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26 July 2026

Landslide in Sikkim's Namchi district

The topic provides relevant case study material on the intersection of Himalayan fragility, infrastructure development, and disaster management, which can be used to substantiate answers on environmental degradation and disaster mitigation.

2 min read Day 4 of 4 2 questions 2 prelims

Notes

  • Recent incidents in Namchi district, Sikkim, include a landslide killing 2 workers and a separate tunnel explosion at the Teesta Stage VI Hydropower Project.
  • The Teesta Stage VI tunnel explosion resulted in 25 fatalities, attributed to the sudden release of methane gas trapped in rock formations.
  • Methane in hilly terrains occurs in porous rocks, anaerobic waterlogged soils, or near coal-bearing strata and fault lines.
  • Sikkim is located in the Rangit Tectonic Window zone; Geological Survey of India identified approximately 1.40 lakh tonnes of coal reserves in southern Sikkim.
  • Himalayan fragility is driven by young geological age, active tectonic instability, and the collision of Indian and Eurasian plates.
  • Anthropogenic factors exacerbating geological instability include heavy blasting for infrastructure, deforestation, unregulated urban expansion, and poor waste management.
  • Sikkim faces recurring climate-related disasters, including glacial lake outburst floods (GLOFs) and extreme weather events.
  • Standard tunnel project surveys (topographical, geotechnical, geophysical, etc.) are currently unable to detect odourless and colourless methane gas pockets.

Part of a longer story

This is day 4 of 4 in Teesta Stage-VI Hydroelectric Project tunnel disaster, which has been running since 22 July 2026. Reading it whole is usually worth more than reading today alone — the exam asks how something developed.

Questions

  1. The Himalayan region is increasingly vulnerable to both natural and anthropogenic disasters. Discuss the geological and human-induced factors contributing to the rising frequency of landslides and tunnel-related accidents in this region. 150 words
    Attempt this — 150 words in 8 min
    0 / 150 words 8:00
  2. Infrastructure development in fragile ecosystems like the Himalayas necessitates a paradigm shift in risk assessment and disaster management. In light of recent industrial accidents in Sikkim, evaluate the limitations of current geotechnical survey protocols and suggest measures to enhance worker safety in large-scale hydropower projects. 250 words
    Attempt this — 250 words in 11 min
    0 / 250 words 11:00

Prelims

  1. Which of the following geological zones in Sikkim is noted for the presence of coal reserves, which can be associated with methane gas pockets?

  2. Why is the detection of methane gas in tunnel construction projects in the Himalayan region particularly challenging?

Syllabus

Topics

Sources

250words.in · https://250words.in/daily/2026-07-26/landslide-in-sikkim-s-namchi-district