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Impact of Train Formation on the Dynamic Responses and Operational Safety of High-Speed Trains under Non-Uniform Seismic Ground Motion SCIE
期刊论文 | 2024 , 16 (7) | SYMMETRY-BASEL
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Abstract :

The study of dynamic responses and operational safety of high-speed trains under seismic excitation has increasingly relied on numerical simulation as the most effective and convenient research approach. The majority of studies only focus on single-car formation, and fewer utilize train models with actual standard formation, inevitably resulting in differences in dynamic characteristics of train models and simulation results. Furthermore, trains also have different standard formations in different countries and operating scenarios. Therefore, the influences of train formation on the dynamic responses and operational safety of trains under seismic action are investigated. Hence, a detailed train/vehicle-track coupled dynamics model was established to simulate trains under non-uniform seismic ground motion. Moreover, due to wheel-rail contact simulation being the key factor constraining simulation efficiency, based on the influence pattern of train formation, whether fewer train formations can achieve the same simulation accuracy as the 8-car standard formation is also explored in this paper considering seismic wave propagation effect. Results indicate that variation in train formation can influence the dynamic responses of a coupled system significantly from both the perspective of wheel-rail interaction and vehicle kinematic responses. Moreover, the 5-car formation model can better meet the accuracy requirement and significantly improve computational efficiency compared to 8-car formation model.

Keyword :

seismic wave propagation effect seismic wave propagation effect train/vehicle-track coupled dynamics model train/vehicle-track coupled dynamics model numerical simulation numerical simulation train formation train formation wheel-rail interaction wheel-rail interaction

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GB/T 7714 Zhong, Kangming , Li, Xiaojun , Zhou, Zhenghua . Impact of Train Formation on the Dynamic Responses and Operational Safety of High-Speed Trains under Non-Uniform Seismic Ground Motion [J]. | SYMMETRY-BASEL , 2024 , 16 (7) .
MLA Zhong, Kangming 等. "Impact of Train Formation on the Dynamic Responses and Operational Safety of High-Speed Trains under Non-Uniform Seismic Ground Motion" . | SYMMETRY-BASEL 16 . 7 (2024) .
APA Zhong, Kangming , Li, Xiaojun , Zhou, Zhenghua . Impact of Train Formation on the Dynamic Responses and Operational Safety of High-Speed Trains under Non-Uniform Seismic Ground Motion . | SYMMETRY-BASEL , 2024 , 16 (7) .
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2021年5月21日漾濞MS6.4地震极震区地形效应对地震动特性的影响
期刊论文 | 2024 , 46 (1) , 144-156 | 地震学报
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Abstract :

基于对2021年5月21日漾濞MS6.4地震微观震中秀岭村进行的震害调查,利用流动观测地形台阵观测资料,分析了地形效应对地震动特性的影响。结果表明,若地震波垂直山脉走向入射,陡坡会放大地震波的高频部分,且不同高程处,山脉垂向低频差异较大,山脉走向低频差异较小。利用谱衰减法计算高频衰减参数的场地影响项κ0,分析了水平和竖向分量的κ0与场地软弱程度和卓越频率的相关性,其结果表明,在小尺度范围内,水平分量和竖向分量的κ0均具有较强的空间不均匀性。

Keyword :

地形效应 地形效应 高频衰减参数 高频衰减参数 场地效应 场地效应 震害现象 震害现象

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GB/T 7714 张立宝 , 傅磊 , 周正华 et al. 2021年5月21日漾濞MS6.4地震极震区地形效应对地震动特性的影响 [J]. | 地震学报 , 2024 , 46 (1) : 144-156 .
MLA 张立宝 et al. "2021年5月21日漾濞MS6.4地震极震区地形效应对地震动特性的影响" . | 地震学报 46 . 1 (2024) : 144-156 .
APA 张立宝 , 傅磊 , 周正华 , 林国良 , 陈苏 , 刘爱文 et al. 2021年5月21日漾濞MS6.4地震极震区地形效应对地震动特性的影响 . | 地震学报 , 2024 , 46 (1) , 144-156 .
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Investigation on the nonlinear interaction between electro-hydraulic shaking table array and test structure SCIE
期刊论文 | 2024 , 68 | STRUCTURES
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Abstract :

