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The seismogenic structure of strong intraplate earthquakes in Shantou region, South China: Insights from upper crustal shear-wave velocity structure

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Earthquake Research Advances 2025年

作者： Lue Yang Lun Li Xiuwei Ye Jinming Zhang Jialong He Yuan Gao Pengfei Li Yu He Ziwei Li School of Earth Sciences and Engineering Sun Yat-Sen University and Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) 519082 China China Earthquake Administration Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Agency Guangzhou 510070 China Guangdong Science and Technology Collaborative Innovation Center for Earthquake Prevention and Disaster Mitigation Guangzhou 510070 China Key Laboratory of Disaster Forecast and Control in Engineering of the Ministry of Education Urban Earthquake Safety Laboratory Guangzhou 510070 China

The Shantou region, one of the most seismically active zones of Guangdong Province (South China), has experienced multiple strong earthquakes including two significant events with magnitudes greater than 7.0 occurred in 1600 and 1918, respectively. To investigate the seismogenic structures responsible for these major earthquakes and their potential triggering mechanisms, in this study, we construct a high-resolution shear-wave velocity model from surface to ∼15 km depth based on a dense nodal seismic array using ambient noise tomography. The model reveals a pronounced low-velocity zone (LVZ) at depths of 2-15 km, with a perturbation of -2 to -8%, coinciding with the northwestern extension of the Huanggangshui Fault previously identified in the offshore region. Integrating our results with previous field geological surveys and shallow reflection seismic exploration, we interpret the LVZ as a wide fault zone, potentially comprising multiple fault branches that possibly includes two NW-trending faults (i.e., the Rongjiang Fault and the Hanjiang Fault). Notably, the interaction between the Huanggangshui Fault and NE-trending Littoral Fault is suggested to have triggered the 1918 M7.3 Nan’ao earthquake. Additionally, the 1895 M6.2 earthquake seems to occur at the edge of the LVZ near the Rongjiang Fault, a possible branch of the Huanggangshui Fault, further supporting the association between this structure and seismic activity. These findings imply that the LVZ may represent a region of concentrated tectonic stress, making it a potential site for future strong earthquakes. Consequently, this area should be prioritized in seismic hazard assessments. This study provides valuable insights into the seismogenic characteristics of the Shantou region and contributes to improving seismic hazard evaluations in South China.

关键词： Intraplate earthquakes Nan’ao earthquake Shear-wave velocity Ambient noise tomography Dense seismic array

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Online structural damage detection based on online dictionary learning 9

Online structural damage detection based on online dictionar...

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9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019

作者： Chen, Z.P. Yu, L. School of Mechanics and Construction Engineering Jinan University Guangzhou China Moe Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou China

In order to detect the variation of stiffness in structures, an online structural damage detection (SDD) method is proposed based on online dictionary learning (ODL) in this paper. The acceleration responses of structures are measured as training data to determine an adaptive dictionary which gives sparse representation for the acceleration responses. In the process of ODL, the dictionary is able to be determined in an iterative manner, which means that the dynamically changing data can be used to update the dictionary sequentially. Then, the mean sparsity (MS) is applied as a damage-sensitive index to indicate the occurrence of damage, which therefore formulates a framework to identify structural damage instantaneously. The accuracy of SDD results is investigated based on the proposed online SDD algorithm under random load. Numerical simulations on structural damages of a simply-supported beam are conducted and the SDD results illustrate the effectiveness of the proposed methods for determining whether and when damage emerges. Moreover, as the proposed method is adaptive and model-free method, it provides a wide application prospect in online SDD of real structures. Copyright © SHMII 2019. All rights reserved.

