Article
Multidisciplinary Sciences
Valere Lambert, Nadia Lapusta, Stephen Perry
Summary: Observations suggest that mature faults can experience large earthquakes at much lower stress levels than expected static strength. Numerical modeling shows that quasi-statically strong faults exhibit sharp, self-healing pulse-like ruptures, while persistently weak faults result in milder, crack-like ruptures with more spread-out slip. The findings raise questions about earthquake physics and the underestimated radiated energy from large earthquakes.
Article
Geosciences, Multidisciplinary
Feng Hu, David D. Oglesby, Baoning Wu, Xiaofei Chen
Summary: Rupture velocity, defined by different gradients, affects the understanding of earthquake physics. In some cases, a rupture may be classified as supershear using a 1D horizontal measure but not via the 2D gradient calculation, highlighting the importance of rupture velocity definitions for supershear analysis.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
Hong Zuo, Yulong Qin, Mingjian Liang, Kai Sun, Feipeng Huang, Cheng Liao, Wenying Zhou, Weiwei Wu, Huiping Zhang, Yao Yang
Summary: The Sichuan-Yunnan block, located in the eastern Tibetan Plateau, experiences frequent tectonic and earthquake activity. The Maisu fault, an east-west trending fault within the block, has been identified as a surface rupture zone through remote sensing imagery and field surveys. The most recent earthquake along this rupture may have occurred after 1850 +/- 30 BP, according to fault outcrop and carbon-14 dating.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Engineering, Geological
Sandip Dey, Solomon Tesfamariam
Summary: This study systematically investigates the nonlinear structural response of buried continuous steel pipelines undergoing fault rupture deformation and proposes a detailed and efficient design analysis framework. A case study is conducted to validate the proposed method and evaluate the influence of different parameters on the structural behavior of buried pipelines. The research findings can provide an efficient and safe design solution.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Sama Safarloo, Siamak Serajzadeh
Summary: The study simulated cavitation during creep in AA7075-T76 using a probabilistic cellular automata scheme, which utilized governing equations for cavity growth and two-dimensional cellular automata. Uni-axial creep experiments were conducted under different temperatures and stresses, with microstructural changes and cavity formation evaluated. The results showed a reasonable agreement between simulation and experimental data, indicating the proposed model's validity under real conditions.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Geochemistry & Geophysics
S. L. Antoine, Y. Klinger, A. Delorme, R. D. Gold
Summary: Observations of recent earthquake surface ruptures reveal that ground deformations consist of localized fault displacements and off-fault deformations affecting the surrounding medium. High-resolution optical image correlation is used in this study to measure surface displacement fields. The results show that in regions with complex fault geometries, off-fault deformations play a significant role, while in regions with simple fault geometries, surface deformation is entirely accommodated by fault displacements. The total surface displacement remains constant along the strike of the rupture, despite variations in rupture geometry.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Jiuyuan Yang, Caijun Xu, Yangmao Wen
Summary: The Menyuan earthquake on January 7, 2022 in northeastern Tibet provided insights into the regional seismogenic structure and rupture behavior. Analysis of the coseismic and postseismic deformation revealed the activation of two strike-slip faults and the presence of significant aftershocks. By combining inversion analysis, fault kinematics, and historical earthquakes, it was found that fault branches and low pre-stress play a role in controlling the maximum rupture size of the Menyuan event.
Article
Chemistry, Physical
Tengfei Jing, Huaibei Zheng, Qi Liao, Lingxi Song, Qixuan Guo, Huabei Peng, Yuhua Wen
Summary: The addition of Si and reduction of Ni content in the CrCoNiSi medium-entropy alloy promote the occurrence of mechanical twinning at room temperature, resulting in a higher strain hardening rate and delayed necking. Tensile deformation introduces a large amount of thinner mechanical nanotwins into the CrCoNiSi alloy, which can be retained after annealing. The strength and ductility of the nanostructured CrCoNiSi alloy is increased by 26% compared to the nanostructured CrCoNi alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Polymer Science
Junfeng Hu, Xi Deng, Xutong Zhang, Wen-Xue Wang, Terutake Matsubara
Summary: The study investigated the effect of off-axis ply on the tensile properties of unbalanced symmetric [0/theta](ns) laminates through experimental and numerical analysis. The results showed that the plies with different off-axis angles exhibited approximate linear stress-strain responses in tensile tests, with no matrix cracks observed in the off-axis layers within the range of 15-60 degrees prior to final catastrophic failure. Finite element analysis using a 3D micromechanical model was conducted to predict the influence of matrix cracks inside the off-axis layer on the damage behavior of the laminates.