In the past decades, considerable attention has been paid to the strongly nonlinear control-structure interaction (CSI) between shaking table array and test structure. Although some encouraging progress have been made, developing accurate system model and conducting in-depth analysis are less successful and still require further research. This work establishes an analytical model of two different shaking tables and test structure. Based on the analytical model, an in-depth study is conducted to investigate the CSI effects under different shaking table conditions. The analysis shows the CSI effects on single shaking table, the coupling between shaking tables, the synchronous and tracking control performance of shaking table array, and the measured frequency of test structure. Compared with previous studies which assume two shaking tables are the same, the new findings are that the influence of the CSI on single shaking table decreases, the synchronization performance of shaking table array is extremely degraded, and the measured frequency is smaller than the real frequency of test structure. More importantly, the previous shaking table test results can be corrected based on this study.

Keyword :

Different shaking tables Different shaking tables Test structure Test structure Test accuracy Test accuracy Control performance Control performance Control-structure interaction Control-structure interaction

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GB/T 7714 Wang, Juke , Li, Xiaojun , Liu, Aiwen et al. Investigation on the nonlinear interaction between electro-hydraulic shaking table array and test structure [J]. | STRUCTURES , 2024 , 68 .
MLA Wang, Juke et al. "Investigation on the nonlinear interaction between electro-hydraulic shaking table array and test structure" . | STRUCTURES 68 (2024) .
APA Wang, Juke , Li, Xiaojun , Liu, Aiwen , Chen, Su , Fu, Lei , Liu, Haoran et al. Investigation on the nonlinear interaction between electro-hydraulic shaking table array and test structure . | STRUCTURES , 2024 , 68 .
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Time-domain dynamic constitutive model suitable for mucky soil site seismic response SCIE
期刊论文 | 2024 , 23 (1) , 1-13 | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION
WoS CC Cited Count: 1
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Abstract :

Soil nonlinear behavior displays noticeable effects on the site seismic response. This study proposes a new functional expression of the skeleton curve to replace the hyperbolic skeleton curve. By integrating shear modulus and combining the dynamic skeleton curve and the damping degradation coefficient, the constitutive equation of the logarithmic dynamic skeleton can be obtained, which considers the damping effect in a soil dynamics problem. Based on the finite difference method and the multi-transmitting boundary condition, a 1D site seismic response analysis program called Soilresp1D has been developed herein and used to analyze the time-domain seismic response in three types of sites. At the same time, this study also provides numerical simulation results based on the hyperbolic constitutive model and the equivalent linear method. The results verify the rationality of the new soil dynamic constitutive model. It can analyze the mucky soil site nonlinear seismic response, reflecting the deformation characteristics and damping effect of the silty soil. The hysteresis loop area is more extensive, and the residual strain is evident.

Keyword :

seismic response seismic response mucky soil mucky soil logarithmic dynamic skeleton logarithmic dynamic skeleton time-domain dynamic constitutive model time-domain dynamic constitutive model dampening effect dampening effect

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GB/T 7714 Dong, Qing , Chen, Su , Jin, Liguo et al. Time-domain dynamic constitutive model suitable for mucky soil site seismic response [J]. | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION , 2024 , 23 (1) : 1-13 .
MLA Dong, Qing et al. "Time-domain dynamic constitutive model suitable for mucky soil site seismic response" . | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION 23 . 1 (2024) : 1-13 .
APA Dong, Qing , Chen, Su , Jin, Liguo , Zhou, Zhenghua , Li, Xiaojun . Time-domain dynamic constitutive model suitable for mucky soil site seismic response . | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION , 2024 , 23 (1) , 1-13 .
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Effect of Soil-Bridge Interactions on Seismic Response of a Cross-Fault Bridge: A Shaking Table Test Study SCIE
期刊论文 | 2024 , 14 (6) | BUILDINGS
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Abstract :

