The slide has occurred due to the slope disturbance. Prolonged percolation due to flowing drainage and rainwater along the closely spaced increased weathering and pore water pressure resulted in failure
Anicia K.S., Arvind Kumar Singh, 2022, Remote Sensing based Macro-scale (1:50,000) landslide susceptibility mapping in TS no. 82 P/12, 15, 16; 91 C/3, 4, 7, 8, 12; 91 D/1, 2, 3, 4, 5, 6, 8, 9 and 10 covering parts of Lower Dibang Valley, Lohit, Anjaw and
NIL
Tiwarigaon landslide. From Hunli 51.9 kms along NH-313 towards Anini
 NH-313 (Roing-Anini road)
1. Repairing of damaged retaining wall. 2. Proper diversion of flowing water from crown portion. 3. Provision for hill side road drainage. 4. Removal of loose material occurring at critical angle. 5. Removal of unstable plantation from the crown.
The SFM is made  highly weathered chlorite schist get oversaturated during the rain fall resulting the increased pore water pressure.