"The Himalayas are highly prone to landslides."Discuss the causes and suggest suitable measures of mitigation.

Why the Himalayas are so prone

• The range is geologically young; the Indian plate still pushes under Eurasia, so rocks are crushed, folded, and cut by thrusts such as the Main Boundary Thrust and the Main Central Thrust.
• Slopes are steep, valleys are deep, and gravity is always ready to pull debris once a trigger comes.
• Many slopes are made of fractured sedimentary and metamorphic rocks, old landslide debris, and glacial till that lose strength when wet.
• The monsoon and cloudbursts deliver intense rain in a short time, raising pore-water pressure and turning soil into a flow, as seen in Kedarnath (2013) and later hill disasters.
• The belt is seismic; shaking from Himalayan earthquakes loosens slopes and can start slides during or after the event.
• Rivers undercut toes of slopes, and glacial lake outburst floods can strip valleys in hours.

Human causes that raise the risk

• Hill roads, often cut without proper benches, drains, or disposal of spoil, remove the toe of the slope and load the downhill side.
• Hydropower tunnels, blasting, and unplanned construction on old slide fans put buildings on unsafe ground.
• Deforestation, road-edge grazing, and slope farming without terraces reduce root strength and increase runoff.
• Encroachment on floodways and debris fans, plus tourism load in pilgrimage towns, puts more people in the path of the next slide.

Mitigation measures

• Map landslide hazard at large scale through the Geological Survey of India, state disaster authorities, and NDMA guidelines, and ban construction on very high-hazard slopes.
• Design hill roads with controlled blasting, retaining walls, catch drains, and safe dumping of muck, not a vertical cut and a heap on the riverbank.
• Use bio-engineering: grass, shrubs, and trees on cuts, plus check dams and contour drains to slow water.
• Early warning from rainfall thresholds, slope instruments, and community watch in monsoon weeks, linked to NDMA and state control rooms.
• Catchment treatment, restricted hydropower in fragile belts, and honest environmental clearance that treats landslide as a design input, not a footnote.
• Relocate chronic slide villages where repair is cheaper than risk; insure and train local masons in safer hill building.
• Keep pilgrimage and tourist numbers within the carrying capacity of towns such as those on the Char Dham routes.
• After a slide, drain the scarp, remove hanging blocks, and do not rebuild on the same debris without geotechnical sign-off.

Way forward for the answer

• Join plate tectonics, rain, and earthquakes with roads and hydropower, then list mapping, better cuts, bio-engineering, and early warning as mitigation.