Article
Geochemistry & Geophysics
Axel Periollat, Mathilde Radiguet, Jerome Weiss, Cedric Twardzik, David Amitrano, Nathalie Cotte, Lou Marill, Anne Socquet
Summary: In this study, the authors analyze GPS data to investigate the deformation following the Tohoku-Oki megathrust earthquake. They find that the early stage of the postseismic phase is mainly influenced by afterslip and transient brittle creep mechanisms. The study highlights the importance of understanding the role of different mechanisms in deciphering the complexities of postseismic deformation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Harriet Zoe Yin, Xiaohua Xu, Jennifer S. Haase, Roby Douilly, David T. Sandwell, Bernard Mercier de Lepinay
Summary: Earthquakes in Haiti, such as the 2010 Mw 7.0 earthquake and the recent 2021 Mw 7.2 earthquake, pose a major threat to the region. The Enriquillo-Plantain Garden fault zone (EPGFZ) is a significant source of seismic hazard in the southern peninsula of Haiti. This study used satellite-based Interferometric Synthetic Aperture Radar (InSAR) data to analyze the ground deformation patterns associated with the 2021 earthquake, revealing the broad coseismic deformation field, detailed secondary fault structures, and postseismic shallow slip along the unruptured section of the EPGF.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2023)
Article
Engineering, Geological
Sinan Akkar, N. Merve Caglar, Ozkan Kale, Ufuk Yazgan, M. Abdullah Sandikkaya
Summary: The significance of rupture-plane uncertainty in estimated ground-motion intensity measures depends on the modeling complexity of the ground-motion predictive model and the spatial location of the site relative to the ruptured fault. Rupture-plane geometry affects predictor parameters in ground-motion models, increasing the potential impact of rupture-plane uncertainty on estimated ground-motion intensity measures, particularly with more complex models.
BULLETIN OF EARTHQUAKE ENGINEERING
(2021)
Article
Geochemistry & Geophysics
L. P. O. Mendoza, A. Richter, E. R. Marderwald, J. L. Hormaechea, G. Connon, M. Scheinert, R. Dietrich, R. A. Perdomo
Summary: This study integrates geodetic, geological, and seismological observations to quantitatively analyze the current crustal deformation associated with the Magallanes-Fagnano Fault. The results indicate a seismogenic layer thickness of around 15 km and fault planes inclined around 63 degrees, dipping to the South. The earthquake moment deficit rate along the fault in the island suggests a seismic moment equivalent to a magnitude 7 earthquake, with long-term postseismic relaxation extending over a large region.
Article
Energy & Fuels
Pingping Li, Ting Li, Huayao Zou, Gang Zhou, Liang Xu, Xinya Yu
Summary: Through cracking experiments and analysis of reservoir samples, it was found that bitumen content is positively correlated with paleoporosity and can be used as a standard for identifying paleo-oil reservoirs. Samples with lower porosity are more susceptible to bitumen filling, therefore the heterogeneous distribution should be carefully considered in gas reservoir evaluation.
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
(2022)
Article
Multidisciplinary Sciences
J. Jara-Munoz, D. Melnick, S. Li, A. Socquet, J. Cortes-Aranda, D. Brill, M. R. Strecker
Summary: The first step in assessing hazards in seismically active areas is to map possible faults and estimate their recurrence times. This study focuses on the Pichilemu Fault in coastal Chile, which was unknown until it caused a magnitude 7.0 earthquake in 2010. By analyzing off-fault deformed marine terraces, researchers estimated the fault-slip rate and recurrence time, providing valuable insights for assessing the seismic potential of hidden faults.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
H. O. Ghaffari, W. A. Griffith, T. J. Barber
GEOPHYSICAL JOURNAL INTERNATIONAL
(2019)
Article
Geochemistry & Geophysics
V Rubino, A. J. Rosakis, N. Lapusta
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2020)
Article
Multidisciplinary Sciences
Yuval Tal, Vito Rubino, Ares J. Rosakis, Nadia Lapusta
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2020)
Article
Geochemistry & Geophysics
R. K. Pearce, A. Sanchez de la Muela, M. Moorkamp, J. O. S. Hammond, T. M. Mitchell, J. Cembrano, J. Araya Vargas, P. G. Meredith, P. Iturrieta, N. Perez-Estay, N. R. Marshall, J. Smith, G. Yanez, W. Ashley Griffith, C. Marquardt, A. Stanton-Yonge, R. Nunez
Article
Multidisciplinary Sciences
Ahmed Elbanna, Mohamed Abdelmeguid, Xiao Ma, Faisal Amlani, Harsha S. Bhat, Costas Synolakis, Ares J. Rosakis
Summary: Research has shown that ground motions due to strike-slip earthquakes can contribute to the generation of large tsunamis under certain conditions. Supershear ruptures propagating along strike-slip faults, traversing narrow and shallow bays, are prime candidates for tsunami generation. The characteristic dynamic focusing and large horizontal displacements of strike-slip earthquakes are critical drivers for tsunami hazard.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Engineering, Mechanical
Kaiwen Xia, J. Ares Rosakis
Summary: The study investigates the effect of Low Velocity Zone (LVZ) on faulting using a laboratory fault model. Results show that the thickness of LVZ and the load level can affect the rupture speed and mode of the fault.
