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<p>This study evaluates the seismic performance of the Mewa Khola Hydroelectric Project (MKHEP) Powerhouse in Taplejung District, Nepal. A site-specific Probabilistic Seismic Hazard Analysis (PSHA) was carried out to assess earthquake risks and develop a hazard curve. Peak Ground Acceleration (PGA) was calculated for different earthquake scenarios and return periods. In this study, an effort has been made to better understand the seismic hazard by considering area sources with varying densities. These densities are based on real historical earthquake records that reflect the actual seismicity of the region. To do this, separate earthquake densities were calculated using the kernel estimation method. This method takes into account not just how many earthquakes have occurred, but also how large they were, based on both historical data and the maximum magnitudes. Similarly, uniform density for all seismic sources was calculated, and a logic tree with different weightages was provided for seismic hazard analysis. For the powerhouse site, the Design Basis Earthquake (DBE) with a return period of 475&#xa0;years, the PGA was found to be 0.55&#xa0;g. A response spectrum specific to the site was generated and compared with spectra from the Bureau of Indian Standards (IS1893:2016) and Nepal Building Code (NBC 105:2020). The results show that the site PGA exceeds the value specified in NBC 105:2020, suggesting that the national building code may underestimate seismic demands for this location.</p>

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Site specific seismic hazard analysis of Mewa Khola power house site using density approach

  • 期刊论文

  • 发表日期：

    2026年3月3日

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  • Argen Karmacharya,
  • Hari Ram Parajuli

摘要

This study evaluates the seismic performance of the Mewa Khola Hydroelectric Project (MKHEP) Powerhouse in Taplejung District, Nepal. A site-specific Probabilistic Seismic Hazard Analysis (PSHA) was carried out to assess earthquake risks and develop a hazard curve. Peak Ground Acceleration (PGA) was calculated for different earthquake scenarios and return periods. In this study, an effort has been made to better understand the seismic hazard by considering area sources with varying densities. These densities are based on real historical earthquake records that reflect the actual seismicity of the region. To do this, separate earthquake densities were calculated using the kernel estimation method. This method takes into account not just how many earthquakes have occurred, but also how large they were, based on both historical data and the maximum magnitudes. Similarly, uniform density for all seismic sources was calculated, and a logic tree with different weightages was provided for seismic hazard analysis. For the powerhouse site, the Design Basis Earthquake (DBE) with a return period of 475 years, the PGA was found to be 0.55 g. A response spectrum specific to the site was generated and compared with spectra from the Bureau of Indian Standards (IS1893:2016) and Nepal Building Code (NBC 105:2020). The results show that the site PGA exceeds the value specified in NBC 105:2020, suggesting that the national building code may underestimate seismic demands for this location.