reconstruction Memorial Hall in Sendai, Japan, September 25-28, 2012)　213-214　2012/09/25
Microstructures and grain size distribution of pulverized fault rocks: Examples from SanAndreas Fault and Arima-Takatsuki Tectonic Line Peer-reviewed

Tsurugi Nakatani, Jun Muto, Osamu Nishikawa, Hiroyuki Nagahama, Kenshiro Otsuki

G-COE symposium 2012; Achievements of G-COE Program for Earth and Planetary Dynamics (G-COE symposium 2012, Sendai City War reconstruction Memorial Hall in Sendai, Japan, September 25-28, 2012)　215-216　2012/09/25
Rheological profile across the northeastern Japan lithosphere toward precise modeling of the 2011 Tohoku Oki Earthquake Invited Peer-reviewed

Jun Muto, Mako Ohzono

Jour. Geol. Soc. Japan,　118　(5)　323-333　2012/05/01
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2012.0026 　

ISSN： 0016-7630

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A two-dimensional rheological profile crossing the northeastern Japan arc was created to evaluate and distinguish various styles of post-seismic deformation relating to the 2011 Tohoku-Oki earthquake. The calculated profile is based on recent rock-mechanics studies and geophysical observations that explain observed patterns of geodetic strain accumulation and shallow seismicity prior to the earthquake. Viscosities were then calculated assuming stress-change magnitudes commonly associated with interplate earthquakes. Recently derived flow laws for various rocks and minerals predict the presence of weak zones that developed via processes likely operating in the lithosphere (e.g., partial melting and shear zone development). Strain localization into weak zones explains low viscosity estimates (10¹⁸—10²⁰ Pas) from post-seismic creep after inland earthquake events. Our calculations reveal significant lateral variations in strengths and viscosities across the northeastern Japan arc. These viscoelastic lithospheric structures should be taken into account in order to differentiate viscous relaxation from other post-seismic deformation processes.
Experimental study about mechanical behavior of simulated fault gouge toward unstable slip Peer-reviewed

Momoko Hirata, Jun Muto, Hiroyuki Nagahama, Kenshiro Otsuki

Proceeding of 10th Internatinal Workshop on WATER DYNAMICS　80　2012/04/01
Fractal properties of fracture in rock mineral using 3D X-ray CT measurement Peer-reviewed

Junko Yamaki, Jun Muto, Hiroyuki Nagahama, Osamu Sasaki, Harumasa Kano

Proceeding of 10th Internatinal Workshop on WATER DYNAMICS　82　2012/04/01
Microstructures and grain size distribution of pulverized fault rocks Peer-reviewed

Jun Muto, Tsurugi Nakatani, Osamu Nishikawa, Hiroyuki Nagahama

Proceeding of 10th Internatinal Workshop on WATER DYNAMICS　79　2012/04/01
Experimental investigation of the effect of water on fabric development of anorthite Peer-reviewed

Fukuda J, Muto J, Nagahama H

The 9th International Workshop on Water Dynamics, Sendai, P2, Japan, 7-9, March, 2012　2012/03/07
Water introduction into porycrystalline feldspar and enhancement of plastic deformation

Fukuda Jun-ichi, Muto Jun, Hiroyuki Nagahama

Annual Meeting of the Geological Society of Japan　2012　113-113　2012
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2012.0_113 　
Mechanism of the formation of mineral inclusions: an example from quartz inclusions in garnet porphyroblasts

Okamoto Atsushi, Fukuda Jun-ichi, Muto Jun

Annual Meeting of the Geological Society of Japan　2012　172-172　2012
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2012.0_172 　
地震発生先行過程に伴うラドン放出と地殻変形

長濱裕幸, 武藤潤

「地震に先行する大気中ラドン濃度変動に関する観測, 「災害の軽減に貢献するための地震火山観測研究計画の推進について成果」報告書　2012
Geodetic evidence of viscoelastic relaxation after the 2008 Iwate-Miyagi Nairiku earthquake Peer-reviewed

Mako Ohzono, Yusaku Ohta, Takeshi Iinuma, Satoshi Miura, Jun Muto

Earth, Planets and Space　64　(9)　759-764　2012

DOI： 10.5047/eps.2012.04.001 　

ISSN： 1343-8832

eISSN： 1880-5981
Electric potential changes associated with nucleation of stick-slip of simulated gouges Peer-reviewed

Kumi Onuma, Jun Muto, Hiroyuki Nagahama, Kenshiro Otsuki

Tectonophysics　502　(3-4)　308-314　2011/04

DOI： 10.1016/j.tecto.2011.01.018 　

ISSN： 0040-1951
Rheological structure of northeastern Japan lithosphere based on geophysical observations and rock mechanics Peer-reviewed

Jun Muto

Tectonophysics　503　(3-4)　201-206　2011/04

DOI： 10.1016/j.tecto.2011.03.002 　

ISSN： 0040-1951
Plastic anisotropy and fabric evolution in sheared and recrystallized quartz single crystals Peer-reviewed

Jun Muto, Greg Hirth, Renee Heilbronner, Jan Tullis

Journal of Geophysical Research: Solid Earth　116　(2)　2011/02/01

DOI： 10.1029/2010JB007891 　

ISSN： 2169-9313

eISSN： 2169-9356
石英のすべり摩擦による放電発光と地震前兆電磁気現象について Invited

武藤潤, 長濱裕幸, 三浦崇, 荒川一郎

月刊地球　32　(8)　484-490　2010/08/01
Publisher:
ISSN： 0387-3498
Electromagnetic signals prior to stick slip and microstructural development in simulated gouges Peer-reviewed

Onuma, K, Muto, J, Nagahama, H, K. Otsuki

Proc. GCOE Symposium “ HYPERLINK "http://www.aob.geophys.tohoku.ac.jp/%7Egcoe-arc2010/" \\t "_blank" Earthquakes, Active Tectonics and Geodynamics of Island Arcs”　2010
Skin depth of electromagnetic wave through fractal crustal rocks Peer-reviewed

