Differentiate the causes of landslides in the Himalayan region and Western Ghats. (UPSC 2021, 10 Marks, )

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Landslides are geological hazards that pose a significant threat to various regions globally. The Himalayas and the Western Ghats, both prominent mountain ranges in India, exhibit different frequencies of landslide occurrences. However, landslides are more frequent in the Himalayas as compared to the Western Ghats.

Causes of Landslides in the Himalayan region vs the Western Ghats

Aspect	Himalayan Region	Western Ghats
Geological Characteristics	Young and actively rising mountains	Older, more stable geological features
Tectonic Activity	High seismicity and ongoing tectonic processes	Lower seismic activity, more stable tectonics
Main Triggering Factors	Tectonic activity, seismic events	Intense rainfall, tropical cyclones
Lithology	Loose and fragmented rocks	Weathered and less consolidated rocks. Varied lithology with more resistant rocks.
Slope Gradient	Steeper slopes in many areas	Generally gentler slopes
Glacial Activities	Glacial activities contributing to instability	Absence of glacial activities
Vegetation Cover	Sparse vegetation at higher altitudes	Dense and diverse vegetation cover
Human Activities	Deforestation, road construction	Agriculture, urbanization
Land Use Patterns	Limited agriculture at high altitudes	Extensive agriculture and settlements
Previous History of Landslides	History of catastrophic landslides	Frequent but generally smaller events
Risk and Vulnerability	High risk due to rapid terrain changes	Moderate risk, but localized impact
Preventive Measures	Structural interventions, early warning systems	Afforestation, land-use planning

The frequency of landslides in the Himalayas is influenced by a combination of tectonic, geological, and environmental factors. The Western Ghats, with their older geological formations and less dynamic geological processes, experience fewer landslides.

Understanding these distinctions is crucial for implementing effective mitigation strategies in both regions, considering the potential consequences on human settlements and the environment.