Excavated slope for road construction, weak slope forming material, saturation of slope material and loss of cohesion during rainfall are the chief causative factors in inducing slope instability.
Nair,V,Athira., Jamir, I., 2022, Remote Sensing based Macro-scale (1:50,000) landslide susceptibility mapping in Toposheets82L/16, 82P/1,2,3,4,5,6 ; 83I/13,14 & 83M/01 covering  parts of West Siang East Siang, Upper Siang, Dibang Valley and Lower Dibang
Flowing drainage is observed on the left flank of the slide
West of Kolung Slide 1
NH-513
i.i.Removal of debris and hanging trees from the affected slope ii. Proper maintenance of hill side drain
"i.Slope forming material is composed of loose fragments of parent rock intermixed with soil ii . Rill erosion on the affected slope iii.Saturation of overburden and increase in pore pressure and loss of cohesion during rainfall.