Article
Geosciences, Multidisciplinary
John D. Bedford, Daniel R. Faulkner
Summary: The study found that quartz gouge exhibits unstable stick-slip behavior under high σn conditions, while slow-slip is more prevalent under low σn conditions. Localization and instability are mainly promoted by high effective normal stress and small grain size.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
S. Aretusini, F. Meneghini, E. Spagnuolo, C. W. Harbord, G. Di Toro
Summary: Research indicates that in subduction zones, seismic slip at shallow crustal depths may trigger tsunamis due to the low coseismic shear strength of fluid-saturated and non-lithified clay-rich fault rocks. Experiments show that shear-induced dilatancy and pressurization of fluids occur when these materials are sheared at seismic velocities, reducing the energy required for earthquake rupture propagation. These findings suggest that fluid-saturated clay-rich sediments in subduction zones can promote earthquake rupture propagation and slip due to their low permeability and tendency to pressurize when sheared at seismic slip velocities.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Sylvain Barbot
Summary: Understanding the constitutive behavior of faults is crucial in earthquake science, but a friction law applicable to the brittle crust and upper mantle at different temperatures is still missing. In this study, we investigate the effect of multiple healing mechanisms and different rock-forming minerals on the evolution of frictional resistance. The results explain the velocity- and temperature-dependence of friction for various rocks and natural fault gouges, providing insights into subcritical crack growth and inter-granular flow.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Ken-ichi Hirauchi, Ryota Hibi, Risako Shirahige, Takato Takemura
Summary: This study investigates the influence of phyllosilicate fraction in quartzo-feldspathic sediments on fault slip behavior. It is found that as the talc content increases, the coefficient of friction decreases and the slip behavior transitions from velocity-weakening to velocity-strengthening. However, friction oscillations are observed only within a narrow range of talc contents and under specific velocity conditions.
Article
Multidisciplinary Sciences
V Rubino, N. Lapusta, A. J. Rosakis
Summary: Lab experiments show that dynamic ruptures propagate through fault regions with fine rock gouge through complex and intermittent slip processes. These processes include repeated arrest of rupture propagation caused by friction strengthening at lower slip rates, and dynamic earthquake re-nucleation enabled by pronounced rapid friction weakening at higher slip rates.
Article
Geochemistry & Geophysics
Di Wang, Jan Carmeliet, Wei Zhou, Omid Dorostkar
Summary: This study investigates the influence of grain breakage on the stick-slip dynamics of a fault system, finding that particle fragmentation increases fault frictional strength and triggers numerous small slip events. As particle strength decreases, slip events become more correlated with particle fragmentation events, leading to a decrease in the number of large slip events.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Xiaofeng Chen, Sai Sandeep Chitta, Ximeng Zu, Ze'ev Reches
Summary: This study investigates the weakening processes of faults during earthquakes, emphasizing that the weakening at the rupture-front is more efficient than frictional weakening. Experimental results show that the rupture-front can rapidly weaken the entire fault, possibly occurring in natural faults as well.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Wenming Sun, Yingchun Li, Xiaotian Wu, Chun'an Tang
Summary: In this study, the stability and instability transition mechanism of faults were investigated through experiments. The results show that the shear stiffness change during fault slip undergoes four stages, with the last two stages leading to unstable slip. It is also found that the increase in normal stress and the decrease in fault roughness accelerate the shear stiffness change process.
APPLIED SCIENCES-BASEL
(2022)
Article
Geochemistry & Geophysics
Gang Ma, Jiangzhou Mei, Ke Gao, Jidong Zhao, Wei Zhou, Di Wang
Summary: Understanding the relationship between microslips and macroscopic stress fluctuations is crucial for gaining insights into geophysical processes such as earthquakes. This study uses discrete element method simulations and a machine learning approach to quantitatively connect microslips to stress fluctuations. The data-driven model successfully predicts the magnitude of stress fluctuation by incorporating the spatial distribution of microslips. The findings shed light on the mechanisms governing earthquake nucleation and the dynamics of earthquake cycles.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Multidisciplinary Sciences
John D. Bedford, Daniel R. Faulkner, Nadia Lapusta
Summary: This paper demonstrates that faults with heterogeneously distributed materials are weaker and more unstable compared to faults with homogeneously mixed materials. The results highlight the significant impact of geological heterogeneity on fault strength and stability.
NATURE COMMUNICATIONS
(2022)
Article
Geosciences, Multidisciplinary
Chowon Park, Jae Hoon Kim, Jin-Han Ree
Summary: This study investigates the fault core of the Geumwang Fault in Korea through detailed field and microanalytical investigations. The results show the presence of primary and secondary gouges in the fault core. The primary gouges are formed through frictional heat-induced decomposed siderite, while the secondary gouges are formed by the injection of fluidized gouge material. Furthermore, the fluidization process seems to neutralize the foliation of the primary slip zones.
