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<p>The northeastern part of the Indian plate is undergoing a unique geological setting; two arcuated orogens such as collision And subduction meet in the extreme northeast corner to form the eastern syntaxial bend. Over the past 200&#xa0;years, these plate boundaries have caused numerous strong And great earthquakes, and the comprehensive study that followed led to the creation of modern seismology. During 2023, three moderate magnitude earthquakes with shallow focus (1) A 5.4&#xa0;M with 16&#xa0;km depth on 14 August 2023 in Bangladesh, (2) A 5.2&#xa0;M with depth of 10&#xa0;km on 2 October 2023 near North Garo Hills, Meghalaya, and (3) 5.6&#xa0;M with depth of 55&#xa0;km on 2 December 2023 near Ramganj, Bangladesh, occurred And created a widespread shaking and small-scale damages in various parts of Northeast India. Isoseismal lines of these earthquakes have been prepared using more than 200 crowdsource datasets and field survey in the different demographic spectrum of the area. These earthquakes have caused rupture of (1) 2.86% in Sylhet fault, (2) 19.70% in Cherdang fault, and (3) 4.98% in Gomati fault. This study highlights the significance of collecting extensive data on numerous faults in order to comprehend the current tectonics in various tectonic frameworks and to prepare for a better mitigation plan.</p>

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Macroseismic studies of three moderate earthquakes of 2023 in and around the Northeastern region of India and their environmental impacts

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Drishya Girishbai,
  • Arun Bhadran,
  • Sandipan Das,
  • Gaikungam Rongmei

摘要

The northeastern part of the Indian plate is undergoing a unique geological setting; two arcuated orogens such as collision And subduction meet in the extreme northeast corner to form the eastern syntaxial bend. Over the past 200 years, these plate boundaries have caused numerous strong And great earthquakes, and the comprehensive study that followed led to the creation of modern seismology. During 2023, three moderate magnitude earthquakes with shallow focus (1) A 5.4 M with 16 km depth on 14 August 2023 in Bangladesh, (2) A 5.2 M with depth of 10 km on 2 October 2023 near North Garo Hills, Meghalaya, and (3) 5.6 M with depth of 55 km on 2 December 2023 near Ramganj, Bangladesh, occurred And created a widespread shaking and small-scale damages in various parts of Northeast India. Isoseismal lines of these earthquakes have been prepared using more than 200 crowdsource datasets and field survey in the different demographic spectrum of the area. These earthquakes have caused rupture of (1) 2.86% in Sylhet fault, (2) 19.70% in Cherdang fault, and (3) 4.98% in Gomati fault. This study highlights the significance of collecting extensive data on numerous faults in order to comprehend the current tectonics in various tectonic frameworks and to prepare for a better mitigation plan.