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<p>This study investigates the seismic response of 22 selected locations across the Itanagar region using equivalent linear ground response analysis (ELGRA). The analysis incorporates shear wave velocity data obtained from active multichannel analysis of surface waves (MASW) field tests as input parameters for ELGRA. Four distinct acceleration–time histories were used as strong motion inputs to consider a wide range of peak bedrock acceleration (PBA) ranging from 0.026 to 0.82 g. The results reveal the significant spatial variability in ground response parameters such as peak ground acceleration (PGA), amplification factor, displacement, shear strain, spectral acceleration (SA), and shear stress ratio profiles. The surface PGA in the Itanagar city is found to be within the range of 0.064–1.71 g, along with the amplification factors varying between 0.4 and 11. For motions with PBA more than 0.343 g, a few locations in the city exhibited deamplification as well, thereby lowering the influence of the higher seismic energy imparted by the chosen motion. The study successfully highlights the variability of peak spectral acceleration (PSA) in the region, especially identifying the locations manifesting higher magnitudes of PSA. The identified period bandwidths at different locations of high PSA (0.05–0.2 sec for lower PBA motions and 0.2–0.4 sec for higher PBA motions) indicate the potential vulnerability of infrastructures with approximately similar natural periods. The variability of spectral acceleration within the region corresponding to the periods of 0.1, 0.3, and 0.5 sec clearly demarcated the locations where buildings with specific heights would be subjected to higher seismic forces. This study provides valuable insights into the seismic response of the Itanagar region, highlighting the importance of site-specific geological conditions in influencing ground motion amplification. The findings of this analysis can be efficiently utilized to develop seismic resilient structures and enhance seismic risk management strategies in the region.</p>

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Seismic assessment of Itanagar city, Arunachal Pradesh, India: ELGRA studies incorporating spatially variable subsurface stratification derived from active MASW survey

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Aditya Kumar Anshu,
  • Arindam Dey,
  • Shiv Shankar Kumar,
  • Jumrik Taipodia

摘要

This study investigates the seismic response of 22 selected locations across the Itanagar region using equivalent linear ground response analysis (ELGRA). The analysis incorporates shear wave velocity data obtained from active multichannel analysis of surface waves (MASW) field tests as input parameters for ELGRA. Four distinct acceleration–time histories were used as strong motion inputs to consider a wide range of peak bedrock acceleration (PBA) ranging from 0.026 to 0.82 g. The results reveal the significant spatial variability in ground response parameters such as peak ground acceleration (PGA), amplification factor, displacement, shear strain, spectral acceleration (SA), and shear stress ratio profiles. The surface PGA in the Itanagar city is found to be within the range of 0.064–1.71 g, along with the amplification factors varying between 0.4 and 11. For motions with PBA more than 0.343 g, a few locations in the city exhibited deamplification as well, thereby lowering the influence of the higher seismic energy imparted by the chosen motion. The study successfully highlights the variability of peak spectral acceleration (PSA) in the region, especially identifying the locations manifesting higher magnitudes of PSA. The identified period bandwidths at different locations of high PSA (0.05–0.2 sec for lower PBA motions and 0.2–0.4 sec for higher PBA motions) indicate the potential vulnerability of infrastructures with approximately similar natural periods. The variability of spectral acceleration within the region corresponding to the periods of 0.1, 0.3, and 0.5 sec clearly demarcated the locations where buildings with specific heights would be subjected to higher seismic forces. This study provides valuable insights into the seismic response of the Itanagar region, highlighting the importance of site-specific geological conditions in influencing ground motion amplification. The findings of this analysis can be efficiently utilized to develop seismic resilient structures and enhance seismic risk management strategies in the region.