Article
Geochemistry & Geophysics
Kristina K. Okamoto, Heather M. Savage, Elizabeth S. Cochran, Katie M. Keranen
Summary: The interaction between aseismic and seismic slip is crucial for understanding earthquake processes. However, detecting aseismic slip locations and timing has been challenging. By studying repeating earthquakes in the 2011 Prague earthquake sequence, it was found that aseismic slip mainly occurs at fault intersections, which also coincide with mainshock slip, aftershocks, and afterslip.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Pepen Supendi, Tom Winder, Nicholas Rawlinson, Conor Andrew Bacon, Kadek Hendrawan Palgunadi, Andrean Simanjuntak, Andri Kurniawan, Sri Widiyantoro, Andri Dian Nugraha, Hasbi Ash Shiddiqi, Dwikorita Ardianto, Daryono, Suko Prayitno Adi, Dwikorita Karnawati, Jajat Priyobudi, Gayatri Indah Marliyani, Iswandi Imranj, Jajat Jatnika
Summary: This study investigates the source mechanism and aftershock distribution of a destructive earthquake that occurred in Cianjur, West Java, Indonesia in 2022. The results show the presence of clear foreshocks before the mainshock, as well as bilateral rupture and stress changes on nearby faults.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Lipeng He, Qimin Wu, Xiaowei Chen, Xinlei Sun, Zhen Guo, Yongshun John Chen
Summary: This study utilized tomographic inversion of seismic data recorded by a dense local seismic network to create a high-resolution 3D velocity model, which illuminated the geometry and characteristics of the Meeker-Prague Fault and proposed a conceptual model linking the tomographic structure to the triggering process of the earthquake sequence.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Geochemistry & Geophysics
Colin N. Pennington, Takahiko Uchide, Xiaowei Chen
Summary: This study investigates the control of injection, prior seismicity, and fault properties on the rupture growth and propagation of induced earthquakes. The analysis reveals that the slip distribution of the Guthrie M-w 4.0 earthquake is influenced by factors such as low pore pressure changes, static stress changes, and the initial stress distribution and fault strength. Comparisons with other strike-slip events suggest that reactivated faults exhibit different slip distributions compared to active regions, with the initial stress distribution and fault strength being the primary controlling factors. Overall, pore pressure perturbations and earthquake interactions enhance the slip distribution, but the fault's initial stress and strength state ultimately control it.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Environmental Sciences
Yun Zhou, Lisheng Xu, Zhengyang Pan, Ming Hao, Chunlai Li
Summary: We used near-field and regional GNSS data to analyze the deformation and locking ratio of the Xiaojiang fault in southeastern Tibet. The results showed that the slip rate of the fault is 9-11 mm/a, with varying locking depths in different segments. An asperity with the potential of generating a strong earthquake was identified, which is consistent with historical earthquake events. The activity of both strong historical earthquakes and recent microearthquakes suggests the possibility of an imminent earthquake.
Article
Geochemistry & Geophysics
Isabelle Panet, Clement Narteau, Jean-Michel Lemoine, Sylvain Bonvalot, Dominique Remy
Summary: In this study, we conducted a global analysis of GRACE-reconstructed gravity gradients to investigate the existence of deep signals preceding the Tohoku earthquake in 2011. Our findings demonstrate the presence of a unique solid Earth signal, which is independent of oceanic corrections, and can be utilized for continuous monitoring of the Pacific subduction belt.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Longjun Dong, Qiaomu Luo
Summary: This work reviews the experimental study of fault slip and its relation to earthquakes, discussing the physical processes and mechanisms involved. The main influencing factors in the study of fault and earthquake are stress, velocity, material, fluid, and temperature. These studies have the potential to advance the understanding of earthquake mechanisms and guide earthquake prediction and control.
