Article
Geosciences, Multidisciplinary
Huizi Jian, Ting Yang, Zhihao Chen, Lingling Ye, Jiashun Hu, Peng Guo
Summary: The study shows that slab pull from the Ryukyu Trench can transmit through the weakened Philippine Sea Plate and drive the advance of the Izu-Bonin Trench without the need for extreme rheological parameters. This research is of great importance for understanding subduction dynamics, lithospheric deformation mechanisms, and slab rheology.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Environmental Sciences
Xiaoming Xu, Dazhou Zhang, Xiang Huang, Xiaoman Cao
Summary: This study investigates the deformation characteristics of the crust and upper mantle in the North China Craton (NCC) using a linear damped least squares method. The results reveal good agreement between the observed anomalies of Rayleigh wave phase velocity and azimuthal anisotropy and the tectonic domains in the study area. The study suggests that the subduction of the Paleo-Pacific plate and eastward material escape of the Tibetan plateau are the main contributors to the deformation of the NCC.
Article
Geology
Victor Corchete
Summary: A new 3D S-velocity model for the crust and upper mantle beneath the Yellow Sea, the East China Sea, the Japan Sea, and the Philippine Sea has been determined, revealing the prominent features of the earth structure in this region. The S-velocity values are influenced by factors such as crustal thickness, oceanic structure, and lithosphere thickness at different depth ranges.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Motoko Ishise, Aitaro Kato, Shin'ichi Sakai, Shigeki Nakagawa, Naoshi Hirata
Summary: Research on the seismic structure beneath the Tokyo metropolitan area has revealed complex tectonic features, including an old accretionary zone and bending-related faults within the subducting Philippine Sea slab. By analyzing seismic data, low-velocity anomalies within the mantle and the anisotropy directions of the slab have been identified, providing insights into the seismic activity characteristics of the region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Huang Xiang, Ding ZhiFeng, Ning JieYuan, Chang LiJun
Summary: The study obtained the phase velocity and azimuthal anisotropy of Rayleigh wave in the central North China Craton through ambient noise tomography, revealing that surface structures play a major role in short period anomalies, with basins showing low velocity anomalies and orogenic belts exhibiting high velocity anomalies. Significant differences were observed in phase velocity anomalies and azimuthal anisotropy between the northern and southern segments of the Shanxi Rift, potentially related to magmatism in the area. The crustal azimuthal anisotropy is influenced by crustal stress fields, with the northern segment also affected by magmatism.
CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
(2021)
Article
Geosciences, Multidisciplinary
Jinping Liu, Sanzhong Li, Xianzhi Cao, Hao Dong, Yanhui Suo, Zhaoxia Jiang, Jie Zhou, Xiyao Li, Ruixin Zhang, Lijun Liu, Gillian Rose Foulger
Summary: Insight into the evolution of Philippine Sea-South China Sea (SCS) plate motions and their driving mechanisms are presented based on recent geological and seismic data. A new plate reconstruction model suggests a sinistral strike-slip fault at the western boundary of the Philippine Sea Plate with a clockwise self-rotation. The connection between the SCS and Shikoku Ridges possibly originated at 30 Ma, indicating an affinitive origin and magma source. Geodynamic simulations indicate that the seismic high-velocity body under the SCS is likely the leading edge of the Pacific Slab.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Zongjie Li, Li-Yun Fu, Jun Liu, Zhiwei Wang, Shikai Jian
Summary: This study focuses on the deep Ordovician fractured carbonates in northwest China, utilizing an integrated scheme with azimuthal P-P amplitude/frequency attributes for prestack prediction of fractures from migrated CRP gathers. The method proves effective in detecting superdeep fracture sets from seismic data with extremely low SNR, showcasing the applicability of coupled amplitude and frequency attributes for fracture prediction.
MARINE AND PETROLEUM GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Kai Wang, Shucheng Wu, Ping Tong
Summary: By constructing a new depth-dependent Vp model, this study investigates the crustal deformation in the Sierra Nevada and Walker Lane. The results reveal that the Sierra Nevada is mainly influenced by past subduction processes, while the Walker Lane is affected by present-day compression and shear deformation regimes.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Nozomu Takeuchi, Takehi Isse, Hitoshi Kawakatsu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Hisashi Utada, Tomoaki Yamada
Summary: We analyze active and passive seismic observations to study the olivine fabrics in the oceanic lithosphere. By analyzing active-source data and teleseismic Pn waves, we observe a skewed azimuthal dependence of the Pn velocity with a large peak-to-peak amplitude of about 12%, which is explained by the direction of crystallographic axes of A-type olivine. In contrast, D-type olivine cannot explain the observations. This study suggests that secondary deformation and recrystallization in the older Pacific may be responsible for the complex seismic anisotropy in the study region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Geochemistry & Geophysics
Mohsen A. A. Irandoust, Keith Priestley, Farhad Sobouti
Summary: By analyzing seismic wave data, we have developed a high-resolution 3D shear-wave velocity model for the crust and uppermost mantle of the Iranian Plateau. The model reveals the spatial distribution of crust thickness and deformation, and identifies geological features such as thick and thin crust regions, as well as underthrusting phenomena.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geosciences, Multidisciplinary
Walid Ben-Mansour, Douglas A. Wiens, Hannah F. Mark, Raymond M. Russo, Andreas Richter, Eric Marderwald, Sergio Barrientos
Summary: Geological processes in Southern Patagonia are influenced by the Patagonian slab window formed by the subduction of the Chile Ridge and the northward migration of the Chile Triple Junction. The study reveals the presence of a warm, low-viscosity shallow mantle channel just south of the Nazca slab, leading to fast mantle flow and the formation of a volcanic gap.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Shaolin Liu, Kai Chang, Dinghui Yang, Xiwei Xu, Wenshuai Wang, Shuxin Yang, Mengyang Li
Summary: The Dianzhong Block, located on the southeastern margin of the Tibetan Plateau, is an important tectonic zone characterized by the flow of crustal material. Through tomography analysis, the study reveals velocity anomalies and complex azimuthal anisotropy patterns in the subsurface structures. It suggests the presence of middle-lower crustal flow in the Dianzhong Block and identifies different factors controlling the deformation of the Xiaojiang Fault.
Article
Geochemistry & Geophysics
Shaoqian Hu, Huajian Yao, Hsin-Ying Yang
Summary: The study analyzed the backazimuth-dependent Rayleigh wave ellipticity in the contiguous United States, deriving a formulation relating period-dependent back-azimuthal Rayleigh wave ellipticity with depth-dependent azimuthal wave speed variation in a slightly anisotropic medium. The derived formulation provides complementary information on anisotropic parameters and can quantitatively explain the backazimuth-dependent Rayleigh wave ellipticity.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Zhiqiang Liu, Chuntao Liang, Huixuan Huang, Chaoliang Wang, Feihuang Cao
Summary: Advances in noise-based velocity change measurements have revealed anomalies before volcanic eruptions. In this study, volcanic tremor and oceanic noise were used as passive sources to calculate the Rayleigh wave velocity changes associated with the 2018 Kilauea eruption. The results showed a decrease and increase in velocity at different depths, suggesting magma intrusion and higher compressive stress in the surrounding areas.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Yan Jia, Kelly H. Liu, Fansheng Kong, Lin Liu, Stephen S. Gao
Summary: Most teleseismic XKS shear wave splitting studies are based on the assumption of spatially invariant anisotropy structure, and the observed splitting parameters exhibit different periodic or irregular variations in different scenarios. The location of recording stations, geological features, and structures have an impact on the observed splitting parameters.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)