UPSC Notes

Himalayan Geodisasters

PYQs

5

Articles

1

Momentum

15

Phase IFoundation

Background

Overview

India shares the geologically active and fragile Himalayan region, making it highly vulnerable to similar geodisasters. Understanding the scientific mechanisms of these hazards is crucial for effective disaster risk reduction, infrastructure planning, and ensuring the safety and resilience of mountain communities. The increasing frequency and intensity of such events, potentially linked to climate change, highlight their significance for national development and environmental policy.

The Himalayas, a young and tectonically active mountain range, are highly susceptible to various geohazards including landslides, avalanches, and flash floods. These events are often triggered by complex interactions of geological instability, seismic activity, and extreme weather, posing significant risks to human settlements and infrastructure.

Phase IIStatic core

Facts & tables

Key facts

Sturzstrom Definition

A sturzstrom is a massive rock avalanche in which a large volume of rock suddenly collapses and moves at extremely high speed over a long distance, often incorporating ice, snow, firn, and frozen soil in high-mountain environments.

Mechanism

Pressure and friction within a sturzstrom can generate meltwater, which increases lubrication and reduces resistance, contributing to exceptionally long runout distances.

Recent Examples

The 2026 Bhotekoshi flood in Nepal and the 2021 Chamoli disaster in Uttarakhand, India, are scientifically described as rock-ice avalanches or sturzstroms.

Climate Change Link

Rising temperatures in the Himalayas are causing glaciers to melt faster and permafrost to thaw, potentially exacerbating slope instability and increasing the likelihood of such geodisasters.

Reference table

Static syllabus anchors

TypeReference
Conceptual areaDisaster Management
Conceptual areaPhysical Geography
Conceptual areaEnvironment & Ecology

Reference table

Institutions & roles

BodyRole
National Disaster Management Authority (NDMA)Formulates policies and guidelines for disaster management in india
Geological Survey of India (GSI)Conducts geological mapping and hazard assessment
UN Office for Disaster Risk Reduction (UNDRR)Advocates for disaster risk reduction globally and supports national efforts
Phase IIIExam lens

Prelims angle

Overview

Prelims angle: Multi-statement analysis

Prelims angle: Conceptual understanding

Quick revision

  • Himalayas prone to geohazards like sturzstroms (rock-ice avalanches).
  • Sturzstroms involve rapid, long-distance movement of rock, ice, snow.
  • Bhotekoshi (Nepal) and Chamoli (India) are recent examples.
  • Climate change (glacier melt, permafrost thaw) contributes to instability.
  • Crucial for disaster management and infrastructure planning in mountain regions.

High-confidence PYQs

Topic timeline

Disaster ManagementPhysical GeographyEnvironment & Ecology

The Bhotekoshi flood | A Himalayan tragedy

30 Aug 2026 · Himalayan geodisasters like sturzstroms (massive rock-ice avalanches) are a major threat in the tectonically active and climate-sensitive Himalayas, exemplified by the Bhotekoshi and Chamoli floods.

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Related topics

Practice writing on this topic

UPSC has asked 5 linked questions on Himalayan Geodisasters in Mains. Write an answer to one — and get it evaluated.

UPSC Prelims PYQs on Himalayan Geodisasters

Practice official previous year questions asked by UPSC related to this concept.

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