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Multi-sensor-based rock glacier detection over Sikkim Himalaya.

Ajay Kumar1, Apoorva Malviya2, Gulab Singh1

  • 1Indian Institute of Technology Bombay, Mumbai, India.

Iscience
|June 17, 2026
PubMed
Summary

This study mapped 626 active rock glaciers in Sikkim, Eastern Himalaya using satellite radar data. This research enhances understanding of these ice-storing landforms and their role in mountain water resources.

Keywords:
Earth sciencesEnvironmental scienceGlacial landscapes

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Area of Science:

  • Geomorphology
  • Glaciology
  • Remote Sensing

Background:

  • Rock glaciers store subsurface ice and influence mountain hydrology.
  • Limited data exists on rock glacier distribution in the Eastern Himalaya.

Purpose of the Study:

  • To map rock glaciers in Sikkim, Eastern Himalaya.
  • To assess the effectiveness of InSAR techniques for rock glacier detection.

Main Methods:

  • Utilized Sentinel-1 small baseline subset (SBAS) InSAR time series (2022-2024).
  • Applied seasonal-trend decomposition using LOESS (STL) for signal enhancement.
  • Validated findings with optical imagery and Google Earth Pro.

Main Results:

  • Identified 626 active rock glaciers in Sikkim.
  • Measured line-of-sight displacement rates ranging from -500 to +600 mm yr-1.
  • Confirmed millimeter-level stability at reference sites.

Conclusions:

  • The study refines existing rock glacier estimates for Sikkim.
  • SBAS InSAR with STL filtering is effective for rock glacier detection and cryosphere assessment in the Eastern Himalaya.