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Abstract <p>Despite its complex tectonic framework, intense seismicity, and hydrocarbon potential, the Arunachal Himalayan foreland remains poorly characterised by geophysical investigations. This study presents results from a three-dimensional inversion of magnetotelluric data acquired along a profile across its westernmost sector, resolving a pronounced layered resistivity structure. A conductive sedimentary wedge, interpreted as Siwalik molasse and Quaternary deposits, is ~0.5 km thick beneath the Brahmaputra plains and thickens northward to ~5.5 km beneath the mapped trace of the Himalayan Frontal Thrust, reaching ~6–7&#xa0;km further north. Beneath it, a ~13 km thick resistive crustal layer dips northward and overlies a moderately conductive deeper zone. Constrained by passive-seismic velocity models, this resistivity framework indicates a dry, brittle upper crust above a more conductive layer whose nature requires further clarification. These results provide the first geoelectrical constraints in this segment of the foreland, offering new structural information relevant to regional seismicity and guiding future deep geophysical investigations and exploration efforts.</p>

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Electrical Resistivity Structure of the Western Arunachal Himalayan Foreland Derived from 3D Inversion of Magnetotelluric Profile Data1

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • I. N. Lozovsky,
  • Iv. M. Varentsov,
  • D. Walia,
  • S. P. Baryshnikov,
  • P. V. Ivanov,
  • S. G. Gokarn,
  • S. S. Sanabam,
  • N. K. Bori

摘要

Abstract

Despite its complex tectonic framework, intense seismicity, and hydrocarbon potential, the Arunachal Himalayan foreland remains poorly characterised by geophysical investigations. This study presents results from a three-dimensional inversion of magnetotelluric data acquired along a profile across its westernmost sector, resolving a pronounced layered resistivity structure. A conductive sedimentary wedge, interpreted as Siwalik molasse and Quaternary deposits, is ~0.5 km thick beneath the Brahmaputra plains and thickens northward to ~5.5 km beneath the mapped trace of the Himalayan Frontal Thrust, reaching ~6–7 km further north. Beneath it, a ~13 km thick resistive crustal layer dips northward and overlies a moderately conductive deeper zone. Constrained by passive-seismic velocity models, this resistivity framework indicates a dry, brittle upper crust above a more conductive layer whose nature requires further clarification. These results provide the first geoelectrical constraints in this segment of the foreland, offering new structural information relevant to regional seismicity and guiding future deep geophysical investigations and exploration efforts.