2 set of joint intersecting at a near perpendicular angle with each other forming a wedge. In addition weathering and percolation of surface water along weak planes leads to the widening of the joint aperture resulti detachment of blocks.
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
 Hunli landslide. From Mayudia Pass 27.6 kms along NH-313 towards Hunli
 NH-313 (Roing-Anini road)
The rock slide has occurred due to the wedge failure, percolation of rainwater through joint plane makes the condition more adverse for failure. The slide is presently active and rock blocks detaches and fall frequently.
1. The highly jointed quartzite dissected by 4 sets of joints. 2. Formation of wedge by intersection of joints. 3. Percolation of rainwater through joint plane make the condition more adverse for failure.