Article
Geosciences, Multidisciplinary
Xianglong Yao, Shengwen Qi, Chunling Liu, Songfeng Guo, Xiaoling Huang, Chong Xu, Bowen Zheng, Zhifa Zhan, Yu Zou
Summary: The study introduces an empirical attenuation model that can accurately reconstruct the PGA distribution of earthquakes, especially in the near field. Comparisons with results from a finite-fault model demonstrate that the proposed model offers more details and a more precise outcome.
Article
Environmental Sciences
Yongzhe Wang, Kun Chen, Ying Shi, Xu Zhang, Shi Chen, Ping'en Li, Donghua Lu
Summary: An Mw 6.1 earthquake occurred in Yangbi County, Yunnan Province, China on May 21, 2021, resulting in significant seismic damage. Through the use of InSAR technique, the earthquake's surface deformation pattern, source characteristics, and strong ground motion were analyzed, revealing that the earthquake was dextral faulting with the maximum slip of 0.9 m on an unknown blind shallow fault, with a magnitude of 6.06.
Article
Chemistry, Multidisciplinary
Yushi Duan, Jingshan Bo, Da Peng, Qi Li, Wei Wan, Wenhao Qi
Summary: This paper investigates the peak ground acceleration and seismogenic fault characteristics of the 2023 earthquake in Turkey, providing important insights for seismic engineering and disaster prevention.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Civil
Wujian Yan, Xinxin Tian, Zhijian Wu, Wang Ping, Kang Lin
Summary: In this study, a two-dimensional numerical model of Sulphur Gully Bridge and its site soil was established, and finite element dynamic time analysis was used to investigate the dynamic response characteristics of the bridge's box girder, pier, pile foundation, and site under ground motion loads. The results indicate that the peak acceleration and displacement decrease linearly with height, the difference between vertical and horizontal displacement is about 5-13.6 times, the frequency content of the bridge's ground motion is concentrated in 1-10 Hz with a main frequency of 2 Hz, and the peak Fourier spectrum of ground motion is higher in the structure and decreases as the height decreases.
Article
Environmental Sciences
Erdem Bayrak, Kaan Hakan Coban
Summary: In this study, the Bozkurt earthquake in Turkey was analyzed by comparing the recorded peak ground acceleration (PGA) values with different ground-motion prediction equations (GMPEs). The stress tensor and Coulomb stress variations before and after the earthquake were examined, revealing that the mainshock occurred in a positive stress area and the majority of aftershocks occurred in areas with high stress. The seismic hazard assessment and earthquake risk mitigation studies can benefit from these stress variations.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Mechanics
Cengizhan Durucan, Humeyra Sahin, Ayse Rusen Durucan
Summary: This study aims to develop a new seismic intensity measure based on the shape of the response spectrum and the spectral acceleration at the fundamental elastic period of the structure, specifically for short period reinforced concrete structures subjected to near-fault pulse-like ground motion records. The proposed measure shows improved performance compared to other evaluated measures.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Green & Sustainable Science & Technology
Jiangwei Zhang, Yan Shen, Tao Lu, Ying Yuan, Chengda Zhang
Summary: This study used the finite element method to simulate the influence of effective peak acceleration (EPA) on the seismic response of soil slopes. Four different definitions of EPA commonly used in domestic and foreign codes were discussed and compared with the influence of peak acceleration (PGA). The results showed that the deformation and maximum principal stress of soil slopes were positively correlated with EPA and PGA, with different correlation degrees depending on the definitions used. EPA1 by the first definition had the highest correlation with the soil slope seismic response, followed by PGA. EPA2, EPA3, and EPA4 had lower correlation coefficients. EPA1 and PGA were found to better describe the response degree of soil slopes in earthquakes. These findings provide a basis for selecting seismic parameters in the evaluation of soil slope seismic stability.
Article
Engineering, Geological
Victor M. M. Hernandez-Aguirre, Rajesh Rupakhety, Simon Olafsson, Bjarni Bessason, Sigurour Erlingsson, Roberto Paolucci, Chiara Smerzini
Summary: The eruptions at Mt. Fagradalsfjall were preceded by intense volcano-tectonic swarms, resulting in strong ground motion with a PGA of 0.45 g. These observations indicate that volcanic events and tectonic earthquakes in Iceland have different characteristics in terms of ground motion. Therefore, it is important to consider these differences in seismic hazard and risk assessment in Iceland.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Geosciences, Multidisciplinary
Gokhan Altay, Cafer Kayadelen, Mehmet Kara
Summary: This study focuses on the model selection and prediction of PGA, PGV, and PGD using strong motion data from earthquakes in Turkiye. The results indicate that the gradient boosted model (GBM) outperforms other models and the artificial neural network (ANN) technique in predicting PGA, and is capable of capturing the complex relationship between the predicted values and input parameters.