Kazutaka Takahara, Jun Muto, Hiroyuki Nagahama

IEEJ Transactions on Fundamentals and Materials　130　(3)　6-264　2010

DOI： 10.1541/ieejfms.130.258 　

ISSN： 0385-4205

eISSN： 1347-5533
Plastic anisotropy and LPO development in sheared and recrystallized quartz single crystals. Peer-reviewed

Muto, J, Hirgh, G, Heilbronner, R, Tullis, J

EOS Trans. AGU　2009/12
Skin depth of electromagnetic wave through fractal porous rocks Peer-reviewed

K. Takahara, J. Muto, H. Nagahama

EMSEV-DEMETER Joint Workshop, September 7-12, 2008, Sinaia, Romania, 4.4, Session: 4 Generation and popagation mechanism of EM signals, and related laboratory experiments　2008/09
Frictional discharge plasma and seismo-electromagnetic phenomena Peer-reviewed

Jun Muto, Hiroyuki Nagahama, Takashi Miura, Ichiro Arakawa

Physics of the Earth and Planetary Interiors　168　(1-2)　1-5　2008/05

DOI： 10.1016/j.pepi.2008.04.014 　

ISSN： 0031-9201
Frictional discharge at fault asperities: Origin of fractal seismo-electromagnetic radiation Peer-reviewed

Jun Muto, Hiroyuki Nagahama, Takashi Miura, Ichiro Arakawa

Tectonophysics　431　(1-4)　113-122　2007/02/20

DOI： 10.1016/j.tecto.2006.05.045 　

ISSN： 0040-1951

eISSN： 1879-3266
Frictional discharge from sheared asperities: Implication for fractal seismo-electromagnetic radiation Peer-reviewed

Jun Muto, Hiroyuki Nagahama, Takashi Miura, Ichiro Arakawa

IEEJ Transactions on Fundamentals and Materials　126　(4)　242-243　2006
Publisher: The Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejfms.126.242 　

ISSN： 0385-4205

eISSN： 1347-5533
Frictional discharge plasma from natural semiconductor/insulator junctions: Origin of seismo-electromagnetic radiation Peer-reviewed

Jun Muto, Hiroyuki Nagahama, Takashi Miura, Ichiro Arakawa

Physics and Chemistry of the Earth　31　(4-9)　346-351　2006

DOI： 10.1016/j.pce.2006.02.040 　

ISSN： 1474-7065
Frictional discharge plasma and origin of fractal seismo-electromagnetic radiation Invited Peer-reviewed

J. Muto, H. Nagahama, T. Miura, I. Arakawa

21COE International Symposium 2005, Spatial and Temporal Fluctuations in the Solid Earth, - Clues to the Future of Our Planet -, July 22 - 27, 2005, Sendai, Japan.　176-177　2005/07
Electric discharge plasma from frictional nature quartz: One origin of seismo-electromagnetic radiation Invited Peer-reviewed

J. Muto, H. Nagahama, T. Miura, I. Arakawa

Proceedings of the 4th IWSE (International Workshop on Seismo Electromagnetics), March 15-17, 2005, Chofu, Tokyo.　2005
Water distribution in dynamically recrystallized quartz grains: Cathodoluminescence and micro-infrared spectroscopic mapping Peer-reviewed

Jun Muto, Hiroyuki Nagahama, Tetsuo Hashimoto

Geological Society Special Publication　245　397-407　2005

DOI： 10.1144/GSL.SP.2005.245.01.19 　

ISSN： 0305-8719
Electric-discharge luminescence between frictional natural quartz by pin-on-disk method: Possible origin of seismo-electromagnetic radiation Peer-reviewed

J. Muto, H. Nagahama, T. Miura, I. Arakawa

EOS Trans AGU　85 (47)　Abstract T51B-0446　2004/12
Microinfrared reflection spectroscopic mapping: Application to the detection of hydrogen-related species in natural quartz Peer-reviewed

J. Muto, H. Nagahama, T. Hashimoto

Journal of Microscopy　216　(3)　222-228　2004/12

DOI： 10.1111/j.0022-2720.2004.01419.x 　

ISSN： 0022-2720
Micromorphic continuum with defects and lattice preferred orientation: Application to seismic anisotropy in polycrystals Peer-reviewed

J. Muto, Y. Kawada, H. Nagahama

Workshop on "Probing Earth Media Having Small-Scale Heterogeneities" Proceedings (Aoba Memorial Hall, Tohoku Univ., Sendai, Japan, 22-23 November, 2004)　58-61　2004/11
Infrared lattice vibrational modes and hydrolytic weakening of dynamically recrystallized quartz Peer-reviewed

J. Muto, H. Nagahama, T. Hashimoto

2nd International workshop on Water Dynamics　97-100　2004/11
Strain weakening of nature recrystallized quartz by hydrous point defects Invited Peer-reviewed

J. Muto, H. Nagahama, T. Hashimoto

Gordon Research Conference, The Role of Water in Rock Deformation. Mount Holyoke College, South Hadley, Massachusetts　2004/08
Dielectric anisotropy and deformation of crustal rocks: Physical interaction theory and dielectric mylonites Peer-reviewed

Jun Muto, Hiroyuki Nagahama

Physics of the Earth and Planetary Interiors　141　(1)　27-35　2004/01/15

DOI： 10.1016/j.pepi.2003.09.009 　

ISSN： 0031-9201
P-120 Infrared Vibrational Modes and Hydrolytic Weakening of Recrystallized Quartz

MUTO Jun, NAGAHAMA Hiroyuki, HASHIMOTO Tetsuo

Annual Meeting of the Geological Society of Japan　2004　219-219　2004
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2004.abst.0_219_2 　
O-130 Seismic Ray Theory and Finsler Geometry

