The rock slide occurred due to the slope disturbance resulted due to the removal of overburden material for road construction.  The slope saturation increased during rain its results the pore water pressure and reduced the shear strength of the SFM.
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
From Khupa/ KVK Anjaw 12.1 kms along HMH road towards Hunli
Hunli-Metengliang-Hayuliang (HMH) road
1.Deep hillside lined ditches on toe of slope may be constructed for discharge of water. .Reducing the general slope by slope dressing may be considered. 3.Removal of protruded overburden and plants/ trees from the crown portion of the slide.
Extensive slope cut for road construction. Thick over burden material coupled with incessant rainfall as well as  oversaturation may cause for the slides.