Hanging Glaciers in the Himalayas

Why in News?

Rising temperatures and changing precipitation patterns are destabilising Himalayan glaciers, increasing the risk of glacier collapse, avalanches and downstream hazards. An April 2026 study published in Nature identified 219 hanging glaciers in the Alaknanda Basin of the Garhwal Himalayas, highlighting their growing hazard potential.

What are Hanging Glaciers?

Hanging glaciers are masses of ice located on steep mountain slopes, often detached from the main glacier system. Because of their unstable position, they can suddenly break off and trigger ice and rock avalanches.

Formation of Hanging Glaciers

Rapid warming, glacier retreat and climate variability can reduce the structural stability of glaciers. These processes result in redistribution of ice, changes in glacier geometry and the development of unstable hanging-ice formations.

Global Context

Hanging glaciers have been extensively studied in the Alps, whereas basin-scale assessments in the Himalayas remain relatively limited because of difficult terrain and inadequate long-term monitoring.

Risks Associated with Hanging Glacier Collapse

Avalanche Hazards

The sudden break-off of a hanging glacier can generate a massive ice avalanche. Simulations indicate that avalanche flows in the Badrinath–Mana sector of Uttarakhand could exceed 50 metres in height, posing risks to settlements and infrastructure.

Glacial Lake Outburst Floods

Glacier collapse can also generate secondary hazards such as Glacial Lake Outburst Floods (GLOFs). A GLOF occurs when water stored in a glacial lake is suddenly released, producing a potentially destructive flood downstream.

Cascading Hazards

A collapsing glacier can carry rocks, snow and sediments downslope. This can produce compound or cascading hazards, including debris flows, river blockages and sudden floods.

Threat to Infrastructure

Himalayan valleys containing hydropower projects, roads, bridges, settlements and pilgrimage routes are particularly vulnerable to glacier-related hazards.

Study on Hanging Glaciers in the Alaknanda Basin

An April 2026 study published in Nature identified 219 hanging glaciers in the Alaknanda Basin of the Garhwal Himalayas.

Nearly one-third of the unstable hanging ice mass is concentrated in the Upper Alaknanda Basin, increasing the potential risk to downstream settlements and infrastructure.

The study also projected a significant increase in exposure to avalanche-related hazards. By 2030, around 120% more buildings and infrastructure land area could be at risk compared with 2000.

The population living in these risk-prone areas is projected to increase by approximately 17% over the same period, potentially increasing disaster vulnerability.