Article
Geochemistry & Geophysics
Kohtaro Ujiie, Keisuke Ito, Ayaka Nagate, Hiroki Tabata
Summary: The study of pseudotachylyte in a Jurassic chert-clastic complex in central Japan reveals key characteristics of seismic slip in deeper portions of subduction zones, suggesting that slip is localized along black carbonaceous mudstone. Intensely fractured wall rocks may influence the generation of frictional melt and acceleration of seismic slip.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Review
Environmental Sciences
James D. Kirkpatrick, Ake Fagereng, David R. Shelly
Summary: The recognition of slow earthquakes has transformed the understanding of plate motion mechanisms, but the mechanics behind slow earthquakes remain enigmatic. Geoscientists have synthesized geological observations of ancient deformation structures to gain insights into fault slip mechanics.
NATURE REVIEWS EARTH & ENVIRONMENT
(2021)
Article
Geosciences, Multidisciplinary
K. Chaudhuri, A. Ghosh
Summary: This study reveals the occurrence of slow earthquakes, including tremors and low-frequency earthquakes, in the south-central range of Taiwan. Using a grid-search moment tensor inversion algorithm, very low frequency earthquakes (VLFEs) have been detected and a robust VLFE catalog for 3 years has been created. The study shows that there is a significant increase in VLFE activities preceding earthquake swarms and a correlation between VLFEs and fast earthquakes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Kristijan Rajic, Hugues Raimbourg, Vincent Famin, Benjamin Moris-Muttoni, Donald M. Fisher, Kristin D. Morell, Aurelien Canizares
Summary: We conducted a structural study on the Kodiak accretionary complex in Alaska, USA to understand its thermal structure and the processes of exhumation. The complex consists of tectonic melanges and coherent units, with melanges characterized by shear deformation and coherent units affected by horizontal shortening. Our findings indicate peak temperatures ranging from 220 to 400 degrees C, with the highest temperatures recorded in the central part of the complex. Based on structural and thermal data, we conclude that the rocks in the Kodiak complex experienced stages of burial and exhumation, with vertical motions reaching up to 13 km. The exhumation resulted from prism thickening and surficial erosion.
Article
Geochemistry & Geophysics
Kristijan Rajic, Hugues Raimbourg, Vincent Famin, Benjamin Moris-Muttoni, Donald M. Fisher, Kristin D. Morell, Aurelien Canizares
Summary: A study on the structural and thermal characteristics of the Kodiak accretionary complex in Alaska, USA suggests that the complex experienced two stages of burial and exhumation. The study also reveals a dome-like structure in the central part of the complex and records subsidence episodes along the southeastern border. The rates of vertical motion in the complex are comparable to estimates in modern margins.
Article
Geosciences, Multidisciplinary
Riho Fujioka, Ikuo Katayama, Manami Kitamura, Hanaya Okuda, Takehiro Hirose
Summary: We conducted frictional experiments on cuttings collected at Nankai Trough IODP Site C0002 to investigate the frictional properties in the accretionary prism. We found that the friction coefficient increased slightly with depth, indicating a velocity-strengthening behavior. However, a slight decreasing trend in the velocity dependence suggests a possible transition to velocity-weakening behavior at greater depths.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2022)
Article
Geosciences, Multidisciplinary
Kuntal Chaudhuri, Abhijit Ghosh
Summary: Using ocean-bottom seismometers, we have discovered widespread occurrence of discrete very low-frequency earthquakes (VLFEs) offshore Cascadia. The VLFEs in the northern part of Cascadia have focal mechanisms consistent with subduction zone deformation. In the southern part, the VLFEs show characteristics of strike-slip faulting, possibly due to complex plate tectonics.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
C. G. Sammis, M. G. Bostock
Summary: The study analyzes a catalog of low frequency events beneath Vancouver Island in the context of a granular flow model. It finds that the LFEs do not follow Gutenberg-Richter statistics, but are normally distributed with respect to magnitude, and log-normally distributed with respect to moment. The model suggests that LFE families correspond to granular jams in flow that persist over multiple ETS episodes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geosciences, Multidisciplinary
Randolph T. Williams, James D. Kirkpatrick
Summary: This study examines the variability in slip per inferred low-frequency earthquake (LFE) and tests different hypotheses regarding the controls on LFE moments. By analyzing the geometry of slickenfibers, the study finds characteristic slip increments and supports a slip-limited model with large variability in LFE rupture areas.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Jing Liao, Xinxin Liu, Qingfang Zhao, Jianming Gong, Weihan Yin, Sen Li, Baohua Lei, Jie Liang, Khalid Muhammad, Waseem Haider Syed
Summary: In this study, seismic data interpretation and impedance inversion were conducted to delineate the spatial distribution of high saturation gas hydrate reservoirs in the low-angle subduction areas of the Makran Accretionary Prism. The characteristics of high saturation gas hydrate reservoirs in the Nankai Trough in Japan and the Shenhu Area in the South China Sea were comprehensively analyzed. The results provide useful information for the exploration and development of gas hydrate in this area.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Jianchun Xu, Jinqing Cao, Menghao Guo, Shaolong Yang, Huiming Yao, Ming Lei, Yanan Hao, Ke Bi
Summary: The article discusses a compact piezoelectric metamaterial mechanical antenna with high radiation efficiency, multi-frequency bands, and small size, demonstrating three operating frequencies independently adjusted by the structure parameters and material of a piezoelectric radiating unit cell. The antenna design is based on detailed modulation mechanism studies and shows great potential for applications in portable, small, high-performance wireless communication devices.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2021)
Article
Geosciences, Multidisciplinary
Wenyuan Fan, Andrew J. Barbour, Jeffrey J. McGuire, Yihe Huang, Guoqing Lin, Elizabeth S. Cochran, Ryo Okuwaki
Summary: Megathrust earthquakes and associated tsunamis are among the most severe natural disasters. Different slip behaviors, including slow earthquakes, can occur at subduction zones. Very low frequency earthquakes (VLFEs) are particularly enigmatic and difficult to detect reliably. This study reveals the existence of VLFEs in the Cascadia region, which may have implications for seismic hazard assessment in coastal communities.
