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<p>Arunachal Pradesh, located in northeastern India, is a region prone to earthquakes due to tectonic movements from the Himalayan collision zone and the Indo-Myanmar subduction zone. This study presents a comprehensive seismic hazard analysis of Arunachal Pradesh, employing updated earthquake data and a logic tree approach. Earthquake data from multiple sources and fault parameters from the seismotectonic atlas were analyzed. Seismicity parameters and maximum magnitude are estimated for each source. Utilizing both deterministic seismic hazard analysis (DSHA) and probabilistic seismic hazard analysis (PSHA) methods, peak ground acceleration (PGA) values were calculated for various districts, identifying critical faults contributing to seismic activity. Uniform hazard spectra (acceleration, velocity, displacement) were developed, and seismic hazard curves and maps were generated for each district of Arunachal Pradesh to illustrate varying levels of seismic risk. The results show that the peak ground acceleration (PGA) values range from 0.42 to 1.08g in the DSHA method, 0.22–0.49 for DBE (design basis earthquake – 475&#xa0;yr), and 0.42–1.08g for MCE (maximum considered earthquake – 2475&#xa0;yr) recurrence interval in the PSHA method, significantly exceeding IS 1893:2016 standards. Sagaing, Lohit, Sylhet, and Samin Faults are identified as critical seismic sources, with West Kameng, Namsai, Lohit, and Lower Dibang Valley at the highest risk. Pushover analysis reveals that seismic demands exceed Indian standards by up to 105%, emphasizing the need for revised design parameters. The findings align with the UN Sustainable Development Goals (SDG), emphasizing resilient infrastructure, disaster preparedness, and policy collaboration to enhance seismic safety in high-risk areas. The results underscore the necessity for updated seismic design codes to ensure structures can withstand the identified seismic risks effectively.</p>

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Seismic hazard mapping of Arunachal Pradesh: Integrating updated data and logic tree methodology

  • 期刊论文

  • 发表日期：

    2025年7月24日

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  • Aman Kumar,
  • Satyaprakash Mishra,
  • Arjun Sil

摘要

Arunachal Pradesh, located in northeastern India, is a region prone to earthquakes due to tectonic movements from the Himalayan collision zone and the Indo-Myanmar subduction zone. This study presents a comprehensive seismic hazard analysis of Arunachal Pradesh, employing updated earthquake data and a logic tree approach. Earthquake data from multiple sources and fault parameters from the seismotectonic atlas were analyzed. Seismicity parameters and maximum magnitude are estimated for each source. Utilizing both deterministic seismic hazard analysis (DSHA) and probabilistic seismic hazard analysis (PSHA) methods, peak ground acceleration (PGA) values were calculated for various districts, identifying critical faults contributing to seismic activity. Uniform hazard spectra (acceleration, velocity, displacement) were developed, and seismic hazard curves and maps were generated for each district of Arunachal Pradesh to illustrate varying levels of seismic risk. The results show that the peak ground acceleration (PGA) values range from 0.42 to 1.08g in the DSHA method, 0.22–0.49 for DBE (design basis earthquake – 475 yr), and 0.42–1.08g for MCE (maximum considered earthquake – 2475 yr) recurrence interval in the PSHA method, significantly exceeding IS 1893:2016 standards. Sagaing, Lohit, Sylhet, and Samin Faults are identified as critical seismic sources, with West Kameng, Namsai, Lohit, and Lower Dibang Valley at the highest risk. Pushover analysis reveals that seismic demands exceed Indian standards by up to 105%, emphasizing the need for revised design parameters. The findings align with the UN Sustainable Development Goals (SDG), emphasizing resilient infrastructure, disaster preparedness, and policy collaboration to enhance seismic safety in high-risk areas. The results underscore the necessity for updated seismic design codes to ensure structures can withstand the identified seismic risks effectively.