A shaking table test of a 1/60 scale cross-fault bridge model considering the effects of soil-bridge interactions was designed and implemented, in which the bridge model was placed in two individual soil boxes to simulate the bridge across a strike-slip fault. Three seismic ground motion time-histories with permanent displacements were selected as input excitations to investigate the influence of seismic ground motions with different frequency characteristics on the seismic response of the testing soil-bridge model. The one-side input method was used to simulate the seismic response of bridges across faults. The seismic responses of the soil and bridge in terms of acceleration, strain, and displacement were analyzed. The test results show that the one-side input method can simulate the seismic response of the main girder displacements well and the displacements and strains of piers and piles of the bridge structure spanning a fault. The strain responses at near-fault pile foundations are much larger than those farther away from the fault. Compared with other bridges, the cross-fault bridge is more prone to torsional and displacement responses during earthquakes. Surface fault rupture can lead to permanent inclination of the bridge piers, which should be paid more attention to in the practical engineering design of the bridges. Soil-bridge interactions can suppress the amplification effect of soil on ground motions. The test results can provide a reference for future research and the design of cross-fault bridges.

Keyword :

shaking table test shaking table test soil-bridge structure interaction soil-bridge structure interaction seismic response seismic response cross-fault bridge cross-fault bridge

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GB/T 7714 Guo, Kunlin , Li, Xiaojun , Wang, Ning et al. Effect of Soil-Bridge Interactions on Seismic Response of a Cross-Fault Bridge: A Shaking Table Test Study [J]. | BUILDINGS , 2024 , 14 (6) .
MLA Guo, Kunlin et al. "Effect of Soil-Bridge Interactions on Seismic Response of a Cross-Fault Bridge: A Shaking Table Test Study" . | BUILDINGS 14 . 6 (2024) .
APA Guo, Kunlin , Li, Xiaojun , Wang, Ning , Wen, Zengping , Wang, Yanbin . Effect of Soil-Bridge Interactions on Seismic Response of a Cross-Fault Bridge: A Shaking Table Test Study . | BUILDINGS , 2024 , 14 (6) .
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Strong ground motion characteristics of the 2022 MW 6.6 Luding earthquake and regional variability in ground motion among three earthquake areas in Sichuan, Southwest China SCIE
期刊论文 | 2024 , 22 (9) , 4335-4355 | BULLETIN OF EARTHQUAKE ENGINEERING
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Abstract :

This paper analyzed the strong motion characteristics based on 86 three-component strong motion records of the MW 6.6 Luding earthquake. Additionally, the factors that influence the variation in ground motion for three earthquakes with similar magnitude in Sichuan Province were investigated. The analysis result indicates a strong correlation between the observed ground motion parameters and the distribution of published Modified Mercalli Intensity. The residual analysis reveals that the spectral accelerations at periods 0.1-10.0 s are amplified to 0.0798-0.3057 times the mean level in the rupture forward direction and weakened to 0.0738-0.2831 times the mean level in the rupture backward direction. The maximum pulse direction recorded by the 51LDJ station is N6 degrees E, aligning with the vertical fault direction. The velocity pulses has distinct bidirectional pulses in the waveforms, with a PGV of 37.0 cm/s. The source effect of the strike-slip MW 6.6 Luding and MW 6.5 Jiuzhaigou earthquakes on ground motion is relatively less significant compared to the average level of mainshocks in southwest China. However, the thrust-fault MW 6.7 Lushan earthquake exhibits a stronger source effect on ground motion during short and medium periods, but a weaker source effect during long periods when compared to the average level. The anelastic attenuation of the Longmenshan, Xianshuihe, and Huya fault zones in Sichuan exhibits significant regional variation and periodic correlation. This phenomenon is closely linked to the regional tectonic background variations and the heterogeneity of crustal structure within the area.

