Article
Geosciences, Multidisciplinary
Jiuyuan Yang, Caijun Xu, Yangmao Wen, Guangyu Xu
Summary: This study investigates the coseismic and postseismic deformation of three earthquakes that occurred in Thessaly, Greece, from March 3 to March 12, 2021. It reveals the activation of at least four unmapped low-angle normal faults and a ramp-flat structure by the seismic sequence. The analysis also highlights the control of slip extent and rupture termination by intersections between main and secondary faults, as well as the encouragement of rupture reinitiation of later events by static stress transfers induced by earlier events.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Michel Bouchon, Hayrullah Karabulut, Mustafa Aktar, Serdar Ozalaybey, Jean Schmittbuhl, Marie-Paule Bouin, David Marsan
Summary: The text discusses the uncertainty around the seismic activity preceding earthquakes, questioning whether it is random or indicates an impending rupture. By studying the nucleation of the Izmit and Duzce earthquakes, it is found that slow aseismic slip plays a key role in their nucleation process.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Alexander Minakov, Viktoriya Yarushina
Summary: This paper presents a mathematical model which derives the seismic moment tensor based on classical continuum mechanics and plasticity theory, providing further clarification on the relationship between microseismic events and the failure process. The representation of seismic sources in this model has several useful properties and is compatible with elasto-plastic geomechanical simulators, highlighting theoretical links between stress state, geomechanical parameters and conventional representations of the moment tensor such as Hudson source type parameters.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Thomas H. Jordan, Alan Juarez
Summary: This study investigates how the geometrical complexity in seismic energy release is governed by tectonic stress using a probabilistic model and Stress-Strain Characterization (SSC) parameters. By analyzing focal mechanism data from the San Jacinto Fault (SJF) zone and a stochastic rupture model, the study shows that the recovered parameters indicate different levels of mechanism complexity and inconsistencies with the SSC model.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Shihao Yuan, Kilian Gessele, Alice-Agnes Gabriel, Dave A. May, Joachim Wassermann, Heiner Igel
Summary: In this study, the use of back azimuth and seismic source tracking is investigated, with successful results achieved through the six degree-of-freedom measurement approach. By utilizing different wave types and data analysis methods, the rupture path and velocity can be accurately recovered.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
M. W. Herman, K. P. Furlong, H. M. Benz
Summary: This article investigates the relationship between surface faulting and subduction megathrust rupture in the 2016 Kaikoura earthquake in New Zealand. The study finds that the slip in the upper plate fault coincides with the megathrust rupture, and this extreme faulting is a result of increased Coulomb stress and basal decoupling.
Article
Geochemistry & Geophysics
M. W. Herman, K. P. Furlong, H. M. Benz
Summary: The 2016 Kaikoura earthquake in New Zealand occurred in the southern end of the Hikurangi subduction zone. This earthquake caused substantial deformation in the upper plate of the subduction zone, and the greatest fault slip in the upper plate coincided with the megathrust rupture. The combination of increased Coulomb stress and basal decoupling resulted in the extreme co-seismic upper plate faulting observed in this earthquake.
Article
Geochemistry & Geophysics
Ittai Kurzon, Vladimir Lyakhovsky, Amir Sagy, Yehuda Ben-Zion
Summary: This study presents results on radiated seismic energy during simulations of dynamic ruptures, incorporating the evolution of damage within the seismic source region. The simulations vary in their initial damage zone width and rate of damage diffusion, and the results show that the damage process produces an additional burst of energy mainly in the P waves at high frequencies. The study also highlights the significance of the dilatational motion during rupture and its impact on the radiation pattern.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Astronomy & Astrophysics
Robert Granat, Andrea Donnellan, Michael Heflin, Gregory Lyzenga, Margaret Glasscoe, Jay Parker, Marlon Pierce, Jun Wang, John Rundle, Lisa G. Ludwig
Summary: The data-driven approach presented in this study allows clustering of GNSS stations based on observed velocities, displacements, or other selected characteristics. The method provides valuable scientific information and is essential for further analysis. By selecting desired features of the data for clustering, the stations can be autonomously grouped using a selected clustering method.
EARTH AND SPACE SCIENCE
(2021)
Article
Geography, Physical
J. Robertson, G. P. Roberts, A. Ganas, M. Meschis, D. M. Gheorghiu, R. P. Shanks
Summary: This study conducts spatio-temporal analysis on Pleistocene palaeoshorelines in southwestern Crete. By using Cl-36 exposure dating on wave-cut platforms and mapping of palaeoshorelines, it is found that the Late Quaternary uplift rates increase from west to east, suggesting that an offshore extensional fault may also contribute to the uplift.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Elif Oral, Claudio Satriano
Summary: The eastern offshore of Martinique is an active region of the Lesser Antilles Subduction Zone capable of generating strong earthquakes. Factors such as fault geometry and slip patch spatial extension were found to be influential in ground motion variation, with the selection of empirical Green's functions impacting the modelled ground motion. This study provides insights for seismic source impact on ground motion in Martinique and can guide future seismic hazard assessment studies.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yoshiki Yamazaki, Thorne Lay, Kwok Fai Cheung
Summary: The 1975 Kalapana earthquake in Hawaii triggered a local tsunami with a runup of at least 14.3 m, involving coastal landsliding and offshore fault mechanisms. Diverse observations were utilized to deduce a compound faulting model that clarifies the tsunami hazards for the Hawaiian Islands.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Ittai Kurzon, Vladimir Lyakhovsky, Yehuda Ben-Zion
Summary: The study focuses on earthquake source properties by simulating dynamic rupture and radiated seismic waves. Source parameters are calculated directly from simulated sources and processed from observational far-field waves. Rupture velocity and dominant frequency play crucial roles in earthquake source characterization.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Jian Wen, Jiankuan Xu, Xiaofei Chen
Summary: The paper investigates the stress drop as an important dynamic source parameter for understanding the physics of source processes. By simulating spontaneous dynamic ruptures using a boundary integral equation method, it was found that there are different scaling relationships between corner frequency, seismic moment, and source dynamic parameters for runaway ruptures and self-arresting ruptures.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Environmental Sciences
Zhicai Li, Jianfei Zang, Shijie Fan, Yangmao Wen, Caijun Xu, Fei Yang, Xiuying Peng, Lijiang Zhao, Xing Zhou
Summary: This study validates the use of the high-rate global navigation satellite system (GNSS) for real-time source modeling of the 2022 Menyuan earthquake in China. The results indicate that the stability of the inverted centroid moment tensor (CMT) and fault slips can be improved by using the coseismic offsets averaged by a relatively long-time sliding window.