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<p>Subsoil present between bedrock and the surface plays a very important role in amplifying bedrock motion generated during an earthquake (EQ). This can happen even at larger hypocentral distance, and is responsible for significant building damages. In the present work, local soil of Madhubani and adjoining region is studied by means of in-situ investigations consisting of 20 boreholes drilling and geophysical investigations based on Multichannel Analysis of Surface Waves (MASW) tests at 50 locations. The region is located adjacent to seismically active Himalayan belt, and has experience significant building damages as well as liquefaction during 1833 Bihar-Nepal EQ, 1934 Bihar-Nepal EQ and even during 2015 Nepal EQ. In the light of damages witnessed during 1934 EQ, sites selection for above investigations is done. Based on subsoil information, two typical stratification cross-sections are developed suggesting the presence of silty clay of medium plasticity (CI), silty clay of low plasticity (CL), silty sand (SM), poorly graded sand (SP), clayey silt of medium plasticity (MI), sandy silt (ML), poorly graded gravel (GP) and mixtures of poorly graded sand and silt (SM-SP). Subsequently, seismic site classification map for the study region are also developed. In addition, regional correlation between Standard Penetration Test (SPT) N value and shear wave velocity (Vs) are also developed for the study region of Madhubani and adjoining area, which is first of its kind for the region. Proposed correlation is validated using two approaches and can be used to assess surface seismic hazard during future works.</p>

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Seismic Site Classification, Stratigraphy Assessment and SPT-Vs Correlation for Madhubani and Adjoining Regions of Bihar Based on In-Situ Geotechnical and MASW Investigations

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Abhileen Chatterjee,
  • Hrik Chaudhury,
  • R. V. S. Jenny Laura,
  • Aman Alok,
  • Abhishek Kumar

摘要

Subsoil present between bedrock and the surface plays a very important role in amplifying bedrock motion generated during an earthquake (EQ). This can happen even at larger hypocentral distance, and is responsible for significant building damages. In the present work, local soil of Madhubani and adjoining region is studied by means of in-situ investigations consisting of 20 boreholes drilling and geophysical investigations based on Multichannel Analysis of Surface Waves (MASW) tests at 50 locations. The region is located adjacent to seismically active Himalayan belt, and has experience significant building damages as well as liquefaction during 1833 Bihar-Nepal EQ, 1934 Bihar-Nepal EQ and even during 2015 Nepal EQ. In the light of damages witnessed during 1934 EQ, sites selection for above investigations is done. Based on subsoil information, two typical stratification cross-sections are developed suggesting the presence of silty clay of medium plasticity (CI), silty clay of low plasticity (CL), silty sand (SM), poorly graded sand (SP), clayey silt of medium plasticity (MI), sandy silt (ML), poorly graded gravel (GP) and mixtures of poorly graded sand and silt (SM-SP). Subsequently, seismic site classification map for the study region are also developed. In addition, regional correlation between Standard Penetration Test (SPT) N value and shear wave velocity (Vs) are also developed for the study region of Madhubani and adjoining area, which is first of its kind for the region. Proposed correlation is validated using two approaches and can be used to assess surface seismic hazard during future works.