What are Hanging Glaciers?

A recent study published in the journal Nature has raised concerns over the growing instability of Himalayan glaciers due to rapid climate change, particularly in Uttarakhand.

The research, led by scientists from the Indian Institute of Science, Indian Institute of Technology Bhubaneswar, and Defence Geoinformatics Research Establishment, identified 219 unstable ice masses, known as “hanging glaciers,” in the Alaknanda basin.

What are Hanging Glaciers?

Hanging glaciers are ice bodies:

• Located on steep valley walls or hanging valleys
• Often detached from main (trunk) glaciers
• Prone to sudden break-offs, which can trigger avalanches, floods, or landslides

Key Findings

• The study presents a comprehensive inventory and classification framework for hanging glaciers in the Garhwal Himalaya
• These glaciers are increasingly unstable due to warming temperatures
• Their collapse can trigger cascading environmental disasters, including glacial lake outburst floods (GLOFs)

Geological and Climatic Factors

The Himalayan region lies along an active convergent plate boundary, making it:

• Seismically active
• Characterised by fractured and fragile bedrock

This creates a complex interaction between:

• Glacial processes
• Geological instability
• Climate change impacts

Together, these factors intensify the risks associated with hanging glaciers.

Rising Vulnerability

The study also highlights that:

• Rapid urbanisation in Himalayan regions has increased exposure of people and infrastructure
• Settlements downstream are particularly vulnerable to glacier-related hazards.