Article
Engineering, Geological
S. Sangeetha, S. T. G. Raghukanth
Summary: This study presents the simulation of broadband ground motions for historical earthquakes in Northeast India using a geology-based velocity model and a hybrid approach. The results show that this method provides an accurate estimation of site-specific ground motions and reproduces the prominent features of observed motions. The obtained ground motions are useful for seismic design and hazard estimation.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Geochemistry & Geophysics
Anjali Sharma, Dinesh Kumar, Ajay Paul, Satybir Singh Teotia
Summary: In this study, the 1991 Uttarkashi (M 7) and 1999 Chamoli (M 6.6) earthquakes were simulated using a modified hybrid technique. The simulated results were found to match the observed results, indicating the effectiveness of this technique in seismic hazard assessment and earthquake-resistant building design.
Article
Geochemistry & Geophysics
Peiliang Xu, Fang Du, Yuanming Shu, Hongping Zhang, Yun Shi
Summary: This study focuses on reconstructing velocity and acceleration from high sampling rate (50 Hz) precise GNSS data, proposing a regularization method based on minimum mean squared errors (MSE). The reconstructed velocity and acceleration values are shown to be in good agreement with the earthquake signal and motion patterns in the position waveforms.
JOURNAL OF GEODESY
(2021)
Article
Geochemistry & Geophysics
Yoshiaki Hisada, Shinya Tanaka
Summary: This study presents the theory of the fling step and a method for accurately simulating near-fault strong motions. The theory is shown to hold for any seismic velocity structure, and the method is demonstrated to be effective in reproducing various strong-motion records near surface fault ruptures. This work contributes to the understanding and simulation of near-fault ground motions.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Civil
R. Ramkrishnan, Kolathayar Sreevalsa, T. G. Sitharam
Summary: A new region-specific Ground Motion Prediction Equation (GMPE) was developed for the North and Central Himalayas based on recorded strong motion data. It was found to predict ground acceleration more accurately with noticeably less residuals compared to existing GMPEs, overcoming limitations of previous equations.
JOURNAL OF EARTHQUAKE ENGINEERING
(2021)
Article
Geosciences, Multidisciplinary
Kapil Mohan, Babita Sharma, O. P. Mishra
Summary: This study attempts to resolve the source, path, and site characterization issues of the 1803 Garhwal-Kumaon Himalaya earthquake by estimating peak ground accelerations and correlation between estimated and reported intensities. The study suggests that the earthquake occurred at a depth of 20 km in the least seismic attenuation zone with a magnitude of 8.1.
EARTH-SCIENCE REVIEWS
(2023)
Article
Engineering, Geological
Timothy G. Cork, Jung Han Kim, George P. Mavroeidis, Jae Kwan Kim, Benedikt Halldorsson, Apostolos S. Papageorgiou
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2016)
Article
Engineering, Geological
Francesco Panzera, Benedikt Halldorsson, Kristin Vogfjoro
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2017)
Article
Environmental Sciences
Sahar Rahpeyma, Benedikt Halldorsson, Birgir Hrafnkelsson, Sigurjon Jonsson
Article
Engineering, Geological
Milad Kowsari, Benedikt Halldorsson, Birgir Hrafnkelsson, Jonas Thor Snaebjornsson, Sigurjon Jonsson
BULLETIN OF EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
Milad Kowsari, Benedikt Halldorsson, Birgir Hrafnkelsson, Sigurjon Jonsson
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
Sahar Rahpeyma, Benedikt Halldorsson, Birgir Hrafnkelsson, Russell A. Green, Sigurjon Jonsson
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
Tim Sonnemann, Benedikt Halldorsson, Sigurjon Jonsson
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
S. Yang, G. P. Mavroeidis, J. C. de la Llera, A. Poulos, P. Aguirre, S. Rahpeyma, T. Sonnemann, B. Halldorsson
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2019)
Article
Engineering, Geological
Milad Kowsari, Tim Sonnemann, Benedikt Halldorsson, Birgir Hrafnkelsson, Jonas P. Snaebjornsson, Sigurjon Jonsson
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2020)
Article
Geochemistry & Geophysics
Zoya Farajpour, Milad Kowsari, Shahram Pezeshk, Benedikt Halldorsson
Summary: In this study, three data-driven selection methods were applied to evaluate the predictive capability of ground-motion models against a new data set, with the DIC method showing advantages in terms of objective representation.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Civil
Sahar Rahpeyma, Benedikt Halldorsson, Birgir Hrafnkelsson, Sigurjon Jonsson
Summary: The ground-motion amplitudes of over 1700 earthquakes recorded in south Iceland exhibit a significant spatial variation, particularly in the period range of 0.1-0.3 seconds. These findings are important for improving earthquake hazard assessments and engineering decision-making.