NAGAHAMA Hiroyuki, MUTO Jun, KAWADA Yusuke, YAJIMA Takahiro

Annual Meeting of the Geological Society of Japan　2004　90-90　2004
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2004.abst.0_90_2 　
New micro-IR spectroscopic mapping: Application to natural quartz Peer-reviewed

J. Muto, H. Nagahama, T. Hashimoto

First International Meeting on Applied Physics (APHYS-2003) Badajoz (Spain), Book of Abstract　796　2003/08
Fabric transitions of Quartz C-axis: Influence of hydrogen defects Peer-reviewed

J. Muto, H. Nagahama, T. Hashimoto

JSS05 Physics and Chemistry of Earth Materials (IASPEI, IAVCEI, IAGA) XXIII General assembly of the International Union of Geodesy and Geophysics in Sapporo, Japan from June 30-July 11, 2003 (IUGG2003), Abstracts week A　A178-179, JSS05/03P/A04-006　2003/07
Fabric transitions of quartz C-axis induced by hydrogen defects Peer-reviewed

J. Muto, H. Nagahama, T. Hashimoto

Geophysical Research Abstract　08040　2003/04
Cathodoluminescence and Micro-IR Spectroscopic Observations : Hydrogen Mapping in Recrystallized Quartz

MUTO Jun, NAGAHAMA Hiroyuki, HASHIMOTO Tetsuo

Annual Meeting of the Geological Society of Japan　2003　252-252　2003
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2003.0_252_2 　
O-240 Dielectric anisotropy and deformation of crustal rocks by the differential geometric theory of the physical interaction field

MUTO Jun, NAGAHAMA Hiroyuki

Annual Meeting of the Geological Society of Japan　2002　118-118　2002
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2002.0_118_2

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Misc. 17

ローソナイトの脱水と稍深発地震に関する実験的研究

角田明博, 白石令, 武藤潤, 鈴木昭夫, 長濱裕幸

日本地球惑星科学連合大会予稿集(Web)　2018　ROMBUNNO.SCG63‐P03 (WEB ONLY)　2018
高温・高圧下における下部地殻岩石のレオロジーに対する水の効果

木戸正紀, 武藤潤, 小泉早苗, 長濱裕幸

日本地質学会学術大会講演要旨　124th　245　2017/09/10
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2017.0_474 　

ISSN： 1348-3935

eISSN： 2187-6665
DISCOVERY OF RUBINITE, Ca3Ti23+Si3O12, A NEW GARNET MINERAL IN REFRACTORY INCLUSIONS FROM CARBONACEOUS CHONDRITES.

Chi Ma, Takashi Yoshizaki, Alexander N. Krot, John R. Beckett, Tomoki Nakamura, Kazuhide Nagashima, Jun Muto, Marina A. Ivanova

METEORITICS & PLANETARY SCIENCE　52　A211-A211　2017/08

ISSN： 1086-9379

eISSN： 1945-5100
アイソトープ実験施設の排気モニタによる東北地方太平洋沖地震(Mw9.0)に先行する大気中ラドン濃度変動の検討

安岡由美, 長濱裕幸, 武藤潤, 大森康孝, 鈴木俊幸, 本間好, 山本文彦, 高橋克彦, 向高弘

日本薬学会年会要旨集(CD-ROM)　137th　ROMBUNNO.26PA‐am132　2017
AlphaGUARDを用いた空気中ラドン濃度測定の検討

南のどか, 田中綾, 安岡由美, 長濱裕幸, 武藤潤, 飯本武志, 大森康孝, 床次眞司, 向高弘

日本薬学会年会要旨集(CD-ROM)　136th　ROMBUNNO.28AB‐AM415　2016
Effect of water on plastic deformation of anorthite in high pressure

Kido Masanori, Muto Jun, Koizumi Sanae, Nagahama Hiroyuki

Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences　2015　(0)　30-30　2015
Publisher: Japan Association of Mineralogical Sciences
DOI： 10.14824/jakoka.2015.0_30 　

ISSN： 1348-6543

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Presence of water enhances plastic deformation of minerals. We performed axial compression experiments on very fine grained (~3 μm) anorthite aggregates. We added water of 0.5 wt% and investigated the effects of water on mechanical properties of anorthite in high temperature and pressure conditions. Experiment with 0.5 wt%-added water shows significant strength reduction compared to the strength predicted by lower pressure experiments (Rybacki et al., 2006). This implies that the effect of water in higher pressure condition might be larger than those predicted by lower pressure experiments.
P1-36 CM炭素質コンドライトの岩石学的特徴に基づいたC型小惑星の水質変成による物質進化過程(ポスターセッション1,ポスター発表)

仲田愛里, 中村智樹, 木村勇気, 武藤潤

日本惑星科学会秋期講演会予稿集　2014　"P1-36"　2014/09/10
Publisher: 日本惑星科学会
和歌山における大気中ラドン濃度変動

後藤美加子, 安岡由美, 長濱裕幸, 武藤潤, 井原勇人, 向高弘

アイソトープ・放射線研究発表会要旨集　51st　44　2014/06/20
Anomalous change in the atmospheric radon concentration prior to the 2011 Tohoku-Oki Earthquake in Japan. Peer-reviewed

Hayashi, K, Kobayashi, Y, Yasuoka,Y, Nagahama, H, Muto, J, Omori, Y, Suzuki, T, Homma, Y

In: Proceedings of the 15th Workshop on Environmental Radioactivity, Miura T, Kinoshita N (eds), High Energy Accelerated Research Organization (KEK), Tsukuba　23-28　2014