Keyword :

M-W 6.6 Luding earthquake M-W 6.6 Luding earthquake Regional variability Regional variability GMPE GMPE Strong motion characteristics Strong motion characteristics Directivity effect Directivity effect

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GB/T 7714 Zhang, Bin , Li, Xiaojun , Yu, Yanxiang et al. Strong ground motion characteristics of the 2022 MW 6.6 Luding earthquake and regional variability in ground motion among three earthquake areas in Sichuan, Southwest China [J]. | BULLETIN OF EARTHQUAKE ENGINEERING , 2024 , 22 (9) : 4335-4355 .
MLA Zhang, Bin et al. "Strong ground motion characteristics of the 2022 MW 6.6 Luding earthquake and regional variability in ground motion among three earthquake areas in Sichuan, Southwest China" . | BULLETIN OF EARTHQUAKE ENGINEERING 22 . 9 (2024) : 4335-4355 .
APA Zhang, Bin , Li, Xiaojun , Yu, Yanxiang , Lu, Xiaojian , Rong, Mianshui , Chen, Su et al. Strong ground motion characteristics of the 2022 MW 6.6 Luding earthquake and regional variability in ground motion among three earthquake areas in Sichuan, Southwest China . | BULLETIN OF EARTHQUAKE ENGINEERING , 2024 , 22 (9) , 4335-4355 .
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Comparison and analysis of the influence of different shapes of 3D concave topographies on site ground motion
期刊论文 | 2023 , 44 (11) , 3327-3338 | ROCK AND SOIL MECHANICS
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The seismic responses of three-dimensional (3D) concave topography sites were calculated by the combination method of finite element discrete model, the viscoelastic artificial boundary and the central difference integral formula, and the characteristics and differences of the influence of pyramid-shaped, hemisphere-shaped and prism-shaped concave topographies in homogeneous elastic half space on site ground motion were analyzed under the vertical incidence of P wave and SV waves. (1) The influence of different shapes of concave topographies on site ground motion is significantly different, namely, the prism-shaped concave topography>the hemisphere-shaped concave topography>the pyramid-shaped concave topography, but the differences between the different concave topographies are more manifested in the medium frequency range. (2) Concave topographies have a complex scattering effects on seismic waves. Whether it is vertically incident P wave or vertically incident SV wave (only vertical or horizontal seismic motion input), it can produce significant ground motions in both directions in and near the sag area, and while SV wave is vertically incident, the wave scattering of concave topography is more intense, and furthermore the amplitude of ground motion in vertical direction generated by SV wave is even greater than that in horizontal direction. (3) The concave topography may cause the topographical edge effect of ground motion, and the ground motion at the edge of prism-shaped concave is significantly amplified, while this effect is relatively weak in the pyramid-shaped and hemisphere-shaped concave topographies. The study reveals that the steep degree of the concave edge has a significant impact on site ground motion, and that the edge effect of concave topography may exist and is closely related to the steep degree of the concave edge. This research result gives an important hint for the analysis of practical engineering problems, that is, the rational treatment of concave edge parts should be paid special attention to when establishing a simplified analysis model of concave topography. The research results can be applied to the engineering construction in mountainous areas, especially bridge and dam construction, and provide a reference for its seismic fortification to consider the characteristics and differences of different shapes of concaves on site ground motion, especially the possible topography edge effect.

Keyword :

topography edge effect topography edge effect concave topography concave topography viscoelastic boundary viscoelastic boundary site ground motion site ground motion topography influence topography influence

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GB/T 7714 Li Xiao-jun , Ren Peng-liang , Wang Yu-shi et al. Comparison and analysis of the influence of different shapes of 3D concave topographies on site ground motion [J]. | ROCK AND SOIL MECHANICS , 2023 , 44 (11) : 3327-3338 .
MLA Li Xiao-jun et al. "Comparison and analysis of the influence of different shapes of 3D concave topographies on site ground motion" . | ROCK AND SOIL MECHANICS 44 . 11 (2023) : 3327-3338 .
APA Li Xiao-jun , Ren Peng-liang , Wang Yu-shi , Li Zai-xian , Zhong Kang-ming , Dong Qing . Comparison and analysis of the influence of different shapes of 3D concave topographies on site ground motion . | ROCK AND SOIL MECHANICS , 2023 , 44 (11) , 3327-3338 .
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Effects of pulse-like ground motions on tunnels in saturated poroelastic soil for obliquely incident seismic waves SCIE
期刊论文 | 2023 , 173 | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
WoS CC Cited Count: 2
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Abstract :

