Article
Geochemistry & Geophysics
Xiaodong Yang, Qiang Qiu, Wanpeng Feng, Jian Lin, Jinchang Zhang, Zhiyuan Zhou, Fan Zhang
Summary: The Makran subduction zone is an active area with uncertain earthquake and tsunami characteristics. By studying the characteristics of a recent earthquake in 2017, we have identified some key features and suggested the possibility of future earthquakes.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Toshiko Terakawa, Mitsuhiro Matsu'ura
Summary: We developed an inversion method to estimate 3-D tectonic stress fields using centroid moment tensor (CMT) data from seismic events. The analysis of 24 years of data in northeast Japan revealed that the tectonic stress orientation was stable for 14 years before the 2011 megathrust event. However, there is a possibility of significant changes in tectonic stress orientation in the post-seismic period. The evaluation results indicate that the stress orientation change in the region off Fukushima and Ibaraki is real.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Kodai Sagae, Hisashi Nakahara, Takeshi Nishimura, Kazutoshi Imanishi
Summary: This study detected and located deep low-frequency tremors beneath the Kii Peninsula, Nankai subduction zone, Japan, using data from a dense seismic array. The high-resolution tremor catalogue revealed various characteristics of tremor activity, including continuous updip migration and different migration speeds depending on along-strike migration. The results also suggest a depth dependence of frictional strength on the plate interface and a positive correlation between accumulated radiated energies and updip migration speed, implying a potential role of fluid migration in the updip migration process.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
S. Baize, S. Amoroso, N. Belic, L. Benedetti, P. Boncio, M. Budic, F. R. Cinti, M. Henriquet, P. Jamsek Rupnik, B. Kordic, S. Markusic, L. Minarelli, D. Pantosti, S. Pucci, M. Spelic, A. Testa, S. Valkaniotis, M. Vukovski, J. Atanackov, J. Barbaca, M. Bavec, R. Brajkovic, V Brcic, M. Caciagli, B. Celarc, R. Civico, P. M. De Martini, R. Filjak, F. Iezzi, A. Moulin, T. Kurecic, M. Metois, R. Nappi, A. Novak, M. Novak, B. Pace, D. Palenik, T. Ricci
Summary: On 29 December 2020, a shallow earthquake of magnitude M-w 6.4 struck northern Croatia, causing significant coseismic environmental effects such as surface deformation, liquefaction, and slope failures. The surface rupture, named the Petrinja-Pokupsko Fault, is discontinuous and shows evidence of slip on a right lateral fault. Liquefaction extends over an area of nearly 600 km(2) around the epicentre. The environmental effects of the earthquake are consistent with the usual scaling relationships.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Roland Freisleben, Julius Jara-Munoz, Daniel Melnick, Diego Molina, Andres Tassara, Peter van der Beek, Manfred R. Strecker
Summary: This study investigates the mechanisms driving permanent coastal uplift in the tectonically active South American margin. By analyzing uplifted marine terraces and tectonic parameters, the researchers identify a constant background-uplift rate along the margin, perturbed by changes at variable wavelengths. The study suggests that major, deep earthquakes near the Moho are responsible for the moderate, long-term background uplift, while accumulation of permanent deformation over millennial time scales occurs through multiple, distinct uplift phases. The findings highlight the utility of a signal-analysis approach in understanding surface deformation in subduction zones at a continental scale.
Article
Geochemistry & Geophysics
Koichiro Obana, Gou Fujie, Yojiro Yamamoto, Yuka Kaiho, Yasuyuki Nakamura, Seiichi Miura, Shuichi Kodaira
Summary: The study investigated aftershock activities in the southern Japan Trench and found linear earthquake trends parallel and oblique to the trench axis. In the trench landward area, earthquake activity showed variations along the trench, with shallow near-trench regular earthquakes observed near the trench axis. The study also suggested that smaller spatial scale structure heterogeneity could relate to the diversity of slip behaviors in the shallow subduction zone.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yijun Zhang, Han Bao, Yosuke Aoki, Akinori Hashima
Summary: We constructed an integrated rupture model of the 2021 M-w 7.1 Fukushima earthquake and analyzed its kinematic rupture, slip distribution, and stress changes. The study found that the rupture propagated along both the strike and dip directions, with a large-slip area located southwest to the hypocentre. The temporal change of stress suggested that the occurrence of the Fukushima earthquake may have been promoted by the post-seismic deformation due to the 2011 Tohoku-Oki earthquake.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Aisling O'Kane, Alex Copley
Summary: Rapid urban growth has increased population density in foreland basins, leading to higher earthquake risk. Seismic wave propagation in these areas is mainly controlled by source depth and basin structure. Matching basin depth with dominant wavelength results in maximum ground motion.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
Yanfang Qin, Yasuyuki Nakamura, Shuichi Kodaira, Gou Fujie
Summary: This study collected seismic data from different regions along the Japan trench during the 2011 Tohoku earthquake to investigate the impact of along-trench structures on seismic activities. The study found variations in geological structures, such as differences in sediment thickness and the presence of fold-and-thrust belts in the south. These structural variations influence shallow megathrust slip and tsunami generation.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Yicun Guo, Jiancang Zhuang, Huai Zhang
Summary: This study uses a statistical model to detect earthquake swarm sequences that may be related to slow slip events (SSEs) in the Nankai subduction zone. The detected swarms are mostly located in the western part, complementing the distribution of SSEs in the region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Tomoaki Nishikawa, Takuya Nishimura
Summary: Research has found that slow slip events (SSEs) at subduction zone plate boundaries can trigger earthquake swarms and megathrust earthquakes. The current statistical models do not explicitly consider the seismicity-triggering effect of SSEs, resulting in failed earthquake predictions. In this study, a new statistical model named the SSE-modulated ETAS model was constructed by incorporating SSE moment rates into the original ETAS model. Application of this new model to SSEs and M 2.5 or greater earthquakes in the Hikurangi Trench, New Zealand showed significant improvement compared to the original model.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
D. Legrand, A. Iglesias, S. K. Singh, V Cruz-Atienza, C. Yoon, L. A. Dominguez, R. W. Valenzuela, G. Suarez, O. Castro-Artola
Summary: The rate of aftershocks is high in the Ometepec segment of the Mexican subduction zone, likely due to the presence of overpressured fluids and a rough plate interface. This is characterized by a high b-value and slow decaying aftershock sequence.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
S. X. Chu, G. C. Beroza
Summary: The study finds that productive aftershock sequences of intermediate-depth earthquakes behave similarly to those of crustal earthquakes and tend to appear mainly in the Pacific Plate, where they are significantly correlated with along-strike variations in V-P-V-S ratio, suggesting a role for fluids in enabling intermediate-depth aftershock activity.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Caroline Mouchon, William B. B. Frank, Mathilde Radiguet, Piero Poli, Nathalie Cotte
Summary: Geodetic positioning is the reference for slow slip events, but daily solutions limit studies. Low-frequency earthquakes can provide a high-resolution time history of slow slip dynamics. The ratio of geodetic to seismic fault slip varies with time, suggesting the saturation of the earthquake source region as slow slip grows.
Article
Geochemistry & Geophysics
Yi Ren, Vaclav Vavrycuk, Li Zhao
Summary: This study presents the shear-tensile-compressive (STC) model as an alternative to the moment tensor (MT) model for earthquake sources, and validates its accuracy and robustness in source mechanism inversion through synthetic experiments and real data analysis.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)