关键词： Structural health monitoring

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Microstructure, Wear and Friction Behavior of Cocraltay-Xcnts Composite Coatings Deposited by Laser-Induction Hybrid Cladding

SSRN

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SSRN 2022年

作者： Zhou, Shenfeng Tingjin, Xie Rui, Zhang Yanliang, Yi Institute of Advance Wear & Corrosion Resistant and Functional Materials Jinan University Guangdong Guangzhou510632 China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangzhou510632 China Laser Technology Institute School of Physical science and Technology Tianjin University of Technology Tianjin300387 China Shaoguan Research Institute of Jinan University 168 Muxi Avenue Shaoguan512027 China

Through this design, partial CNTs occur chemical reactions to create a reinforcement phase, while the other CNTs can be retained as lubrication phase. The MCrAlYTa-xCNTs (x=0,1,2,and 4 wt%) composite coatings were prepared by laser-induction hybrid cladding (LIHC). And the microstructure, hardness, and wear behaviour of coating were systematacially analyzed. Results show that the composite coatings are mainly composed of TaC, γ-(Co,Cr) and β-(Co,Cr)Al. With the increase of CNTs content, the volume fraction of TaC increases from 13.11 vol% to 16.12 vol%. Meanwhile, the nanohardnesses of γ-(Co,Cr) and β-(Co,Cr)Al are improved from 7.49 GPa to 9.36 GPa and 9.72 GPa to 11.19 GPa, respectively. As a result, the microhardness of coating increases from 536.25 HV to 738.16 HV, the wear rate decreases from 32.4×10-3 mg·m-1 to 6.1×10-3 mg·m-1, and the average friction coefficient decreases from 0.55 to 0.44. The good wear performance of the coating is attributed to the increased TaC and the CNTs lubricant film. © 2022, The Authors. All rights reserved.

关键词： Carbon nanotubes

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Axial compressive behavior of seawater and sea-sand concrete (SSC) filled stainless steel tubular columns with FRP confined ssc core 7

Axial compressive behavior of seawater and sea-sand concrete...

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7th Asia-Pacific Conference on FRP in Structures, APFIS 2019

作者： Zeng, L. Yu, W.L. Lu, R.Q. Yuan, H. Li, L.J. MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China School of Civil and Transportation Engineering Guangdong University of Technology Guangzhou510006 China

ISBN: (纸本)9780648752899

The promotion of sea water and sea-sand concrete (SSC) is beneficial to alleviate the resource shortage of fresh water and river-sand, but it is easier to cause the problem of steel corrosion. Owing to good corrosion resistance of fiber-reinforced polymer (FRP) and stainless steel, a novel type of composite, named SSC filled stainless steel tubular columns with FRP confined SSC core (SCFCs), is proposed. In order to study the constraint effect, axial compression tests on 8 SCFC stub columns were conducted, and the influences of parameters as the shape of steel tubes, the existence of FRP tubes, the thickness and the diameter of FRP tubes were analyzed. The test results have shown that the bearing capacity and ductility of SCFCs can be improved by the inner FRP confined SWSSC. FRP contents can help alleviate the phenomenon of steel buckling and further increase the bearing capacity and restrict the dilation of specimens. With similar FRP contents, increasing the diameter of FRP tubes improved the performance of SCFCs more apparently. With similar inner concrete section areas, circular steel tubes has better confinement than square ones. © APFIS 2019. All right reserved.

关键词： Stainless steel

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Three-body problem – from Newton to supercomputer plus machine learning

arXiv

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arXiv 2021年

作者： Liao, Shijun Li, Xiaoming Yang, Yu State Key Lab of Ocean Engineering Shanghai200240 China Center of Marine Numerical Experiment School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai200240 China School of Physics and Astronomy Shanghai Jiaotong University Shanghai200240 China School of Mechanics and Construction Engineering Jinan University Guangzhou510632 China MOE Key Laboratory of Disaster Forecast and Control in Engineering Guangzhou510632 China

The famous three-body problem can be traced back to Newton in 1687, but quite few families of periodic orbits were found in 300 years thereafter. In this paper, we propose an effective approach and roadmap to numerically gain planar periodic orbits of three-body systems with arbitrary masses by means of machine learning based on an artificial neural network (ANN) model. Given any a known periodic orbit as a starting point, this approach can provide more and more periodic orbits (of the same family name) with variable masses, while the mass domain having periodic orbits becomes larger and larger, and the ANN model becomes wiser and wiser. Finally we have an ANN model trained by means of all obtained periodic orbits of the same family, which provides a convenient way to give accurate enough predictions of periodic orbits with arbitrary masses for physicists and astronomers. It suggests that the high-performance computer and artificial intelligence (including machine learning) should be the key to gain periodic orbits of the famous three-body problem. © 2021, CC BY.

