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Application of Transformer-based Anomaly Detection in Dam Structural Strong Motion monitoring Data

ce/papers 2025年第2期8卷 749-759页

作者： Xiang, Hong Zhu, Jiajian Zhang, Yi Zhang, Yuting Zhu, Xinhua CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Agency Guangzhou China Guangdong Yuehai Feilaixia Hydropower Co. Ltd. Lechangxia Branch Shaoguan China

In the context of structural monitoring systems, the persistent acquisition of high-fidelity data is crucial for ensuring the reliability of system outputs. However, anomalies are inevitably present due to the intricate operational status of sensing and acquisition devices. This study presents a neural network architecture predicated on the Transformer model, tailored for the detection and categorization of anomalies within dam structural health monitoring data. The temporal sequences of the monitoring data serve as direct inputs to the Transformer framework, with feature extraction facilitated through an elaborate six-layer encoder module. The input temporal sequences are eventually categorized into four discrete classes: normal, missing, drift, and burr. The experimental results substantiate the robust efficacy of the proposed approach across binary and multi-class classification paradigms. The deployment of this method on continuous monitoring data underscores its capacity to ensure the correctness of data, thereby bolstering the reliability of dam monitoring systems. © 2025 Ernst & Sohn GmbH.

关键词： Structural health monitoring

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Tomographic inversion of OBS converted shear waves:case study of profile EW6 in the Dongsha area

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Acta Oceanologica Sinica 2024年第8期43卷 13-25页

作者： Genggeng Wen Kuiyuan Wan Shaohong Xia Xiuwei Ye Huilong Xu Chaoyan Fan Jinghe Cao Shunshan Xu CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake AgencyGuangzhou 510070China Guangdong Science and Technology Collaborative Innovation Center for Earthquake Prevention and Disaster Mitigation Guangzhou 510070China MOE Key Laboratory of Disaster Forecast and Control in Engineering-Urban Earthquake Safety Laboratory Guangzhou 510070China CAS Key Laboratory of Ocean and Marginal Sea Geology South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China 6 Centro de Geociencias Universidad Nacional Autónoma de MéxicoQuerétaroC.P.76230Mexico

Studies of converted S-wave data recorded on the ocean bottom seismometer(OBS)allow for the estimation of crustal S-wave velocity,from which is further derived the Vp/Vs ratio to constrain the crustal lithology and geophysical *** a precise S-wave velocity model is important for deep structural research,and inversion of converted S-waves provides a potential ***,the inversion of the converted S-wave remains a weakness because of the complexity of the seismic ray path and the inconsistent conversion *** this study,we introduced two travel time correction methods for the S-wave velocity inversion and imaged different S-wave velocity structures in accordance with the corresponding corrected S-wave phases using seismic data of profile EW6 in the northeastern South China Sea(SCS).The two inversion models show a similar trend in velocities,and the velocity difference is<0.15 km/s(mostly in the range of 0–0.1 km/s),indicating the accuracy of the two travel time correction methods and the reliability of the inversion *** to simulations of seismic ray tracing based on different models,the velocity of sediments is the primary influencing factor in ray tracing for S-wave *** the sedimentary layer has high velocities,the near offset crustal S-wave refractions cannot be *** contrast,the ray tracing of Moho S-wave reflections was not significantly impacted by the velocity of the *** two travel time correction methods have their own advantages,and the application of different approaches is based on additional *** works provide an important reference for future improvements in converted S-wave research.

关键词： converted S-wave S-wave velocity structure inversion ocean bottom seismometer northeastern South China Sea

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Quaternary Sediment Thicknesses, Paleochannels, and Hazard Assessment Revealed by a 6200-Station Array in the Guangdong–Hong Kong–Macao Greater Bay Area, South China

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Bulletin of the Seismological Society of America 2025年第2期115卷 694-706页

作者： Xiong, Cheng Deng, Yangfan Ye, Xiuwei Wang, Liwei Zhang, Yanxin Lv, Zuoyong Wang, Xiaona Gong, Xuan He, Xiaobo State Key Laboratory of Deep Earth Processes and Resources Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Agency Guangzhou China College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China Marine Science and Technology College Zhejiang Ocean University Zhejiang Zhoushan China

