Scholarlink

<p>The high pressure Guwahati–Siliguri Pipeline (GSPL) passes through the&#xa0;densely populated Guwahati city in northeast India. This study evaluates response of the GSPL segment within Guwahati city with a focus on the effect of seismic wave induced failure. Seismic sources within a 500&#xa0;km radius of the&#xa0;Guwahati city are identified and classified into four seismic source regions of (1) Shillong Seismogenic Zone (SSZ), (2) Indo-Burmese Orogenic Front (IBOF), (3) Bengal Deltaic Seismic Block (BDSB), and (4) Eastern Himalayan Seismotectonic Belt (EHSB). The <i>b-value</i>s are 1.00 ± 0.03 (SSZ), 1.03 ± 0.02 (IBOF), 0.66 ± 0.06 (BDSB), and 0.93 ± 0.02 (EHSB), indicating elevated seismic activity in BDSB. Deterministic Seismic Hazard Assessment (DSHA) reveal Oldham fault as the source for high level of ground shaking. Peak Ground Accelerations at bedrock level (PGA<sub>b</sub>) obtained from DSHA range between 0.219&#xa0;g to 0.239&#xa0;g. Probabilistic Seismic Hazard Assessment (PSHA) results reveal that for 2% probability of exceedance in 50&#xa0;years the PGA<sub>b</sub> range between 0.202&#xa0;g to 0.242&#xa0;g. At 10% probability of exceedance in 50&#xa0;years the PGA<sub>b</sub> range between 0.126&#xa0;g to 0.146&#xa0;g. Hazard curves identify Kopili fault as the contributor for high levels of ground motion at Guwahati city. Further, the study shows that the cumulative strain experienced by the GSPL as a result of tension against axial strain due to seismic wave passage remains below the allowable limit of 3% for worst case scenario, 2% probability of exceedance in 50&#xa0;years as well as 10% probability of exceedance in 50&#xa0;years.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Deterministic and probabilistic seismic hazard assessment and strain evaluation along the Guwahati–Siliguri Pipeline

  • 期刊论文

  • 发表日期：

    2025年12月2日

查看全文
  • Olympa Baro,
  • Sushma Brahma

摘要

The high pressure Guwahati–Siliguri Pipeline (GSPL) passes through the densely populated Guwahati city in northeast India. This study evaluates response of the GSPL segment within Guwahati city with a focus on the effect of seismic wave induced failure. Seismic sources within a 500 km radius of the Guwahati city are identified and classified into four seismic source regions of (1) Shillong Seismogenic Zone (SSZ), (2) Indo-Burmese Orogenic Front (IBOF), (3) Bengal Deltaic Seismic Block (BDSB), and (4) Eastern Himalayan Seismotectonic Belt (EHSB). The b-values are 1.00 ± 0.03 (SSZ), 1.03 ± 0.02 (IBOF), 0.66 ± 0.06 (BDSB), and 0.93 ± 0.02 (EHSB), indicating elevated seismic activity in BDSB. Deterministic Seismic Hazard Assessment (DSHA) reveal Oldham fault as the source for high level of ground shaking. Peak Ground Accelerations at bedrock level (PGAb) obtained from DSHA range between 0.219 g to 0.239 g. Probabilistic Seismic Hazard Assessment (PSHA) results reveal that for 2% probability of exceedance in 50 years the PGAb range between 0.202 g to 0.242 g. At 10% probability of exceedance in 50 years the PGAb range between 0.126 g to 0.146 g. Hazard curves identify Kopili fault as the contributor for high levels of ground motion at Guwahati city. Further, the study shows that the cumulative strain experienced by the GSPL as a result of tension against axial strain due to seismic wave passage remains below the allowable limit of 3% for worst case scenario, 2% probability of exceedance in 50 years as well as 10% probability of exceedance in 50 years.