Piping due to surface and subsurface water caused development of pore pressure leading to subsidence of the ground. Gully  erosion also played an important role. 

An interim report on Preliminary slope stability assessment of recent disaster affected areas of Pithoragarh District, Uttarakhand by A Bishwapriya, Suptg. Geologist, M V Dhakate and P K Gajbaiye, Sr Geologist, M IV, NR,Dehradun (LHZ/NR/UPUK/2013/056)
High subsidence catalyzed by recent heavy downpour .Adjoining nala contributing significantly to the saturation of the slope mass
UK/Pith/Munsyari-Milam/Vil/SZ/0014
Dhapa village
The slope bearing settlements is subsiding at a brisk rate and therefore the people need to be rehabilitated at a safer location without delay.
The major triggering factors are subsidence/creeping of the ground due to saturation of loose and unconsolidated mass and piping due to surface and subsurface water under continuous heavy rainfall for 3-4 days (130 mm/day and gully erosion