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Abstract:Anomalous changes in the radon concentration in the atmosphere have been reported to occur prior to earthquakes. To determine whether anomalous changes were observed before the 2011 Tohoku-Oki Earthquake in Japan, the atmospheric daily minimum radon concentrations collected in Fukushima prefecture, Miyagi prefecture and Tochigi prefecture during 8-year, 4-year and 3-year periods, respectively, were analyzed. The time series variations of the radon concentrations from the de-trended levels were obtained by subtracting the linear trends (or mean values) and the seasonal variations from the corresponding daily minimum radon concentrations. Based on these results, the outlier values and sharp decreases in the radon concentration determined (greater than ± 3σ compared to the radon variation during the normal period) occurred simultaneously at each site prior to the earthquake. This result raises the possibility of a link between these anomalous changes in the radon concentration and seismic deformation.
宮城・福島・栃木における大気中ラドン濃度変動について:東北地方太平洋沖地震の先行現象

小林由布香, 畠中弘哉, 安岡由美, 長濱裕幸, 武藤潤, 鈴木俊幸, 本間好, 山本文彦, 高橋克彦, 向高弘

アイソトープ・放射線研究発表会要旨集　50th　141　2013/06/20
X線CTを用いた岩石割れ目の空間分布の異方性・不均質性

八巻淳子, 武藤潤, 長濱裕幸, 佐々木治, 鹿納晴尚

日本地質学会学術大会講演要旨　120th　2013

ISSN： 1348-3935
Atmospheric radon concentration linked to crustal strain prior to and/or after earthquakes. Peer-reviewed

Hatanaka H, Yasuoka Y, Muto J, Nagahama H, Suzuki T, Homma Y, Sakashita M, Kobayashi Y, Mukai T

In: Proceedings of the 14th Workshop on Environmental Radioactivity, Miura T, Kinoshita N (eds), High Energy Accelerated Research Organization (KEK), Tsukuba (in Japanese, with English abstr.)　379-385　2013
Deformation of the northeastern Japan arc inferred from rheology of rocks and minerals

MUTO Jun

2011　39-39　2011/09/05

ISSN： 1348-6543
Quartz amorphization due to Pin-on-disk friction experiment

Nakamura Yu, Muto Jun, Nagahama Hiroyuki, Miura Takashi, Arakawa Ichiro

Annual Meeting of the Geological Society of Japan　2011　(0)　262-262　2011
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2011.0.262.0 　

ISSN： 1348-3935
Micromorphic continuum with defects and Taylor-Bishop-Hill theory for polycrystals: Anisotropic propagation of seismic waves and the Golebiewska gauge

Jun Muto, Yusuke Kawada, Hiroyuki Nagahama

Earthquake Source Asymmetry, Structural Media and Rotation Effects　317-328　2006
Publisher: Springer Berlin Heidelberg
DOI： 10.1007/3-540-31337-0_24 　
Frictional discharge plasma and seismo-electromagnetic precursor

Nagahama Hiroyuki, Muto Jun, Miura Takashi, Arakawa Ichiro

Annual Meeting of the Geological Society of Japan　2005　(0)　261-261　2005
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2005.0_261_2 　

ISSN： 1348-3935
28pWR-11 Luminescence and triboelectricity between pieces of natural quartz by pin-on-disk experiment

Arakawa I., Miura T., Hashimoto M., Hirade K., Nagahama H., Muto J., Ogiso S.

Meeting Abstracts of the Physical Society of Japan　59　(0)　918-918　2004
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.59.1.4.0_918_1 　

ISSN： 1342-8349

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Books and Other Publications 1

図説地球科学の事典（鳥海光弘編）

武藤潤

朝倉書店　2018/03

Presentations 50

2011年東北沖地震の余効変動における粘弾性緩和と深部余効すべりの非線形相互作用

武藤潤, JDP. Moore, S. Barbot, 飯沼卓史, 太田雄策, 岩森光

日本地球惑星科学連合　2018/05/22
マスターカーブ法によるかんらん石の粘弾性解析

八代正和, 武藤潤, 長濱裕幸

日本地球惑星科学連合　2018/05/20
石英多結晶体の粒界古ひずみ速度計の改良

鈴木来夢, 長濱裕幸, 武藤潤

日本地球惑星科学連合２０１８　2018/05/20
ローソナイトの脱水と稍深発地震に関する実験的研究

角田明博, 白石令, 武藤潤, 鈴木昭夫, 長濱裕幸

日本地球惑星科学連合２０１８　2018/05/20
活性炭型ラドン検出器による屋内ラドン濃度測定の検討

藤井さとみ, 新井友里愛, 安岡由美, 飯本武志, 床次眞司, Miroslaw Janik, 長濱裕幸, 武藤潤, 向高弘

第67回日本薬学会近畿支部大会　2017/10/14
Heterogeneous rheology controlled the post-seismic deformation of the 2011 Tohoku Oki Earthquake. Invited

MUTO Jun

2017/06/19
Heterogeneous rheological structures of the northeastern Japan illuminated by post-seismic deformation of the 2011 Tohoku-oki earthquake. Invited

MUTO Jun

1) Joint Meeting JpGU-AGU 2017, Makuhari　2017/05/12
アイソトープ実験施設の排気モニタによる東北地方太平洋沖地震（Mw9.0）に先行する大気中ラドン濃度変動の検討

安岡由美, 長濱裕幸, 武藤潤, 大森康孝, 鈴木俊幸, 本間好, 山本文彦, 高橋克彦, 向高弘

日本薬学会第137年会　2017/03/26
Effect of infiltrated water on rheology of plagioclase feldspar under lower crustal condition International-presentation

Masanori KIDO, Jun MUTO, Sanae KOIZUMI, Hiroyuki NAGAHAMA

AGU Fall Meeting　2016/12/10
CLARIFICATION OF SHEAR ZONE DEVELOPMENT IN A GOUGE LAYER RELATED TO SLIP INSTABILITY

Momoko Hirata, Jun Muto, Hiroyuki Nagahama

-The Second International Conference on Science, Engineering & Environment　2016/11/22
Heterogeneous rheological structures of the northeastern Japan illuminated by post-seismic deformation of the 2011 Tohoku-oki earthquake. Invited