JOURNAL OF STRUCTURAL GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Luuk B. Hunfeld, Jianye Chen, Andre R. Niemeijer, Shengli Ma, Christopher J. Spiers
Summary: Experimental research shows that rock materials exhibit dynamic weakening of 22%-81% under high velocities and large displacements, depending on normal stress and soil composition. This weakening may be achieved through thermal pressurization, and similar effects play a key role in induced seismic slip in reservoir systems like Groningen.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Multidisciplinary Sciences
Yixin Liu, Chuanhua Xu, Jiang Xu, Xuemin Zeng
Summary: The injection of fluids into fault gouges can disturb stress conditions and increase the risk of earthquakes. This study investigates the effect of water injection and shear deformation on the hydro-mechanical characteristics of fault gouges. The results show that injecting water significantly reduces the maximum shear strength, and the effect varies with the gouge fill material. Shear deformation increases the inhomogeneity of thickness distribution and leads to non-uniform distribution of injected water along the fault.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Multidisciplinary
Eric C. Bryant, WaiChing Sun
Summary: This study utilizes a phase field framework to investigate the frictional slip of strong discontinuities in geological formations of different length scales, proposing a regularized constitutive law adjusted based on loading rates and temperature ranges. Numerical examples demonstrate that this model can capture the frictional response along complex interfaces.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Geochemistry & Geophysics
E. Papachristos, I. Stefanou, J. Sulem
Summary: This study uses discrete elements simulations to investigate the frictional response of fault gouges, considering their previous ultra-cataclastic flow and long-time consolidation loading. The impact of particle characteristics (such as size, polydispersity) and shearing velocities on the gouge's response under seismogenic zone conditions is explored. Monte-Carlo analyses show that local stick-slip events disappear when a large number of numerical samples are averaged. The apparent material frictional response is largely unaffected by the spatial randomness of particles' position and particle size distribution, but is controlled by the mean particle size and the formation of shear bands.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geosciences, Multidisciplinary
Tatsuya Kubota, Ryota Hino, Daisuke Inazu, Yoshihiro Ito, Takeshi Iinuma
GEOPHYSICAL RESEARCH LETTERS
(2015)
Article
Geosciences, Multidisciplinary
Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai
GEOPHYSICAL RESEARCH LETTERS
(2016)
Article
Multidisciplinary Sciences
Laura M. Wallace, Spahr C. Webb, Yoshihiro Ito, Kimihiro Mochizuki, Ryota Hino, Stuart Henrys, Susan Y. Schwartz, Anne F. Sheehan
Article
Geosciences, Multidisciplinary
S. Katakami, Y. Yamashita, H. Yakihara, H. Shimizu, Y. Ito, K. Ohta
GEOPHYSICAL RESEARCH LETTERS
(2017)
Article
Geosciences, Multidisciplinary
Yoshihiro Ito, Matt J. Ikari, Kohtaro Ujiie, Achim Kopf
GEOPHYSICAL RESEARCH LETTERS
(2017)
Article
Geochemistry & Geophysics
Victor M. Cruz-Atienza, Yoshihiro Ito, Vladimir Kostoglodov, Vala Hjorleifsdottir, Arturo Iglesias, Josue Tago, Marco Calo, Jorge Real, Allen Husker, Satoshi Ide, Takuya Nishimura, Masanao Shinohara, Carlos Mortera-Gutierrez, Soliman Garcia, Motoyuki Kido
SEISMOLOGICAL RESEARCH LETTERS
(2018)
Article
Geochemistry & Geophysics
Masayuki Kano, Naofumi Aso, Takanori Matsuzawa, Satoshi Ide, Satoshi Annoura, Ryuta Arai, Satoru Baba, Michael Bostock, Kevin Chao, Kosuke Heki, Satoshi Itaba, Yoshihiro Ito, Noriko Kamaya, Takuto Maeda, Julie Maury, Mamoru Nakamura, Takuya Nishimura, Koichiro Obana, Kazuaki Ohta, Natalia Poiata, Baptiste Rousset, Hiroko Sugioka, Ryota Takagi, Tsutomu Takahashi, Akiko Takeo, Yoko Tu, Naoki Uchida, Yusuke Yamashita, Kazushige Obara
SEISMOLOGICAL RESEARCH LETTERS
(2018)
Article
Geochemistry & Geophysics
R. Azuma, R. Hino, Y. Ohta, Y. Ito, K. Mochizuki, K. Uehira, Y. Murai, T. Sato, T. Takanami, M. Shinohara, T. Kanazawa
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geochemistry & Geophysics
Erin K. Todd, Susan Y. Schwartz, Kimihiro Mochizuki, Laura M. Wallace, Anne F. Sheehan, Spahr C. Webb, Charles A. Williams, Jenny Nakai, Jefferson Yarce, Bill Fry, Stuart Henrys, Yoshihiro Ito
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geochemistry & Geophysics
Tatsuya Kubota, Tatsuhiko Saito, Yoshihiro Ito, Yoshihiro Kaneko, Laura M. Wallace, Syuichi Suzuki, Ryota Hino, Stuart Henrys
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geosciences, Multidisciplinary
Tomoya Muramoto, Yoshihiro Ito, Daisuke Inazu, Laura M. Wallace, Ryota Hino, Syuichi Suzuki, Spahr C. Webb, Stuart Henrys
GEOPHYSICAL RESEARCH LETTERS
(2019)
Article
Geochemistry & Geophysics
Satoshi Katakami, Yoshihiro Ito, Kazuaki Ohta, Ryota Hino, Syuichi Suzuki, Masanao Shinohara
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2018)
Article
Geosciences, Multidisciplinary
Miyuu Uemura, Yoshihiro Ito, Kazuaki Ohta, Ryota Hino, Masanao Shinohara
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2018)
Article
Geochemistry & Geophysics
Tatsuya Kubota, Ryota Hino, Daisuke Inazu, Yoshihiro Ito, Takeshi Iinuma, Yusaku Ohta, Syuichi Suzuki, Kensuke Suzuki
EARTH AND PLANETARY SCIENCE LETTERS
(2017)