EARTHQUAKE SPECTRA
(2022)
Article
Engineering, Geological
Milad Kowsari, Benedikt Halldorsson, Jonas Thorn Snaebjornsson, Sigurjon Jonsson
Summary: This study re-evaluates seismic hazard in North Iceland with new ground motion models, highlighting the potential shortcomings of previous models in capturing the characteristics of Icelandic earthquake ground motion. The results indicate a significant increase in confidence of hazard estimates using the new models.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Geological
Sahar Rahpeyma, Benedikt Halldorsson, Birgir Hrafnkelsson, Atefe Darzi
Summary: A fundamental assumption in engineering seismology is that seismic ground motion is influenced by source, propagation path, and site effects. However, comprehensive studies on site effects in Iceland, specifically the localized amplification effects due to the uppermost geological structure, have been limited. In this study, a new Bayesian hybrid GMM is used to model ground motions in southwest Iceland, incorporating peak ground acceleration and pseudo-acceleration response spectra. By inspecting the systematic behavior of station term residuals, four groups of station terms are proposed based on their characteristics. Additionally, the first frequency-dependent average site amplification functions associated with key geological units in Iceland are proposed. The updated GMM with these amplification functions enables site-specific ground motion prediction and improves seismic hazard assessment and engineering decision making in Iceland.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Tim Sonnemann, Benedikt Halldorsson, Birgir Hrafnkelsson, Sigurjon Jonsson
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2020)
Article
Engineering, Geological
R. Rupakhety, S. Olafsson, B. Halldorsson
BULLETIN OF EARTHQUAKE ENGINEERING
(2017)
Article
Engineering, Geological
Shaohui Liu, Lizhong Jiang, Wangbao Zhou, Jian Yu
Summary: This study evaluates the post-earthquake damage to track-bridge systems by conducting nonlinear time history analysis on a CRTS II ballastless track simply-supported beam system subjected to transverse earthquake loading. It explores the characteristics of residual displacement and stiffness degradation of the track-bridge system under transverse earthquakes. The research investigates the effect of earthquake-induced stiffness degradation on high-speed trains and proposes a reconstruction method for earthquake-induced dynamic irregularity characteristic curve considering probability guarantee rates. The results indicate that earthquake-induced dynamic irregularity can effectively quantify the running performance of high-speed trains under earthquake-induced stiffness degradation conditions.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Rui Zhang, Xiangqian Sheng, Wenliang Fan
Summary: This study introduces a novel approach for the probabilistic assessment of seismic earth pressure against nonlinear backfills. Nonlinear upper bound analysis is used to obtain the seismic earth pressure through optimization procedure, and probability analysis of nonlinear backfill properties is considered by combining adaptive dimension decomposition with the direct integral method.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Qiangqiang Sun, Yu Xue, Menghao Hou
Summary: This study investigated the use of Tire-derived aggregate (TDA) as backfill material for geotechnical seismic isolation in utility tunnels. Nonlinear numerical analyses were conducted, and the results showed that TDA backfill was an excellent alternative for risk mitigation during strong earthquakes, significantly reducing deformation and forces. The proposed system could potentially save costs compared to expensive seismic mitigation measures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Yan-Guo Zhou, Dong-Chao Zhang, Kai Liu, Yun-Min Chen
Summary: This study investigated the large deformations caused by liquefaction in sloping ground and the methods for evaluation and mitigation. Soil element tests and centrifuge model tests were conducted to study the relationship between residual strain and Post-liquefaction Deformation Potential (PLDP). The tests showed that the developments of residual strain were controlled by PLDP, which is correlated with the maximum cyclic shear strain. The applicability of PLDP was verified in model tests, and the mitigation mechanisms of densification and drainage induced by stone columns were observed.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jiajin Zhao, Zhehao Zhu, Dexuan Zhang, Hao Wang, Xi Li
Summary: This paper studies the fabric properties during sand liquefaction using 3D constant-volume cyclic triaxial DEM tests. The results show good consistency with experimental data. The evolution of fabric characteristics is assessed using the coordination number and mechanical coordination number. The second-order contact normal fabric tensor is introduced to analyze complex inter-particle contacts and the shear strain is used as a bridge to describe the evolution of coordination number and anisotropy degree.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jinqiang Li, Zilan Zhong, Shurui Wang, Kaiming Bi, Hong Hao