武藤潤

1) Workshop on Faulting and Earthquake Dynamics, State Key laboratory of Earthquake dynamics.　2016/08/06
Rheology of Water-infiltrated Polycrystalline Anorthite Under the Conditions of Lower Crust

Masanori KIDO, Jun MUTO, Sanae KOIZUMI, Hiroyuki NAGAHAMA

International Symposium Crustal Dynamics 2016　2016/07/21
Energetic Analysis of Critical Slip Displacement on Slip Instability

Momoko Hirata, Jun Muto, Hiroyuki Nagahama

International Symposium Crustal Dynamics 2016　2016/07/21
The Energetic Assessment of Frictional Instability Based on Rowe’s Theory. International-presentation

Hirata, M, Muto, J, Nagahama, H

AGU Fall Meeting　2015/12/10
Calibration law for stress measurements of Griggs-type solid medium deformation apparatu International-presentation

Kido M, Muto J, Nagahama H

Water Dynamics 12　2015/03/09
Strain fields of the NE Japan with heterogeneous rheological structure during subduction zone earthquake cycles International-presentation

J. Muto, B. Shibazaki, M. Ohzono

Asia Oceania Geosciences Society　2014/07/28
Three-dimensional Rheological Structure of the Northeastern Japan Arc and Its Viscoelastic Deformation after the 2011 Tohoku-oki Earthquake International-presentation

B. Shibazaki, Y. Nakai, J. Muto, T. Iinuma

Asia Oceania Geosciences Society　2014/07/28
FEM modeling on stress-strain fields of subduction zone during megathrust earthquake cycles International-presentation

Jun Muto, B. Shibazaki, T. Iidaka, M. Ohzono

American Geophysical Union Fall Meeting　2013/12/07
The friction experiments using simulated fault gouge: Rowe's constant energy ratio, American International-presentation

Hirata, M, Muto, J, Nagahama, H, Otsuki K

American Geophysical Union Fall Meeting　2013/12/07
The electromagnetic radiation from semiconductor minerals in the orebody International-presentation

Ozawa, M, Muto, J, Nagahama, H, Nagase, T

American Geophysical Union Fall Meeting　2013/12/07
Inhomogeneity of fractal property in rock minerals using 3D X-ray CT measurement International-presentation

unko Yamaki, Jun Mutoa, Hiroyuki Nagahama, Osamu Sasaki, Harumasa Kano

2nd G-EVER International Symposium　2013/10/19
Seismic luminous phenomena and VHF electromagnetic emission originated from radon emanation International-presentation

Asuka Seki, Izumi Tohbo, Yasutaka Omori, Jun Muto, Hiroyuki Nagahama

2nd G-EVER International Symposium　2013/10/19
Electromagnetic radiations from semiconductor minerals. International-presentation

Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

2nd G-EVER International Symposium　2013/10/19
Self-affinities Analysis of Fault-related Folding International-presentation

Kazuhei Kikuchi, Kazutoshi Abiko, Hiroyuki Nagahama, Jun Muto

2nd G-EVER International Symposium　2013/10/19
半導体鉱物の電気特性と摩擦・破壊に伴う放電現象

小沢光幸, 武藤潤, 長濱裕幸, 長瀬敏郎

日本地質学会第120年学術大会　2013/09/16
ガス圧試験機を用いた岩石の弾性波速度測定における封圧の影響

玉井速汰, 武藤潤, 長濱裕幸, 石川正弘

日本地質学会第120年学術大会　2013/09/16
東北大学固体圧式変形試験機の応力測定精度評価

木戸正紀, 武藤潤, 長濱裕幸

日本地質学会第120年学術大会　2013/09/16
模擬断層ガウジの挙動に関する実験的研究

平田萌々子, 武藤潤, 長濱裕幸, 大槻憲四郎

日本地質学会第120年学術大会　2013/09/16
Rheological structure of the NE Japan island arc-trench system and viscoelastic stress relaxation after the 2011 Tohoku Oki Earthquake. International-presentation

Jun Muto, Bunichiro Shibazaki, Yoshihiro Ito, Takeshi Iinuma, Mako Ohzono, Takumi Matsumoto, Tomomi Okada

International Symposium of Rock Mechanics　2013/08/01
Self-affinity of fracture in glass or rock mineral by 3D X-ray CT measurement International-presentation

Junko Yamaki, Jun Muto, Hiroyuki Nagahama

International Symposium of Rock Mechanics　2013/08/01
模擬断層ガウジの圧密に関する実験的研究

平田萌々子, 武藤潤, 長濱裕幸, 大槻憲四郎

日本地球惑星科学連合2013年大会　2013/05/19
ガス圧試験機を用いた沈み込み帯岩石の弾性波速度測定

玉井速汰, 武藤潤, 長濱裕幸, 石川正弘

日本地球惑星科学連合2013年大会　2013/05/19
硫化鉱物の整流特性と地球電磁気現象への応用

小沢光幸, 武藤潤, 長濱裕幸, 長瀬敏郎

日本地球惑星科学連合2013年大会　2013/05/19
３次元X線CTを用いた岩石試料の割れ目のフラクタル幾何学的特性

八巻淳子, 武藤潤, 長濱, 裕幸ほか

日本地球惑星科学連合2013年大会　2013/05/19
東北日本弧不均質粘性構造を考慮した東北沖地震の2次元余効変動解析

武藤潤, 芝崎, 文一郎, 大園, 真子ほか

日本地球惑星科学連合2013年大会　2013/05/19
人工アノーサイト多結晶体中の水の不均質分布と歪の局所化

福田惇一, 武藤潤, 長濱裕幸

日本地球惑星科学連合2013年大会　2013/05/19
石英岩の格子定向配列に及ぼす動的再結晶の役割

武藤潤, 金子, 英亮, 長濱裕幸

日本地球惑星科学連合2013年大会　2013/05/19
関東北部から東北地方にかけてのS波偏向異方性の地域的特徴

飯高隆, 小原一成, 五十嵐, 俊博, 武藤潤, 芝崎文一郎

日本地球惑星科学連合2013年大会　2013/05/19
地殻岩石の電磁波スキンデプスとフラクタル特性

高原一峰, 長濱裕幸

日本地質学会　2010/09/18
東北日本弧のレオロジープロファイル－最近の実験結果から－

地殻ダイナミクスの総合的理解：地球物理学と物質科学の知見の総合　2010/07/24
Rheology of the island arc crust based on current understanding on rock deformation International-presentation