The Guangdong–Hong Kong–Macao Greater Bay area, a highly populated region, plays a vital role in the economic development of East Asia. Its construction and development rely on accurately characterizing near-surface loose sediment layers. However, traditional drilling and active source methods are often impractical for large-scale exploration in densely populated areas due to their high costs and destructive nature. To overcome this shortage, a dense array comprising 6214 stations was deployed and the noise horizontal-to-vertical spectral ratio method was employed to determine the fundamental frequency (f0) and peak amplitude. The Quaternary sediment thickness was further estimated based on their empirical relationships with f0. More importantly, several buried paleochannels were iden-tified, manifesting deep valleys on the vertical section and curved stripes on the horizontal section. Combining regional drilling data and sites of geological hazards in the past, we conclude that the paleochannels are zones of high seismic and geological hazard. This study provides a scientific basis for urban construction and disaster prevention. © Seismological Society of America.

关键词： disaster prevention

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Seismic response analysis of Xinfengjiang reservoir dam based on strong earthquake records and numerical simulation

Seismic response analysis of Xinfengjiang reservoir dam base...

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2021 International Conference on Computational Modeling, Simulation, and Data Analysis, CMSDA 2021

作者： Zhang, Yi Ding, Shi-Qian Jiang, Hui Zhu, Jia-Jian Li, Jin CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake Agency Guangzhou510070 China Guangdong Prov. Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Projects Guangdong Earthquake Agency Guangzhou510070 China Shenzhen Academy of Disaster Prevention and Reduction Shenzhen518003 China

ISBN: (纸本)9781510651968

Since Xinfengjiang Reservoir began to store water, earthquakes occurred frequently in the reservoir area. Even now, earthquakes are still frequently raging in that region. The fortification intensity of the reservoir dam was 6 degrees at the initial stage of construction, which was obviously low. After that, it has been reinforced twice, so it is necessary to analyze the seismic response of the reinforced dam. In this paper, the strong earthquake records of the dam and finite element simulation technology are used to analyze the seismic response of the dam. The results show that: under the action of small earthquakes, the acceleration response of the dam sections on both banks is larger along the dam direction, while the acceleration response of the middle dam section along the river direction and in the vertical direction is larger, and the dam amplification is obvious. Under the action of a fortification earthquake, the maximum displacement of the dam occurs at the top of the dam, and the major tensile stress is at the downstream outlet and dam heel, but they are all within the safe range. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Finite element method

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A Suggestion to Take Seismic Hazard Characteristics into Account in Design of Highway Bridges 9

A Suggestion to Take Seismic Hazard Characteristics into Acc...

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9th International Technical Conference on Frontiers of Hydraulic and Civil Engineering technology, HCET 2024

作者： Tao, Xiaxin Tao, Zhiguo Tao, Zhengru Liu, Haiming Wang, Liyuan Wang, Futong State Key Laboratory of Bridge Engineering Structural Dynamics China Merchants Chongqing Communication Research & Design Institute Co. Ltd Chongqing400067 China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics CEA Harbin150080 China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency Management Harbin150080 China Heilongjiang University of Science and Technology Harbin150027 China Heilongjiang University Harbin150080 China

ISBN: (纸本)9781643685595

The seismic hazard characteristics are emphasized in this paper. The three K values from the seismic ground motion parameters zoning map 2015 (SHM 2015) of China are introduced, which are the ratios of the frequent, rare and very rare peak ground motion accelerations to the basis peak ground motion acceleration. The data of the three K values on 95932 ground points in mapping of the SHM 2015 are collected and analyzed. However, in a industry standard, the specification for seismic design of highway bridges (SSDHB), there is no corresponding regulation on how to determine the specific values on engineering site. The inconsistency of these two standards has brought some confusion and inconvenience to the seismic design of highway bridges. A site specified importance factor for updating of the specification for seismic design of highway bridges 2020 is presented to take into account the hazard characteristics from a zoning map of K values. Finally, a scheme to determine the factor value for seismic design of a bridge with its type and the site location is suggested. © 2024 The Authors.