It has been widely recognised that near-fault ground motions can be distinctly different from far-fault ground motions, in terms of their amplitudes and spectral characteristics, and there are a number of studies investigating the effects of near-fault ground motions on the structural response. However, only a few studies focus on underground tunnels, and most of them consider vertically incident seismic waves, neglecting the wave passage effect which is critical for long tunnels. This paper investigates the consequences of near-fault pulse-like ground motions on the seismic tunnel response, with an example of a tunnel embedded in saturated poroelastic soil. The input motions are represented by obliquely incident P1 waves, and the wave passage effect along the longitudinal direction is considered by a 2.5D modelling technique. The seismic tunnel response for near-fault pulse-like and far-fault ground motions is compared. Additionally, artificial ground motions, which have consistent acceleration response spectra with the near-fault pulse-like ground motions, but without velocity pulses, are generated to gain further insight into the contribution of velocity pulses. It is shown that the near-fault pulse-like ground motions can noticeably increase the tunnel internal forces, due to large seismic energy associated with the velocity pulses. For pulse-like ground motions with similar acceleration response spectra, the fling-step velocity pulse can be more detrimental to the tunnel than the forward-directivity velocity pulse. Moreover, the amplification effect of the near-fault pulse-like ground motions on the tunnel internal forces tends to be more prominent for large vertical angles of incidence, highlighting the significance of considering the oblique incidence case for seismic design.

Keyword :

Saturated poroelastic soil Saturated poroelastic soil Forward-directivity velocity pulse Forward-directivity velocity pulse Fling-step velocity pulse Fling-step velocity pulse Wave passage effect Wave passage effect Underground tunnels Underground tunnels Near-fault pulse-like ground motions Near-fault pulse-like ground motions

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GB/T 7714 Zhu, Jun , Li, Xiaojun , Liang, Jianwen et al. Effects of pulse-like ground motions on tunnels in saturated poroelastic soil for obliquely incident seismic waves [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2023 , 173 .
MLA Zhu, Jun et al. "Effects of pulse-like ground motions on tunnels in saturated poroelastic soil for obliquely incident seismic waves" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 173 (2023) .
APA Zhu, Jun , Li, Xiaojun , Liang, Jianwen , Kontoe, Stavroula , He, Qiumei , Chen, Su . Effects of pulse-like ground motions on tunnels in saturated poroelastic soil for obliquely incident seismic waves . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2023 , 173 .
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Inversion method for velocity structure of soil layers by ambient noise and its application SCIE
期刊论文 | 2023 , 66 (2) , 530-545 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
WoS CC Cited Count: 2
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Abstract :

The diffuse field theory can comprehensively consider the contributions of various types of wave fields in ambient noise. The noise horizontal-to-vertical spectral ratio (NHV) based on diffuse field theory links surface observation with an intrinsic property of the underground medium. Naturally, it allows for the inversion of the velocity structure of soil layers. There is an urgent need to develop fast and effective NHV inversion tools to estimate velocity structure for soil layers. Combining the genetic-simulated annealing algorithm and forward calculation of NHV based on diffuse field theory, we proposed a global inversion method to determine the velocity structure of soil layers. The sensitivity analysis of the model parameters shows that the Vp, Vs and h of the soil layer and the Vs of the rock layer are the main affecting factors of NHV, the influence of the density of soil and rock layers on NHV can be ignored. Through the verification of synthetic cases, the observation of the Xiangtang vertical array, and comparison with a similar method, we have proved that good inversion results can be obtained using our proposed method. This proposed method can offer an efficient and low-cost way to estimate site velocity structures.