G-COE symposium 2010: Dynamic Earth and Heterogeneous Structure　2010/07/13
Electric voltage variation by nucleation of stick-slip of simulated gouges International-presentation

Onuma, K, Muto, J, Nagahama, H, Otsuki, K

G-COE symposium 2010: Dynamic Earth and Heterogeneous Structure　2010/07/13
Pulverization of quartz single crystal induced by possible super-shear stick-slips International-presentation

Nishikawa, O, Muto, J, Otsuki, K

G-COE symposium 2010: Dynamic Earth and Heterogeneous Structure　2010/07/13
模擬断層ガウジの固着すべりに先行する電磁変動と微細組織発達

大沼久美, 武藤潤, 長濱裕幸, 大槻憲四郎

日本地球惑星科学連合大会　2010/05/23
摩擦すべりによる人工水晶単結晶の粉砕と超剪断破壊の可能性

西川治, 武藤潤, 大槻憲四郎

日本地球惑星科学連合大会　2010/05/23
Electromagnetic signals prior to stick slip and microstructural development in simulated gouges International-presentation

Onuma, K, Muto, J, Nagahama, H, Otsuki, K

G-COE symposium 2010: Earthquakes, Active Tectonics and Geodynamics of Island Arcs　2010/02/19
地震先行現象としての電磁放射とラドン散逸：模擬断層ガウジによる実験的アプローチ

大沼久美, 武藤潤, 大森康孝, 長濱裕幸, 大槻憲四郎

東京大学地震研究所地震・火山噴火予知公募研究先行過程部門研究集会　2010/02/16
Plastic anisotropy and LPO development in sheared and recrystallized quartz single crystals International-presentation

Muto, J, Hirth, G, Heilbronner, R, Tullis, J

American Geophysical Union Fall Meeting　2009/12/14
Geometrical softening of experimentally sheared synthetic quartz single crystals

Muto, J, Tullis, J, Heilbronner, R

日本地質学会　2009/09/04
岩石のすべり摩擦による放電発光と地震前兆電磁気現象について

武藤潤, 長濱裕幸, 三浦崇, 荒川一郎

日本地球惑星科学連合大会　2009/05/16

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Research Projects 27

破壊実験と断層調査から解明する地震のエネルギー散逸過程

長濱裕幸, 武藤潤, 奥村聡, 河野義生, 澤燦道

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2024/04/01 - 2027/03/31
放射光X線オペランド剪断実験による地震発生準備過程の解明

高橋美紀, 武藤潤, 上杉健太朗

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 国立研究開発法人産業技術総合研究所

2024/04/01 - 2027/03/31
Postseismic model for predicting crustal deformation and seismicity after the 7Tohoku-oki earthquake

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2027/03/31
Postseismic model for predicting crustal deformation and seismicity after the 7Tohoku-oki earthquake

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2027/03/31
Generation of CO2 fluid and mantle carbonation in subduction zones

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (S)

Institution: Tohoku University

2022/04/27 - 2027/03/31
Stress estimates along the subduction boundary and next-generation of thermal models

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: The University of Tokyo

2021/04/01 - 2026/03/31
Estimating subduction boundary stresses and incorporation in next-generation modeling

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: The University of Tokyo

2021/04/01 - 2026/03/31
動的断層弱化の物理・化学機構解明を目指した放射光オペランド摩擦実験法の開発

武藤潤, 廣瀬丈洋, 八木和行

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的研究(萌芽)

Institution: 東北大学

2022/06/30 - 2025/03/31

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本研究では、放射光施設でも使用可能な小型の摩擦試験機の自作設計を検討していた。令和5年度は、九州大学の八木研究室で見学したYagi et al. (2016Tribology) の実験機を参考に、岩石、セラミックスの高速摩擦実験が可能な試験機の設計製作を行った。Yagi et al.では、金属（ステンレス丸棒）を使用した実験治具を用いていたが、本研究では地震断層を模擬した実験機の製作を目的としているため、セラミックスを高速で保持する機構を設計に加えた実験機を製作した。具体的には、圧力締結を使った鉱物ビーズとディスク保持具の設計を採用した。これらの実験機全体の設計はR５年度秋頃には終わっていたものの、世界的な物品の供給不足（特にモーターや機械部品など）により、高速回転する摩擦ディスクの保持部を構成する大型薄型ベアリングおよび高速モーターが手に入らず、納期の目処が立たない状況にあった。やっと、R6年度に入ってから、これら機械部品の納期が決定し、現在R6年度５月中旬の納品を待っている状況である。今後試験機が到着次第、より早期にオフラインでの摩擦実験を開始し、放射光実験が行えることを目指した実験を進めていく。
超巨大地震発生域の高温高岩圧高間隙水圧環境を再現した岩石変形実験への挑戦

岡崎啓史, 澤井みち代, 武藤潤

Offer Organization: 日本学術振興会

System: 科学研究費助成事業挑戦的研究(開拓)

Category: 挑戦的研究(開拓)

Institution: 広島大学

2022/06/30 - 2025/03/31
Earthquake and Volcano Hazards Observation and Research Program

