Geography • Physical GeographyMedium
What is the primary geomorphic process responsible for the frequent catastrophic landslides observed along the highway corridors of Arunachal Pradesh during the monsoon season?
A. Saturative pore-water pressure increase combined with steep slope angles and fragile rock strata✓ Correct Answer
B. Widespread tectonic subduction earthquakes occurring daily along the Main Boundary Thrust
C. Glacial plucking and basal sliding of high-altitude ice sheets during summer melts
D. Chemical weathering caused by acid rain dissolving limestone bedrock formations
💡 Solution & Explanation
Monsoon landslides in Arunachal Pradesh are primarily triggered when intense rainfall infiltrates weathered rock and soil, drastically increasing pore-water pressure and reducing the shear strength of slopes composed of fragile tertiary sedimentary strata. While tectonic activity contributes to overall rock fracturing, daily earthquakes are not the direct seasonal trigger. Glacial activity is restricted to extreme high altitudes, and extensive limestone dissolution is not the primary lithology of these specific slide-prone zones. Mitigating these hazards requires advanced slope stabilization and bio-engineering techniques.
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