关键词： Supercomputers

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Lattice chain theories for dynamics of acoustic flexural phonons in nonpolar nanomaterials

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Physical Review B 2020年第14期102卷 144301-144301页

作者： Y. Kuang L. Lindsay Q. Wang L. He School of Mechanics and Construction Engineering MOE Key Laboratory of Disaster Forecast and Control in Engineering Jinan University Guangzhou 510632 China Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Modern Mechanics University of Science and Technology of China Hefei 230026 China

Knowledge of lattice dynamics of acoustic flexural phonons is critically important in understanding the mechanical, electrical, and thermal properties of nanomaterials. However, the general nature of acoustic flexural phonons for the span of possible nanomaterials and the dependence of these on microscopic material properties remain unclear. Therefore, we develop general lattice chain theories to understand acoustic flexural vibrations in covalent and van der Waals lattices. The analytic theories suggest that the flexure branch has quadratic dispersion for low dimensional lattices in the long-wavelength limit, quite different from linear branches in bulk van der Waals bonded lattices like graphite. Surprisingly, interlayer van der Waals interactions in multilayer lattices do not determine the behavior of the flexural dispersion. The bonds of covalent interactions in multilayer and buckled monolayer lattices play different roles in determining the flexural dispersion with those in flat monolayer lattices, e.g., graphene. Further, based on the correspondence between microscopic and continuum dynamics, we provide a universal and effective approach to characterize the intrinsic bending rigidity of low dimensional nanomaterials using dispersion data.

关键词： Acoustic phonons Bending Mechanical properties of membranes

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Eccentric compression behaviour of raw coal gangue CFST slender columns

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Structures 2025年 78卷

作者： Jialin Li Rui Wang Hui Zhao Yunhe Wang Hongzhi Cui Man-Tai Chen College of Civil Engineering Taiyuan University of Technology Taiyuan 030024 China Shanxi Key Laboratory of Civil Engineering Disaster Prevention and Control Taiyuan University of Technology Taiyuan 030024 China Key Laboratory for Resilient Infrastructures of Coastal Cities (MOE) College of Civil and Transportation Engineering Shenzhen University Shenzhen China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China

Raw coal gangue concrete-filled steel tubular (RCGCFST) member is proposed to expand the application of RCG concrete in structural members. However, research on RCGCFST members has primarily focused on axial compression and bond behaviour. This paper explores both experimental and numerical analyses of the behaviour of RCGCFST slender columns subjected to eccentric compression. Twenty-one slender columns were tested to obtain the failure modes, load versus mid-height deflection responses, and load versus strain relationships. key parameters studied included the raw coal gangue (RCG) replacement rate, steel tube diameter and thickness, slenderness ratio, eccentricity ratio, and water-to-cement ratio of concrete. The test results indicated that incorporating RCG had a moderate influence on the eccentric compression behaviour of the specimens. In addition, a finite element (FE) model was established and benchmarked against the test data. A parametric study employing the FE model was performed to evaluate the effects of the RCG replacement level, steel tube diameter, slenderness ratio, eccentricity ratio, steel ratio, and material strength on the eccentric compression performance of RCGCFST slender columns. Finally, several existing design methods for normal CFST columns were evaluated for their applicability to RCGCFST columns.

