The deep rotational debris slide occurred due to increase pore water pressure in the slope forming material. This reduced the shear strength of SFM and the material slided.
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
Debris slide along the Longding-Khonsa road sector.
500 m E of Lapnan
Longding-Khonsa road
1. Removal of slided debris material from the drainage. 2.  Reconstruction of damaged concrete wall with sufficient weep holes.
1. Increased pore water pressure in the slope forming material due to oversaturation during heavy rainfall and thereby reduces the shear strength of SFM.