Summary: The corrosion-protection liner technology improves the seismic performance of water supply pipelines and reduces the failure probability under earthquake excitations.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Abdellah Cherif Taiba, Youcef Mahmoudi, Mostefa Belkhatir
Summary: This article provides a comprehensive analysis of Liu et al.'s (2023) published paper in the Soil Dynamics and Earthquake Engineering journal, which examines the impact of particle shape on the wave velocity of sand. By enhancing the content integrity, this article serves as a valuable discussion piece for readers interested in this research topic.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Weijian Zhong, Binbin Li, Yanhui Liu, Ping Tan, Fulin Zhou
Summary: In this paper, the Flexible Limit Protective Device (FLPD) was improved to a Flexible Energy Dissipating Device (FEDD) to better control the seismic response of base-isolated structures. Experimental investigation and numerical simulation were conducted to study the compression behavior and optimize the design of FEDDs. The results showed that FEDDs with optimal parameters effectively reduced isolator displacements and kept the inter-story drift angle within a safe range during earthquakes.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Xinhua Xue, Xiaojie Yuan, Li Tao
Summary: In this study, gene expression programming (GEP) was used to establish the relationship between the capacity energy required to trigger sand liquefaction and several major parameters. The GEP model showed higher accuracy and better performance compared to existing models, as confirmed by experimental data.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Xiao-ling Zhang, Hao Lan, Xian-hui Zhao, Cheng-shun Xu, Ke-min Jia
Summary: The study investigates the reinforcement principle of inclined liquefiable site using concrete pile and gravel pile methods. The results show that concrete piles have a better reinforcement effect on inclined liquefiable site compared to gravel piles, and increasing the diameter of gravel piles greatly improves the reinforcement effect. The pile group reinforcement model is more effective in reducing lateral displacement of the site soil compared to the single pile reinforcement model.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jinxin Sun, Haoyu Sun, Mengmeng Lu, Bolin Han
Summary: The implementation of stone columns is an effective way to improve the stability of liquefiable soil. However, existing mathematical models often neglect vertical seepage within the soil, leading to calculation errors. This study proposes a new mathematical model that considers both radial and vertical seepage, and conducts a parameter analysis to investigate the effects of column spacing, cyclic stress ratio, and consolidation parameters on excess pore water pressure.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jonathan F. Hubler, James P. Hanley, Andrew C. Stolte, Liam Wotherspoon, Kyle M. Rollins
Summary: This study performed blast liquefaction tests in an area that experienced extensive liquefaction. It used multi-channel analysis of surface waves (MASW) testing to evaluate changes in shear wave velocity (VS) before and after blasting. The study found that array length has an impact on the immediate changes in VS following blasting, but these changes decrease at 24 hours post-blast.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Lowell Tan Cabangon, Gaetano Elia, Mohamed Rouainia, Suraparb Keawsawasvong, Teraphan Ornthammarath
Summary: The impact of far-field earthquakes on underground structures, especially tunnels, has been relatively less explored compared to near-field earthquakes. However, the study found that far-field earthquakes can generate forces in tunnel lining that are equally destructive as those induced by near-field motions, especially when they contain long-period waves. The amplification of these ground motions in soft natural clays, common in Bangkok, can lead to significant soil displacements and shear strains.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Jinjun Hu, Longbing Ding, Xutong Zhou, Mingji Liu, Jingyang Tan
Summary: Offshore near-fault ground motions during the 2016 OffMie Mw6.0 earthquake in the Nankai Trough of Japan were studied using data from the DONET1 seafloor seismic network. The results show that offshore spectral acceleration and peak ground velocity are higher than onshore values. Analysis of pulse-like ground motions reveals differences in amplitude, frequency content, and energy between offshore and onshore motions. These findings have implications for seismic design of offshore engineering structures.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)
Article
Engineering, Geological
Radu Popescu, Pradipta Chakrabortty
Summary: The natural spatial variability of soil properties affects the mechanical response of geotechnical structures and can deviate failure surfaces. For soil liquefaction induced by seismic activity, it has been found that greater excess pore water pressure is generated in soils with small-scale variability. This paper provides an explanation based on centrifuge experiments and numerical simulations, showing that partial drainage during earthquakes may trigger softening of dilative soils.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2024)