关键词： Zoning

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3-D Crustal Shear Velocity and Azimuthally Anisotropic Structure of the Pearl River Delta Onshore-Offshore Area and its Tectonic Implications

SSRN

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SSRN 2023年

作者： Lü, Zuoyong Ye, Xiuwei Zhang, Yanxin Qian, Yinping Wen, Genggeng Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology China Earthquake Administration Guangzhou China Key Laboratory of Earthquake Early Warning and Safety Diagnosis of Major Project Guangdong Earthquake Agency Guangzhou China

The Pearl River Delta (PRD) onshore-offshore area lies to the transition zone between the South China and the northern continental margin of South China Sea. For better understanding the tectonic and deformation pattern at depth, we developed a 3-D high-resolution crustal shear wave velocity (Vs) and azimuthal anisotropy model by ambient noise tomography in this region. The data sets comprise ~30 day of seismic ambient noise recorded by 124 land seismic stations and 28 Ocean Bottom Seismometers (OBS). Our results reveal strong lateral constrasts of azimuthal anisotropy in the crust. The fast axes of the azimuthal anisotropy in land show approximately NW-SE direction, which may be mainly controlled by regional stress field. In the offshore PRD, however, the fast axes of anisotropy strike nearly NE-SW direction, which likely be dominated by the littoral fault zone. The anisotropic model is combined with other previous results to reveal three major crustal deformation processes of this region since the Yanshanian. Furthermore, a upper-middle crustal frozen mafic magma chamber with high-Vs (~3.85-4.0 km/s) is clearly imaged beneath Shenzhen, Zhuhai and Hong Kong area. It is probably a source of intense magmatic activities in and around Hong Kong region during late Mesozoic. Our new model provides important constraints for understanding the crustal architecture and the multi-stage deformation processes in and around the PRD onshore-offshore area. © 2023, The Authors. All rights reserved.

关键词： Anisotropy

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Non-Contact Detection of Vital Signs with a Hybrid Feature Extraction Method using a UWB Radar Sensor 6

Non-Contact Detection of Vital Signs with a Hybrid Feature E...

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6th IEEE International Conference on Intelligent Computing and Signal Processing, ICSP 2021

作者： Zhu, Jiajian Li, Jin Fan, Zhening Xie, Haizhu Wang, Lixin He, Yuxin Ling, Jing Cea Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Provincial Key Lab. of Earthquake Early Warning and Safety Diagn. of Major Projects Guangdong Earthquake Agency Guangzhou510070 China Shenzhen Research Institute City University of Hong Kong Shenzhen518057 China

ISBN: (纸本)9780738143705

The ultra-wide band (UWB) radar sensor is widely used in Radar-based Life Detecting System for search and rescue due to its short detection time, high penetrating power and low energy consumption. However, performance of non-contact detection is limited in complex post-disaster environments due to the noise and clutter. In this paper, a hybrid feature extraction method based on Hilbert-Huang Transform (HHT), Fast Fourier Transform (FFT) and correlation analysis is proposed to obtain the echo signal features. Then a classification model based on support vector machine (SVM) is established to identify the respiratory information embedded in the echo signal. The experimental results show that the proposed method can accurately identify the location of human body through different obstacles. © 2021 IEEE.

关键词： Support vector machines

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Study of the Seismogenic Structure of the October 12^(th),2019 MS5.2 Beiliu earthquake,Guangxi,China

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earthquake Research in China 2020年第2期34卷 227-239页

作者： BI Lisi LU Banghua YANG Xuan WU Bin Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake AgencyGuangzhou 510070China

On October 12th,2019,a MS5.2 earthquake occurred in Beiliu City,Guangxi Zhuang Autonomous Region,China,with a focal depth of 10 km. The epicenter is located in the junction of Guangxi and Guangdong where the moderate-strong earthquakes are relatively active. The highest intensity of this earthquake is estimated up to Ⅵ besides the isoseismic line showed an ellipse shape with a long axis trend in the NW *** aftershocks are not evenly distributed. The parameters of the focal mechanism solutions are: strike 346°,dip 85°,rake 19° for the nodal planeⅠ,and strike 254°,dip 71°,rake 175° for the nodal planeⅡ. The type of the coseismic fault is strikeslip. After analyzing these results above and the active faults near the epicenter,we get that the nodal planeⅠ is interpreted as the coseismic rupture plane and the BamaBobai Fault is a seismogenic structure of MS5.2 Beiliu earthquake.

