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<p>Our study focuses on assessing earthquake risks in the proposed Nusantara Capital City in Penajam Paser Utara Regency, East Kalimantan, Indonesia, emphasizing subsurface geology. We utilize gravity data extensively in urban planning to gain invaluable insights. Our meticulous data collection and processing techniques improve accuracy in mapping subsurface structures. Gravity anomaly analysis has been proven in many recent publications and ongoing researches to identify the subsurface density variation that may be interpreted as basement geometry of a basin, lateral lithologic changes, and geologic structures including active faults. Gravity models depicting horst and graben structures in pre-Tertiary sediments suggest a complex subsurface environment that continues to impact disaster risk today. Understanding subsurface geologic structures’ orientation, depth, and specific properties can help mitigate the associated risks, especially in earthquake-prone regions. Notably, the thickness of Tertiary sediments varies from 1&#xa0;km in the west to 2.5&#xa0;km in the southeast of the study area. The Kutai Basin, above which the Penajam Paser Utara Regency is located, was selected as the site for Nusantara’s new capital and acts as a natural buffer zone.</p>

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Gravity mapping and subsurface geologic analysis for the new capital of Indonesia: insights into the Penajam Paser Utara Regency

  • 期刊论文

  • 发表日期：

    2025年4月7日

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  • Subagio,
  • Tumpal B. Nainggolan,
  • Dida Kusnida,
  • Eddy Mirnanda,
  • Mohamad Ervan,
  • Budi Setyanta

摘要

Our study focuses on assessing earthquake risks in the proposed Nusantara Capital City in Penajam Paser Utara Regency, East Kalimantan, Indonesia, emphasizing subsurface geology. We utilize gravity data extensively in urban planning to gain invaluable insights. Our meticulous data collection and processing techniques improve accuracy in mapping subsurface structures. Gravity anomaly analysis has been proven in many recent publications and ongoing researches to identify the subsurface density variation that may be interpreted as basement geometry of a basin, lateral lithologic changes, and geologic structures including active faults. Gravity models depicting horst and graben structures in pre-Tertiary sediments suggest a complex subsurface environment that continues to impact disaster risk today. Understanding subsurface geologic structures’ orientation, depth, and specific properties can help mitigate the associated risks, especially in earthquake-prone regions. Notably, the thickness of Tertiary sediments varies from 1 km in the west to 2.5 km in the southeast of the study area. The Kutai Basin, above which the Penajam Paser Utara Regency is located, was selected as the site for Nusantara’s new capital and acts as a natural buffer zone.