The debris slide occurred due to Increase pore water pressure in the slope forming material due to blockage of natural nala for road construction. The SFM (weathered shale and 4m thick top soil) is unstable along the extensive slope cut.
Ramesh Guguloth, Neethu Alpho Joseph, 2022, Remote Sensing based Macro-scale (1:50,000) landslide susceptibility mapping in Toposheets 83M/4, 8,12,15,16; 83N/01, 2, 5, 6, 9,13; 92A/03, 4, 6, 7, 11,14,15,16; 92E/02, 3 & 4 covering  parts of Tirap, Changan
NIL
200m S of Rangran
Changlang-New Changalang road
Draining out of water logged observe on the left side of the hill side drain. 2. Extension of at least 3 m long of the already constructed retaining wall with sufficient weep holes.
The thick (4m)  slope forming material got oversaturated during heavy rainfall which increased the pore water pressure thereby,  reduced the shear strength of the slope forming material.