关键词： MS5.2 Beiliu earthquake Seismogenic structure Border area between Guangdong and Guangxi Bama-Bobai Fault

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Study on travel-time correction of stations in Guangdong seismic network and its influence on earthquake location accuracy

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earthquake Research Advances 2024年

作者： Ming Liang Xuan Yang Ce Jiang Ping Tian Qingxi Lin Xijiao Jiang Guangdong Earthquake Agency Guangzhou 510070 China Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology CEA Guangzhou 510070 China

The travel-time corrections for the primary seismic phases of 72 stations in the Guangdong seismic network, relative to the 1-D South China travel-time model, were determined using JHD method and statistical analysis method. The travel-time corrections for the Pg phase of 72 stations range between -0.25 s and 0.14 s, while the corrections for the Sg phase are between 0.27 s and 0.35 s, and those for the Pn phase are between -0.86 s and 0.07 s. The spatial distribution of travel-time corrections for Pg, Sg, and Pn phases of 72 stations correlates well with the geological structure in this region. This indicates that the travel-time corrections for Pg and Sg phases are mainly caused by the discrepancy between the actual crustal velocity structure beneath the stations and the 1-D South China travel-time model. These corrections serve to empirically compensate for the systematic errors in travel time caused by the above difference. The primary factor contributing to the travel-time corrections for the Pn phase is the fluctuation or tilting of the Moho. These corrections are intended to compensate for systematic errors in travel time caused by variations in the actual Moho. With integrating the obtained travel-time corrections into the Hyposat location algorithm, test results showed an obvious improvement in location accuracy and origin time precision for explosion events. The variation of horizontal distance between repeating earthquake pairs has also improved, with 86% of the repeating earthquake pair spacing being more accurately estimated after correction. This suggests the crucial significance of travel-time correction in earthquake location, and the consideration of travel-time correction exerts a notable impact on enhancing the accuracy of earthquake location.

关键词： travel-time correction joint hypocentral determination statistical analysis hyposat location accuracy

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Velocity and density contrasts across the Moho interface of Guangdong province in south China constrained by receiver functions

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earthquake Science 2020年第3期33卷 141-152页

作者： Yin-Ping Qian Xu-Zhang Shen Xin Zhang Wen-Jun Zheng Yue-Jun Wang Guangdong Provincial Key Laboratory of Earthquke Early Warning and Safety Diagnosis of Major Projects Guangdong Earthquake AgencyGuangzhou 510070China School of Earth Science and Engineering Sun Yat-sen UniversityGuangzhou 510070China CEA Key Laboratory of Earthquake Monitoring and Disaster Mitigation Technology Guangdong Earthquake AgencyGuangzhou 510070China

The P receiver function includes P-to-SV converted phases and multiple reverberations of the discontinuities in the crust and *** time of these phases is related to the crustal thickness and vp/vs ratio,and the amplitude of these phases is mainly controlled by the velocity and density contrast of *** using H-κstacking method,this work estimated the crustal thickness and vP/vS ratio beneath the stations in the Guangdong province of South *** velocity and density contrast(δβ-δρ)scanning stacking algorithm of the receiver function is applied to constrain the velocity and density contrast of the Moho in Guangdong *** work analyzed the results of the crustal thickness,vp/vS ratio,and the velocity and density contrasts of *** results indicate that the velocity contrast is higher beneath Yangjiang area in western Guangdong province and Nanao area in eastern Guangdong,which has a strong correlation with the distribution of geothermal springs in local areas and the characteristics of high heat *** velocity contrast of Moho has also a good correlation with the vP/vS ratio and the crustal thickness,which indicates that there is a strong material composition contrasts of the Moho in the study *** and density contrasts of Moho in some local area(such as western Guangdong)are somewhat consistent with the seismic activities.

关键词： Moho discontinuity velocity contrast density con—trast receiver function Guangdong province

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