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Abstract <p>We study active tectonic features of the Dikhow River Basin, lying within the Naga–Patkai Range and Upper Assam plains of the Brahmaputra Valley, India, by using geomorphic and seismotectonic analyses. To better understand the tectonic evolution, we analysed 47 sub-basins within the Dikhow catchment using a suite of geomorphic indices, including the asymmetry factor (AF), basin shape index (BS), stream length-gradient index (SL), hypsometric integral (HI), valley floor width-to-height ratio (Vf) culminating in the composite index of relative active tectonics (IRAT), alongside mountain front sinuosity (Smf) and normalised steepness index (<i>K</i><sub>sn</sub>). Our results indicate that the Dikhow Basin experiences high to very high tectonic activity based on the index of relative active tectonics (IRAT) values. Occurrence of a significant number of earthquakes within the basin area also supports tectonically active status of the area. Results obtained from the waveform inversion on selected earthquake events within the region indicate right-lateral strike–slip faulting and thrust faulting with oblique slip in the Naga–Patkai Range region. Field observations confirm ongoing neotectonic deformations within the study area. By integrating geomorphic and seismotectonic data, we provide a comprehensive understanding of the geodynamic forces shaping this tectonically active landscape.</p> Research highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>We assessed the spatial variation of relative tectonic activity within the Dikhow River basin at sub-basin level.</p> </ItemContent> <ItemContent> <p>Analysis of AF, SL, HI, Vf, and IRAT exhibits high tectonic activity in the upstream reaches of the Dikhow catchment, consistent with the Naga–Patkai orogeny.</p> </ItemContent> <ItemContent> <p>Very high to high <i>K</i><sub>sn</sub> values are detected in the hilly portions of the study area.</p> </ItemContent> <ItemContent> <p>Waveform inversion primarily exhibits right lateral strike–slip and thrust faulting.</p> </ItemContent> </UnorderedList></p>

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Integrated assessment of active tectonics using geomorphic and seismotectonic approaches: a case study of the Dikhow River Basin, North East India

  • 期刊论文

  • 发表日期：

    2026年7月22日

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  • Anwesha Dutta Hazarika,
  • Devika Maisnam,
  • Devojit Bezbaruah,
  • Manoj Kr Phukan

摘要

Abstract

We study active tectonic features of the Dikhow River Basin, lying within the Naga–Patkai Range and Upper Assam plains of the Brahmaputra Valley, India, by using geomorphic and seismotectonic analyses. To better understand the tectonic evolution, we analysed 47 sub-basins within the Dikhow catchment using a suite of geomorphic indices, including the asymmetry factor (AF), basin shape index (BS), stream length-gradient index (SL), hypsometric integral (HI), valley floor width-to-height ratio (Vf) culminating in the composite index of relative active tectonics (IRAT), alongside mountain front sinuosity (Smf) and normalised steepness index (Ksn). Our results indicate that the Dikhow Basin experiences high to very high tectonic activity based on the index of relative active tectonics (IRAT) values. Occurrence of a significant number of earthquakes within the basin area also supports tectonically active status of the area. Results obtained from the waveform inversion on selected earthquake events within the region indicate right-lateral strike–slip faulting and thrust faulting with oblique slip in the Naga–Patkai Range region. Field observations confirm ongoing neotectonic deformations within the study area. By integrating geomorphic and seismotectonic data, we provide a comprehensive understanding of the geodynamic forces shaping this tectonically active landscape.

Research highlights

We assessed the spatial variation of relative tectonic activity within the Dikhow River basin at sub-basin level.

Analysis of AF, SL, HI, Vf, and IRAT exhibits high tectonic activity in the upstream reaches of the Dikhow catchment, consistent with the Naga–Patkai orogeny.

Very high to high Ksn values are detected in the hilly portions of the study area.

Waveform inversion primarily exhibits right lateral strike–slip and thrust faulting.