EARTH-SCIENCE REVIEWS
(2022)
Article
Environmental Sciences
Jiuyuan Yang, Caijun Xu, Yangmao Wen
Summary: On January 23 and March 25, 2022, two right-lateral strike-slip earthquakes with magnitudes larger than 5.5 occurred near Hala Lake in northeastern Tibet. These two events are the largest since the 1927 Hala Lake earthquake. The lack of surface rupture makes it difficult to determine the seismogenic faults and coseismic rupture behaviors of the two events. However, studying these events can provide valuable insights into the seismic hazard of the region.
Article
Geosciences, Multidisciplinary
L. Jiao, Y. Klinger, L. Scholtes
Summary: Through numerical modeling, this study demonstrates that during shearing of a layer of brittle material, oblique Riedel fractures nucleate with a regular spacing controlled by the layer's thickness, which then influences the spatial structuration of the entire fault system. An analysis of horizontal stress distribution reveals a threshold at a ratio of 1.5 between inter-Riedel distance and material thickness, beyond which new fractures nucleate due to a switch from compressional to tensional stress.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Han Chen, Chunyan Qu, Dezheng Zhao, Chao Ma, Xinjian Shan
Summary: The 21 May 2021 Maduo earthquake is the largest event that occurred on a secondary fault within the Bayanhar block in the past twenty years. The detailed kinematic study of this earthquake provides insight into the seismogenic environments of secondary faults within the block and their relationship with block-bounding faults. The study shows a highly correlated distribution of coseismic slip on the fault with measured surface displacement offsets, indicating the importance of the earthquake for updating the seismic hazards estimate for the Kunlun fault.
Article
Environmental Sciences
Yujiang Li, Yongsheng Li, Xingping Hu, Haoqing Liu
Summary: This study analyzed the focal mechanism solutions and regional tectonic stress distribution of the Nakchu earthquake using InSAR processing, revealing that the dominant normal faulting occurred due to the influence of historical major earthquakes. These results provide important theoretical support for understanding the geometry and mechanics of the seismogenic fault that produced the Nakchu earthquake.
Article
Geosciences, Multidisciplinary
Zhaode Yuan, Tao Li, Peng Su, Haoyue Sun, Guanghao Ha, Peng Guo, Guihua Chen, Jessica Thompson Jobe
Summary: Based on field investigations, high-resolution UAV images, and InSAR data analysis, this study mapped the fault geometry and surface ruptures of the 2021 M-w 7.4 Maduo earthquake. The results showed that the earthquake activated a fault with complicated structural geometry, and the surface rupture spanned 148 km, divided into three distinct segments by two large gaps.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Olivia Leigh Walbert, Eric Andreas Hetland
Summary: In this study, a Bayesian Markov chain Monte Carlo estimation strategy was used to infer the pre-earthquake stress state from eight published coseismic slip models of the 2016 Kaikoura earthquake. The findings showed that the earthquake can be described by a homogeneous stress state, despite the complex slip pattern. Additionally, a composite posterior probability density function was used to evaluate the mechanical consistency of the slip models and resolve differences in inferred slip.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2022)
Article
Geosciences, Multidisciplinary
Emmanuel Caballero, Agnes Chounet, Zacharie Duputel, Jorge Jara, Cedric Twardzik, Romain Jolivet
Summary: Transient deformation associated with foreshock activity can indicate detectable preseismic slow slip before large earthquakes. Research on the Valparaiso earthquake sequence suggests a significant contribution of aseismic pre-slip during the initiation phase preceding the mainshock. Comparisons between observed and predicted displacements show that only half of the total displacement can be explained by the contribution of foreshocks.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Hao Lu, Guangcai Feng, Lijia He, Jihong Liu, Hua Gao, Yuedong Wang, Xiongxiao Wu, Yuexin Wang, Qi An, Yingang Zhao
Summary: This study derived the coseismic displacements of an earthquake in Yangbi County using Sentinel-1 data, and inverted the source model of the event. The results showed that adding the BOI-derived displacements improved the resolution of the slip model and revealed potential seismic risks.