Offer Organization: Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan

2024/04 -

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his study was supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan under its Earthquake and Volcano Hazards Observation and Research Program (1207, THK_10, THK_08 given to H.N.).
Transient rheology of upper mantle inferred from the postseismic deformation of 2011 Tohoku-oki earthquake

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for JSPS Fellows

Institution: Tohoku University

2021/04/28 - 2023/03/31
2011年東北沖地震後の余効変動から知る上部マントルの遷移レオロジー

武藤潤, MASUTI SAGAR

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2020/11/13 - 2023/03/31
2011年東北沖地震後の余効変動から知る上部マントルの遷移レオロジー

武藤潤, MASUTI SAGAR

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2020/09/25 - 2023/03/31
n situ observation of fracture propagation of rocks and fault damage by synchrotron ultra fast X ray imaging

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2020/04/01 - 2023/03/31
花崗岩類の脆性ー塑性遷移領域での力学挙動と地殻応力に関する実験的研究 Competitive

武藤潤, 東, 理学研究科

Offer Organization: 日本学術振興会

System: 基盤研究(B)

2018/04 - 2020/03
放射光ビームラインでの高圧実験から明らかにする深発地震の発生機構 Competitive

武藤潤

Offer Organization: 東京海上

System: 各務地震研究助成

2017/10 - 2018/09
地殻ダイナミクスー東北沖地震後の内陸変動の統一的理解ー(国際活動支援班) Competitive

飯尾能久, 防災研究所

Offer Organization: 日本学術振興会

System: 新学術領域研究(研究領域提案型)

2015/04 - 2018/03
岩石変形実験による地殻の力学物性の解明：流体の影響 Competitive

清水以知子, 理学研究科

Offer Organization: 日本学術振興会

System: 新学術領域研究(研究領域提案型)

2014/04 - 2018/03
地殻ダイナミクスー東北沖地震後の内陸変動の統一的理解ー Competitive

飯尾能久, 防災研究所

Offer Organization: 日本学術振興会

System: 新学術領域研究(研究領域提案型)

2014/04 - 2018/03
Fundamental study on mineral vein formation by sealing experiment of rock fracture

Atsushi Okamoto, Muto Jun, Yamada Ryo, Saishu Hanae, Tanaka Hiroto, Wendler Frank

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2014/04/01 - 2017/03/31

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A new hydrothermal flow-through apparatus was developed, which enables us to investigate the dissolution and precipitation processes of fractured rocks at sub to supercritical conditions under confining pressure, and the evolution of aperture structures by X-ray CT. In the dissolution experiments of fractured granite, large pores and preferential flow paths were created by rapid dissolution of quartz and gauge parts, suggesting that formation of large fluid pockets induced by water-rock interaction within the crusts. In silica precipitation experiment at supercritical condition, amorphous silica precipitated at the inlet, which caused fracture sealing effectively, compared to quartz overgrowth from the fracture walls. The fracture sealing by silica precipitation produced a characteristic fluid pressure oscillation, which may indicate an importance analogue of the cycle of silica precipitation - fluid pressure rise (earthquake).
不均質岩石レオロジーを考慮した東北沖地震の余効変動解析 Competitive

武藤潤

Offer Organization: 山田科学振興財団

System: 研究助成

2014/10 - 2016/03
東北沖地震後の地殻変動を予測する岩石の遷移挙動レオロジーの実験的研究 Competitive

武藤潤, 理学(系, 研究科

Offer Organization: 日本学術振興会

System: 基盤研究(B)

2014/04 - 2016/03
東北日本弧プレート境界面の力学特性解明を目指した実験的研究 Competitive

長濱裕幸, 理学(系, 研究科

Offer Organization: 日本学術振興会

System: 基盤研究(A)

2012 - 2014
下部地殻部分溶融体のレオロジーと弾性波速度に関する実験的研究 Competitive

武藤潤, 理学(系, 研究科

Offer Organization: 日本学術振興会

System: 若手研究(B)

2010/04 - 2013/03
Investigation of stress field and pulverization mechanism at the fault rapture front propagating at a high speed

NISHIKAWA Osamu, OTSUKI Kenshiro, MUTO Jun

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Akita University

2011 - 2012

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In order to clarify the mechanism of rock pulverization around fault, a series of stick-slip experiment was conducted with a gas-medium triaxial apparatus, recording strains with5MHz sampling rate for up to10 channels. The mechanical data confirmed a supershear velocity of the propagation of rapture front during large stick-slip. Fracture pattern in the pulverized cores shows obvious dependence on the slip direction. It is likely that anomalously high axial stress caused strong tension stress on the slip plane during slip resulted in pervasive mode I fractures.
下部地殻レオロジーの実験的研究:水の効果と延性破壊による震源核形成について Competitive

武藤潤, 理学(系, 研究科

Offer Organization: 日本学術振興会

System: 研究活動スタート支援

2009/04 - 2010/03
地殻の加水軟化と塑性不安定性に関する研究:再結晶石英顕微赤外マッピング法の開発

武藤潤

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特別研究員奨励費

Institution: 東北大学

2004 - 2005

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1.加水軟化に伴う再結晶石英c軸ファブリック転移赤外反射分光マッピング法と石英の微細変形組織観察から、畑川マイロナイト中の再結晶石英多結晶体のc軸ファブリックが多結晶体中のH2O、OH増加に起因する可能性を報告した。Muto et al.(2004;J.Microscopy 216,222-228)で報告した再結晶石英多結晶体の赤外反射分光マッピング測定結果と石英c軸ファブリックの測定から、畑川破砕帯で見出されたタイプIクロスガードルからY集中へのファブリックパターンの転移は含水(H2O、OH)量の増加によって引き起こされる可能性がある。通常、このファブリック転移は、変形時の温度上昇によって説明される。しかし、畑川破砕帯新田川流域においては、変成鉱物から推定される変形温度とファブリックによって推定される変形温度は一致しない。このファブリック転移は、稜面<α>すべりから柱面<α>すべりへの優先すべり系の転移によって引き起こされる。水欠陥の増加が、柱面<α>すべりの最大分解剪断応力を低下させ、稜面<α>すべりから柱面<α>すべりへの優先すべり系の転移をさせ、石英c軸ファブリックのタイプIクロスガードルからY集中へのファブリック転移を引き起こしたと考えられる。 2.石英-石英間の摩擦発光に関する研究地震電磁放射機構を明らかにするために、断層アスペリティの動きを模擬したピンオンディスク法を用いて、天然石英-石英間の摩擦による発光が、低応力・低すべり速度でも起きることを明らかにした。また、発光のサイクルが電磁放射を引き起こす可能性を指摘し、地震電磁気現象の一機構となり得ることを指摘した。さらに、断層アスペリティのフラクタル分布特性から、アスペリティ剪断に伴うこれらの研究成果の一部を国際会議および国際誌で報告した。

