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The foreland-shaped Bengal Basin experiences recurrent seismic threats due to Eurasian-Indian tectonic plate collision. The present study appraises a site-specific surface-consistent probabilistic seismic hazard through site characterization of the Basin using geotechnical and geophysical database categorizing the Basin into eleven site classes with an amplification of 1.3–4.6 times resulting in a PGA range of 0.09–1.40 g for 10% probability of exceedance in 50 years. Holistic seismic microzonation and urban structural damage assessment performed on Asansol, Cuttack, Chittagong and Sylhet have also been presented.

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1D/2D Site Response Analysis of Bengal Basin for Assessing Surface-Consistent Probabilistic Seismic Hazard Vis-à-Vis Seismic Microzonation and Damage Potential Modeling of Asansol, Cuttack, Chittagong, and Sylhet

  • 会议论文

  • 发表日期：

    2025年

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  • A. Biswas,
  • S. K. Nath

摘要

The foreland-shaped Bengal Basin experiences recurrent seismic threats due to Eurasian-Indian tectonic plate collision. The present study appraises a site-specific surface-consistent probabilistic seismic hazard through site characterization of the Basin using geotechnical and geophysical database categorizing the Basin into eleven site classes with an amplification of 1.3–4.6 times resulting in a PGA range of 0.09–1.40 g for 10% probability of exceedance in 50 years. Holistic seismic microzonation and urban structural damage assessment performed on Asansol, Cuttack, Chittagong and Sylhet have also been presented.