Keyword :

Noise horizontal-to-vertical spectral ratio (NHV) Noise horizontal-to-vertical spectral ratio (NHV) Inversion Inversion Velocity structure Velocity structure Soil layers Soil layers Ambient noise Ambient noise

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GB/T 7714 Rong MianShui , Wang JiXin , Li XiaoJun et al. Inversion method for velocity structure of soil layers by ambient noise and its application [J]. | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION , 2023 , 66 (2) : 530-545 .
MLA Rong MianShui et al. "Inversion method for velocity structure of soil layers by ambient noise and its application" . | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 66 . 2 (2023) : 530-545 .
APA Rong MianShui , Wang JiXin , Li XiaoJun , Liu AoYi , Kong XiaoShan , Li Hang . Inversion method for velocity structure of soil layers by ambient noise and its application . | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION , 2023 , 66 (2) , 530-545 .
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Analysis of site amplification coefficient characteristics of Sichuan and its application in strong ground-motion simulation: A case study of 2022 Lushan M(S)6.1 earthquake SCIE
期刊论文 | 2023 , 66 (7) , 2933-2950 | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
WoS CC Cited Count: 5
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Abstract :

Following the site classification methods proposed the Chinese seismic code (Code16) and the Next Generation Attenuation (GMX), the site conditions of 62 strong motion observation stations located in Sichuan, China were classified based on their site conditions. Then, the site amplification coefficients and high-frequency attenuation parameters (kappa(0)) of these selected stations were used to investigate the local site effect characteristics of each site classes in average sense. The result shows that, in the range of Code16 site class II, at frequencies above 10 Hz, the amplification of GMX site class C is significantly enhanced by the topographical effect due to narrow mountainous valley site condition; whereas at frequencies below 5 Hz, the amplification of GMX site class D is noticeably enhanced by the deep soft sediments. Considering the source slip model, the differences of quality factor between mountainous and basin aeras, the local site effects, and the average stress drop of regional aftershocks, the acceleration time series, Fourier Amplitude spectrum (FAS) and 5%-damped pseudo-spectral acceleration (PSA) of 9 stations located within 100 km rupture distance (R-rup) range with respect to the 2022 Lushan M(S)6.1 earthquake were simulated using the stochastic finite-fault simulation method. The result shows that, the simulated time series fit well with the S-wave portion of observation. Moreover, at period shorter than 8 s, the shapes of simulated FAS and PSA matched those of observations. The satisfactory simulation result supported that the current earthquake is most likely to be an aftershock of the 2013 Lushan M(S)7.0 earthquake. Moreover, the simulation result captured the obvious directivity effect observed when R-rup < 35 km. Finally, taking the average site amplifications and kappa(0) values of each site classes into account, the attenuation characteristics with respect to R-rup of simulated and observed peak ground acceleration (PGA), peak ground velocity (PGV), and spectral acceleration at periods of 0.5 s, 1.0 s, 5.0 s, and 8.0 for 167 basin and 130 mountain stations with R-rup < 150 km were compared. The result indicates that, the attenuation rate of ground motion parameters and the levels of PGA and PGV of basin and mountain stations are similar. However, at period longer than 1.0 s, the spectral accelerations of basin are systematically larger than those of mountain area.

Keyword :

Directivity effect Directivity effect Strong ground motion Strong ground motion Lushan M(S)6.1 earthquake Lushan M(S)6.1 earthquake Site effect Site effect Stochastic finite-fault method Stochastic finite-fault method

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GB/T 7714 Fu Lei , Xie Junju , Chen Su et al. Analysis of site amplification coefficient characteristics of Sichuan and its application in strong ground-motion simulation: A case study of 2022 Lushan M(S)6.1 earthquake [J]. | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION , 2023 , 66 (7) : 2933-2950 .
MLA Fu Lei et al. "Analysis of site amplification coefficient characteristics of Sichuan and its application in strong ground-motion simulation: A case study of 2022 Lushan M(S)6.1 earthquake" . | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 66 . 7 (2023) : 2933-2950 .
APA Fu Lei , Xie Junju , Chen Su , Zhang Bin , Zhang Xu , Li Xiaojun . Analysis of site amplification coefficient characteristics of Sichuan and its application in strong ground-motion simulation: A case study of 2022 Lushan M(S)6.1 earthquake . | CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION , 2023 , 66 (7) , 2933-2950 .
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