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Social Activities 1

宮城サイエンスカフェ

2012/11/17 -

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宮城県仙台第三高等学校サイエンスカフェ（SSH指定校）で出前授業及び高校生研究発表での講師を担当（2012年11月17日）

Media Coverage 7

東北大、大阪北部地震前の大気中ラドン濃度の減少を検出

日経オンライン https://www.nikkei.com/article/DGXLRSP607756_R00C21A4000000/

2021/04/02

Type: Internet
東北大、潮汐に由来する大気中ラドン濃度の変動を検出

日経オンライン https://www.nikkei.com/article/DGXLRSP605419_Z10C21A2000000/

2021/02/19

Type: Internet
巨大地震の「余韻」、被災地の地下深くで進む二つの現象

朝日新聞　朝日新聞デジタル　https://www.asahi.com/articles/ASN4N40WFN4NULBJ008.html

2020/04/21

Type: Newspaper, magazine
東北大など、東北沖地震後の地盤隆起の原因を解明

日本経済新聞　日本経済新聞　https://www.nikkei.com/article/DGXLRSP520070_X20C19A9000000/

2019/09/27

Type: Internet
東北大、地震活動に関連した大気中ラドン濃度の異常を検出

日本経済新聞　日本経済新聞　https://www.nikkei.com/article/DGXLRSP489592_U8A900C1000000/

2018/09/04

Type: Internet
東北大、隕石中から太陽系最古の新鉱物を発見

日本経済新聞　日本経済新聞　https://www.nikkei.com/article/DGXLRSP442334_S7A410C1000000/

2017/04/17

Type: Internet
地球のプレートは海の存在によって弱くなる

静岡新聞　静岡新聞

2016/08/27

Type: Newspaper, magazine

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Other 8

不均質レオロジーを考慮した東北沖地震後の地殻変動解析

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不均質レオロジーを考慮した東北沖地震後の地殻変動解析
高温岩石変形試験における応力測定精度向上に関する研究

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高温岩石変形試験における応力測定精度向上に関する研究
蛇紋岩の摩擦すべり特性

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蛇紋岩の摩擦すべり特性
地殻変動と大気中ラドン濃度に関する研究

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地殻変動と大気中ラドン濃度に関する研究
下部地殻レオロジーの実験的研究：延性破壊による地殻深部での震源核形成について

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近年の地球物理学的観測網の発展により、下部地殻が地震学的に “active” であると考えられ始めた（Jackson, 2002）。インド楯状地では、従来上部マントル内で起こるとされていた地震を震源決定しなおした結果、これらの地震がMoho面上部の下部地殻内で起きていることが明らかになった（Maggi et al., 2000a, b)。さらに、地表に露出する実際の下部地殻岩石中から、温度約800 ºC, 圧力約1 GPaという条件にもかかわらず、地震発生の痕跡であるシュードタキライトの産出が報告されており（Austrheim & Boundy, 1994）、下部地殻が地震を発生しうるほど強度が高いことを裏付けている。しかし、実際の下部地殻という高温高圧下でどのように地震の核形成（岩石の摩擦すべりおよび破壊）が始まるかについては明らかになっていない。下部地殻岩石のレオロジーとして、Rybacki et al. (2008) は、ガス圧式試験機（封圧400 MPa = 深度約15kmでの制岩圧に相当）を用いた、剪断変形実験から、細粒斜長岩の延性破壊が、下部地殻中での震源核形成の一因となることを指摘した。彼らの実験では、高歪で粒界に存在する微小空洞（キャビティ）が、巨視的な剪断面へと成長し、試料の延性破壊を引き起こすことが観察されている。さらに、天然のマイロナイト中の斜長石多結晶体からも、キャビティ形成による破壊面の存在が観察され（Shigematsu et al., 2004）、キャビティ形成とその発達が、地殻深部での破壊核形成の一因となる可能性が指摘されている。一方、金属学の分野では、高圧下では、空洞の発生と引き続く延性破壊が抑制されることが知られており、低封圧で行われたRybakcki et al. (2008) の実験結果を、より高圧の下部地殻へと応用出来るかどうか（つまりキャビティ形成の圧力範囲）という点については不明である。地殻深部でのキャビティ形成による地震核形成の可能性について、下部地殻に相当する圧力を発生することができるGriggs型試験機（封圧 ~ 1.4 GPa）を使い、下部地殻相当の圧力下でもキャビティ形成による延性破壊が起こるかどうかを調べる必要がある。そこで、本研究は、Griggs試験機を使い、斜長石多結晶体の高圧下でのキャビティ形成の可能性について調べ、下部地殻中での震源核形成機構について言及することを目的とする。
東北日本弧の地殻変形活動のモデル化

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東北日本弧の地殻変形活動のモデル化
地殻岩石のレオロジー特性に関する実験的研究

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地殻岩石のレオロジー特性に関する実験的研究
ピンオンディスク摩擦試験機を用いた岩石の摩擦実験

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ピンオンディスク摩擦試験機を用いた岩石の摩擦実験

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