Article
Geochemistry & Geophysics
Yuxuan Chen, Mian Liu, Hui Wang
Summary: This study used the nearest-neighbor method to identify recent moderate earthquakes in the Tangshan region as likely aftershocks of the 1976 Great Tangshan earthquake. The background seismicity in North China was found to be relatively stable but varied over time, with higher seismic activity observed in major active tectonic zones.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
A. K. Shah, T. L. Pratt, J. W. Horton
Summary: The study employs new high-resolution aeromagnetic data, previous borehole sample information, and reprocessed seismic reflection profiles to identify faults and structures within the Charleston seismic zone and the surrounding Mesozoic South Georgia rift basin. The results reveal Paleozoic orogenic structures, Mesozoic dikes, and Mesozoic rift structures associated with faults in pre-Cretaceous strata. The analysis also suggests reactivation of Paleozoic faults and deformation in Cretaceous and younger sediments, indicating recent fault activity in the area. The findings highlight the significance of failed rift basin features in influencing intraplate seismicity.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geochemistry & Geophysics
Yuta Mitsui, Keiji Uehara, Issei Kosugi, Koji Matsuo
Summary: This study investigates the occurrence of various earthquakes and slow slip phenomena in subduction zones. It is found that regions with high background seismicity correspond to the source areas of large slow slip events, which are not associated with tectonic tremors. Furthermore, these regions also coincide with areas of low free-air gravity anomalies. This suggests that widespread stress perturbations, possibly coupled with pore fluid effects, control seismic and aseismic slip on subduction faults.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Geochemistry & Geophysics
Sergio Eduardo Barrientos, Sebastian Riquelme, C. S. N. Team
Summary: Chile imposed severe mobility restrictions in response to the COVID-19 pandemic, affecting all areas of activities including the operations of the National Seismological Centre. While there were negative impacts on station uptime, the CSN was still able to fulfill its mission of delivering timely seismic information to emergency services. The largest earthquake event in the country during this period activated new tools for finite-fault modeling within the center.
SEISMOLOGICAL RESEARCH LETTERS
(2021)
Article
Geosciences, Multidisciplinary
S. Standen, M. Dentith, D. Clark
Summary: Seismic activity in the intraplate southwest of Western Australia is not well understood, but studying geological structures can deepen the understanding of the causes of these earthquakes.
AUSTRALIAN JOURNAL OF EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Guanling Peng, Xinglin Lei, Guangming Wang, Feirui Jiang
Summary: Recent studies have shown that tidal triggering of earthquakes is more likely to occur when the crustal medium is near a critical state, and tidal stresses can be used to forecast earthquakes. Research conducted near the Gaoligong Shear Zone found statistically significant correlations between tidally induced stresses and earthquake times approximately two years before the 2011 Tengchong Mw 5.1 and 5.0 earthquakes.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Computer Science, Artificial Intelligence
Ting-Chen Tsan, Teng-Fu Shih, Chiou-Shann Fuh
Summary: This paper proposes an AI solution for solder ball HIP defect inspection, combining CNN and SVM algorithms, with a 3D CNN model and focal loss as well as triplet loss to address data imbalance issues caused by rare defective data. The inspection method outperforms classic CNN models and the deep learning inspection software SuaKIT in terms of performance and testing speed.
MACHINE VISION AND APPLICATIONS
(2021)
Article
Geochemistry & Geophysics
Jordan P. Todes, Emile A. Okal, Stephen H. Kirby
Summary: A systematic analysis of earthquake populations in WadatiBenioff zones was conducted, revealing multi-segment behavior and supporting previous research findings. The study suggests that the traditional 300-km depth boundary between intermediate and deep earthquakes may be artificial and depth boundaries could vary between different subduction zones.
PHYSICS OF THE EARTH AND PLANETARY INTERIORS
(2021)
Article
Geosciences, Multidisciplinary
Dapeng Zhao
Summary: Recent studies on seismic imaging of the Northwest Pacific and East Asian region have revealed significant lateral heterogeneities in the crust and upper mantle, shedding new light on various geological processes such as volcanism, earthquake mechanisms, and mantle dynamics. Significant advancements in seismic imaging techniques, particularly tomographic inversions for 3-D distribution of seismic anisotropy and attenuation, have provided important insights into lithospheric deformation, mantle convection, and the processes associated with plate subductions.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Yang Liu, Mingyu Zhao, Tianchen He, Xingqi Li, Simon W. Poulton
Summary: Molar tooth structures (MTS) are commonly formed in shallow-water carbonate during the Mesoproterozoic and early Neoproterozoic, but their origin and relationship with contemporaneous seawater chemistry remain poorly understood. A study on MTS and host rocks from the Gaoyuzhuang Formation in North China Craton reveals similar isotopic signatures between MTS and host rocks, suggesting an early diagenetic, seawater-buffered origin for MTS. The widespread occurrence of MTS during the Mesoproterozoic to early Neoproterozoic is believed to be linked to sulfate scarcity in the ocean.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Prantik Mandal, D. Srinagesh, G. Suresh, B. Naresh, Mahalaxmi Naidu, Dhiraj Kumar Singh, K. Swathi, Arti Devi, S. Vittal, P. K. Vengala, R. Vijaya Raghavan, M. Shekar, Satish Saha
Summary: This study focuses on mapping the fractal correlation dimensions and b-values of the Palghar and Pulichintala regions of the Indian shield. Results show that the Palghar region may experience moderate earthquakes in the future, while the Pulichintala region poses relatively lower earthquake hazard.
Article
Acoustics
Lifu Wu, Feng Niu, Yecai Guo
Summary: This paper presents a portable active noise control pillow based on a combination of fixed and adaptive feedback structures. Theoretical analysis shows the equivalence of the combination to a zero-pole model formed by concatenating the two structures. Experimental results confirm the superior noise reduction performance of the combined structure compared to single structures, and four guidelines for using the combined fix and adaptive feedback structures are provided.
Article
Geochemistry & Geophysics
Petra Stepancikova, Thomas K. Rockwell, Jakub Stemberk, Edward J. Rhodes, Filip Hartvich, Karen Luttrell, Madeline Myers, Petr Taborik, Dylan H. Rood, Neta Wechsler, Daniel Nyvlt, Maria Ortuno, Jozef Hok
Summary: This study investigated the Quaternary activity of the Sudetic Marginal fault (SMF) in central Europe. The presence of an ice sheet promoted slip on the fault, resulting in a late Pleistocene slip rate of approximately 1.1 mm/yr. In the absence of an ice sheet, the likelihood of fault motion is much lower.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Article
Construction & Building Technology
Nikola Perkovic, Mislav Stepinac, Vlatka Rajcic, Jure Barbalic
Summary: The importance of assessing and reconstructing existing timber structures, especially for exposed elements like timber roofs, has been highlighted. The study focused on criteria for evaluating load-bearing timber structures in seismic active areas, as well as the feasibility of non-destructive and semi-destructive testing methods through a case study.
Article
Geochemistry & Geophysics
Esmail Ansari, Tandis S. Bidgoli
Summary: Injection-induced seismicity has primarily occurred in the crystalline basement of the Arbuckle Group aquifer in the central US. New data from Class I wells in Kansas provide insights into the pressures in the Arbuckle and help constrain the reservoir-scale properties of the basement. Modeling based on this data suggests that pressure increases in Arbuckle may be linked to seismicity in the basement due to overpressure. The study also reveals enhanced reservoir-scale properties of the basement due to faults and fractures.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2021)