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<p>Local geological and geotechnical characteristics significantly influence the amplitude, frequency, and duration of ground motion at a site. Variations in soil deposits can either amplify or attenuate ground motion. This study introduces a refined methodology for estimating the peak ground acceleration (PGA) at the bedrock level using a probabilistic seismic hazard approach tailored to urban settings. It evaluates the site response in Bhubaneswar, the capital city of Odisha, using a 1D equivalent ground response analysis (<i>EQL-GRA</i>) method. To conduct the study, 32 borehole locations were selected in the region, representing a comprehensive spatial coverage that enhances the granularity of seismic response insights. By employing locally derived correlations for standard penetration test (<i>SPT-N</i>) values and shear wave velocities (<i>V</i><sub>s</sub>), the study innovatively adjusts traditional models to better fit the specific geotechnical context of Bhubaneswar. The <i>DEEPSOIL</i> software, customized for the specific seismic and soil conditions of the study area, was used for the analysis, and the results are presented in terms of surface-level <i>PGA</i>, amplification factor, surface-level time-history acceleration plots, Fourier amplitude ratio, amplification versus depth, spectral acceleration, and spatial variation of <i>PGA</i> and spectral acceleration values. The analysis revealed that surface-level <i>PGA</i> varies from 0.07 to 0.11&#xa0;g, with amplification factors ranging from 1.25 to 1.80. Depending on the soil materials present at various depths, the <i>GRA</i> results also showed deamplification of seismic waves at certain locations. The maximum spectral acceleration ranges from 0.27 to 0.53&#xa0;g, with amplification factors from 2.21 to 5.21. These novel findings provide crucial data for designers, planners, and engineers focused on developing earthquake-resistant infrastructure, particularly in Bhubaneswar city and regions with similar geotechnical and seismic profiles as Bhubaneswar.</p>

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Site-Specific Ground Response Assessment of Bhubaneswar City, India, Using 1D Equivalent Linear Analysis: A Case Study

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Satyaprakash Mishra,
  • Arjun Sil,
  • Amit Kumar Das

摘要

Local geological and geotechnical characteristics significantly influence the amplitude, frequency, and duration of ground motion at a site. Variations in soil deposits can either amplify or attenuate ground motion. This study introduces a refined methodology for estimating the peak ground acceleration (PGA) at the bedrock level using a probabilistic seismic hazard approach tailored to urban settings. It evaluates the site response in Bhubaneswar, the capital city of Odisha, using a 1D equivalent ground response analysis (EQL-GRA) method. To conduct the study, 32 borehole locations were selected in the region, representing a comprehensive spatial coverage that enhances the granularity of seismic response insights. By employing locally derived correlations for standard penetration test (SPT-N) values and shear wave velocities (Vs), the study innovatively adjusts traditional models to better fit the specific geotechnical context of Bhubaneswar. The DEEPSOIL software, customized for the specific seismic and soil conditions of the study area, was used for the analysis, and the results are presented in terms of surface-level PGA, amplification factor, surface-level time-history acceleration plots, Fourier amplitude ratio, amplification versus depth, spectral acceleration, and spatial variation of PGA and spectral acceleration values. The analysis revealed that surface-level PGA varies from 0.07 to 0.11 g, with amplification factors ranging from 1.25 to 1.80. Depending on the soil materials present at various depths, the GRA results also showed deamplification of seismic waves at certain locations. The maximum spectral acceleration ranges from 0.27 to 0.53 g, with amplification factors from 2.21 to 5.21. These novel findings provide crucial data for designers, planners, and engineers focused on developing earthquake-resistant infrastructure, particularly in Bhubaneswar city and regions with similar geotechnical and seismic profiles as Bhubaneswar.