Article
Geochemistry & Geophysics
Chao Song, Allan M. Rubin
Summary: Researchers investigated tremor signals by locating windows in different frequency bands, finding that during rapid tremor migrations, low-frequency energy appears to lag behind high-frequency energy by roughly 500 meters. This suggests that tremor may consist of more than just a collection of LFEs.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Engineering, Electrical & Electronic
Jing Zhang, Yang Jiao, Qing Chen, Lei Zhou, Hongbin Li, Yue Tong
Summary: The deterioration of cable insulation is a recognized problem, and the measurement of tan delta at VLF is effective for detecting cable insulation. However, the traditional offline method requires power outage, so an advanced online method is proposed in this study, which calculates tan delta based on the measurement of artificially injected VLF voltage and VLF leakage current. The developed equipment and method were successfully applied in the China Electric Power Research Institute, and the measuring results matched the actual conditions, confirming its validity.
IEEE SENSORS JOURNAL
(2022)
Article
Geosciences, Multidisciplinary
Whitney M. Behr, Taras Gerya, Claudio Cannizzaro, Robert Blass
Summary: In this study, numerical models were used to explore the seismic slip characteristics of frictional-viscous megathrust shear zones, revealing the importance of stress heterogeneity in controlling earthquake propagation speed and slow slip transmission distance.
Article
Geosciences, Multidisciplinary
Jun Muto, Bunichiro Shibazaki, Takeshi Iinuma, Yoshihiro Ito, Yusaku Ohta, Satoshi Miura, Yoshihiko Nakai
GEOPHYSICAL RESEARCH LETTERS
(2016)
Article
Geochemistry & Geophysics
Bunichiro Shibazaki, Tomomi Okada, Jun Muto, Takumi Matsumoto, Takeyoshi Yoshida, Keisuke Yoshida
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2016)
Article
Geosciences, Multidisciplinary
Fred F. Pollitz, Tomokazu Kobayashi, Hiroshi Yarai, Bunichiro Shibazaki, Takumi Matsumoto
GEOPHYSICAL RESEARCH LETTERS
(2017)
Article
Multidisciplinary Sciences
Hiroyuki Noda, Michiyo Sawai, Bunichiro Shibazaki
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2017)
Editorial Material
Geosciences, Multidisciplinary
Yoshihisa Iio, Richard H. Sibson, Toru Takeshita, Takeshi Sagiya, Bunichiro Shibazaki, T. Junichi Nakajima
EARTH PLANETS AND SPACE
(2018)
Article
Multidisciplinary Sciences
Tetsuro Hirono, Kenichi Tsuda, Wataru Tanikawa, Jean-Paul Ampuero, Bunichiro Shibazaki, Masataka Kinoshita, James J. Mori
SCIENTIFIC REPORTS
(2016)
Article
Multidisciplinary Sciences
Ryohei Sasajima, Bunichiro Shibazaki, Hikaru Iwamori, Takuya Nishimura, Yoshihiko Nakai
SCIENTIFIC REPORTS
(2019)
Correction
Geosciences, Multidisciplinary
Yoshihisa Iio, Richard H. Sibson, Toru Takeshita, Takeshi Sagiya, Bunichiro Shibazaki, Junichi Nakajima
EARTH PLANETS AND SPACE
(2019)
Article
Geosciences, Multidisciplinary
Qibin Shi, Sylvain Barbot, Shengji Wei, Paul Tapponnier, Takanori Matsuzawa, Bunichiro Shibazaki
EARTH PLANETS AND SPACE
(2020)
Article
Geochemistry & Geophysics
Bunichiro Shibazaki, Laura M. Wallace, Yoshihiro Kaneko, Ian Hamling, Yoshihiro Ito, Takanori Matsuzawa
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
Keisuke Yoshida, Hiroyuki Noda, Masao Nakatani, Bunichiro Shibazaki
Summary: The study shows that under the influence of upward fluid invasion, seismic activity can migrate faster than predicted by conventional models. The recurrence of earthquakes and the directions of ruptures are controlled by the brittleness index.
Review
Geosciences, Multidisciplinary
Bunichiro Shibazaki
Summary: This paper summarizes 10 years of research on the earthquake cycles and crustal deformation associated with the 2011 Tohoku-oki earthquake. Several models have been proposed to explain the occurrence of megathrust earthquakes and large slips in the northeast Japan subduction zone. The study observed submarine crustal deformation and discussed the effects of the low-viscosity region and the cold nose. Simulations showed that the Tohoku-oki earthquake caused large stress fluctuations and subsidence in the Pacific coastal region.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2023)
Article
Geography, Physical
Bunichiro Shibazaki, Ryohei Sasajima
JOURNAL OF GEOGRAPHY-CHIGAKU ZASSHI
(2019)
Article
Geochemistry & Geophysics
Bunichiro Shibazaki, Hiroyuki Noda, Matt J. Ikari
PURE AND APPLIED GEOPHYSICS
(2019)
Article
Geochemistry & Geophysics
Zhang Li-Fen, Bunichiro Shibazaki, Liao Wu-Lin, Li Jing-Gang, Wang Qiu-Liang
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2016)