关键词： Concrete-filled steel tubular Eccentric compression behaviour Parametric analysis Raw coal gangue

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Transient Analysis Based on Finite Element Method for Ball Grid Array Package

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IOP Conference Series: Earth and Environmental Science 2021年第4期769卷

作者： Wenhao Luo Wei Su Xianshan Dong Zhenhua Nie Agam Tomar MOE Key lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute MOE Key lab of Disaster Forecast and Control in Engineering Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering Science and Technology on Reliability Physics and Application Technology of Electronic Component Laboratory China Electronic Product Reliability and Environmental Testing Research Institute Guangzhou China MOE Key lab of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Guangzhou China Faculty of Engineering and Mathematical Sciences University of Western Australia MOE Key lab of Disaster Forecast and Control in Engineering Perth Australia

In this paper, finite element simulation is carried out for BGA sample. The authors establishes the model of fixture, ceramic panel and metal sheet. Based on this model, several layers papers are laid on the metal sheet for simulation test. Then, ANASYS Workbench is used to conduct transient analysis of the samples to study the influence of different thickness papers on acceleration and time. The results provide useful reference for the adjustment of dynamic response parameters.

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Bibliometric Analysis of Monte Carlo Based on Citespace 4

Bibliometric Analysis of Monte Carlo Based on Citespace

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4th IEEE International Conference on Image, Vision and Computing, ICIVC 2019

作者： Yang, Songping Yang, Fan Zhang, Ranni Zhang, Landian Packaging Engineering Institute Jinan University Zhuhai China MOE Key Laboratory of Disaster Forecast and Control in Engineering School of Mechanics and Construction Engineering Jinan University Zhuhai China Electrical Engineering Institute Jinan University Zhuhai China Zhuhai Campus Jinan University Zhuhai China

ISBN: (纸本)9781728123257

As an effective method for solving nonlinear problems and simulating models, Monte Carlo method (MCM) has attracted more and more attention in recent years, which has been successfully applied in fields such as electrical and electronic engineering, physical chemistry, material science and geophysics. In this paper, the research progress of MCM is introduced based on the analysis of the literature in the field of MCM in Citespace. Based on the visualization results, the Evolution Law of MCM Research, the research hotspot and the future trend are discussed. This study will provide important reference resources for theoretical researchers and practitioners in the fields of solving non-linear problems and system simulation. © 2019 IEEE.

关键词： Monte Carlo methods

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Comparison of the sand flow over mobile sand, farmland, and gobi surfaces and the conditions required for saturated sand flow to develop

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Soil and Tillage Research 2025年 254卷

作者： Xiaoyu Zhang Chunlai Zhang Xuesong Wang Bo Wu Zhuoli Zhou Wenping Li Jiaqi Zhao Xiaofeng Zuo Yixiao Yuan State Key Laboratory of Earth Surface Processes and Disaster Risk Reduction MOE Engineering Research Center of Desertification and Blown-sand Control Faculty of Geographical Science Beijing Normal University Beijing 100875 China Institute of Ecological Conservation and Restoration Chinese Academy of Forestry Beijing 100091 China

The soil surface’s content of particles that are erodible at different wind velocities determines whether the sand flow can become saturated. However, the quantitative relationship between the content of erodible particles and the saturation degree of the sand flow is not yet known. Using field observations of the sand flow above surfaces with greatly different erodibility (mobile sand, farmland, and gobi), we calculated the degree of saturation of the sand flow (δ) at each site, which is defined as the ratio of the measured sand transport rate to the potential saturated transport rate. The sediment’s grain-size composition determined the content of erodible particles, which increased with increasing wind velocity. We found that δ of each surface increased following a power function with increasing shear velocity ( u * ) and exponentially with increasing content of erodible particles. When u * increased to 0.5 m s −1 , all particles from the mobile sand were erodible, enabling the sand flow to become almost saturated, whereas the sand flow over farmlands and gobis was far from saturated because fewer particles were erodible at a given wind velocity. Based on the relationship between δ and u * , we identified the conditions for sand flow to achieve saturation at each site; that is, the shear velocity ( u *sat ) that can entrain most particles from the surface. Under normal weather conditions, the near-surface shear velocities of bare farmland and gobi surfaces rarely reaches u *sat , resulting in a generally unsaturated sand flow. Thus, both land types were always exposed to a wind-erosion-dominated environment.

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