EXTREME MECHANICS LETTERS
(2021)
Article
Geochemistry & Geophysics
Michael J. Braunagel, W. Ashley Griffith
Summary: Fracture initiation and growth in rocks is a complex process that is influenced by grain-scale heterogeneity and changing stress states under dynamic loading conditions. Both crystalline and granular rocks exhibit similar fracture behaviors as engineered materials, such as rate-dependent fracture initiation toughness and a relationship between propagation toughness and crack velocity. However, the measured propagation toughness in rocks is higher than quasi-static values at lower crack velocities. Additionally, mixed mode crack propagation is fundamentally different between granite and sandstone due to grain scale controls on the fracture process.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Danika F. Mayback, Michael J. Braunagel, David H. Malone, W. Ashley Griffith, McKenna E. Holliday, Tiffany A. Rivera, Robert F. Biek, David B. Hacker, Peter D. Rowley
Summary: The formation and evolution of the basal layer in large landslides has important implications for reducing frictional resistance to sliding. This study investigates the basal layer of the Markagunt gravity slide in Utah, USA, using zircon geochronology and tectonic provenance. The results show that the basal material primarily comes from the breakdown of upper plate lithologies during sliding, and decapitated injectites have a different composition and come from a structurally deeper portion of the slide surface.
Article
Geochemistry & Geophysics
Yuval Tal, Vito Rubino, Ares J. Rosakis, Nadia Lapusta
Summary: This study investigates how the asymmetric geometry of thrust faults affects earthquake dynamics, with experimental results showing asymmetries in motion velocities between the hanging and footwalls. Surface velocity attenuation is found to be larger at the hanging wall, with experimental measurements consistent with numerical simulations and field observations. The findings suggest that the interaction of ruptures with the free surface leads to reduced normal stress near the surface in thrust earthquakes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Hongyu Zeng, Shengji Wei, Ares Rosakis
Summary: This study investigates the impact of source-side 3D velocity structure on teleseismic travel-time in back projection analysis of large earthquakes. Travel-time data recorded by the Hi-Net array is used to reveal how travel-time errors vary with source location. The study proposes a new interpolation scheme to calibrate the travel-time error by using earthquakes located around the mainshock rupture, and validates it through relocating inland M > 5.0 earthquakes in central Japan. The calibrated back projection result is then applied to image the rupture of the 2002 Denali earthquake, revealing useful information about the rupture process.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Zachary D. Smith, W. Ashley Griffith
Summary: This study investigates the development of off-fault damage through successive tensile loading. The results show that fracture density increases during each earthquake cycle, and pulverized rock can be produced at low strain rates.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Michael J. Braunagel, W. Ashley Griffith, Robert F. Biek, David B. Hacker, Peter D. Rowley, David H. Malone, Danika Mayback, Tiffany A. Rivera, Zachary Loffer, Zachary D. Smith
Summary: This study conducted field observations and microstructural characterization of the Sevier gravity slide to better understand the physical processes and controls on runout distance. The findings suggest rapid emplacement during a single event, involving mobilization and pressurized injection of basal material. Evidence of slip delocalization and variations in basal zone characteristics and slide geometry were observed, indicating the presence of highly pressurized fluids and the importance of basal zone evolution in dynamic weakening mechanisms.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Multidisciplinary Sciences
Marcello Gori, Vito Rubino, Ares J. Rosakis, Nadia Lapusta
Summary: This study reveals that fast fluid injection rates lead to dynamic ruptures at lower pressure levels and smaller spatial scales, while slow injection rates result in gradual nucleation processes consistent with accelerating slow slip behaviors. The presence of fluids influences friction properties and pore-pressure increase rate needs to be considered in nucleation processes.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Geochemistry & Geophysics
E. Pan, W. A. Griffith, H. Liu
GEODESY AND GEODYNAMICS
(2019)
Article
Environmental Sciences
Samantha C. Carter, Elizabeth M. Griffith, Theresa A. Jorgensen, Karin G. Coifman, W. Ashley Griffith
Summary: A survey of students in a diverse southwestern US college showed that students are less interested in outdoor work in geosciences, and instead prioritize altruistic factors such as helping others or the environment. Female respondents prioritize these factors more than male respondents, and many students have little knowledge about geoscience careers.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)